Peptides are only as good as the thinking behind them.

Science Overview · V3.1

Why a 10-ingredient 4% SYN-AKE® system can visibly refine expression lines in weeks, and keep building skin quality after that.

The problem: lines your face keeps rehearsing

Every time you raise your brows, squint at a screen, or smile for a photo, the same facial muscles pull the same tracks into your skin. Over time, those practice lines can become more visible, even when your face is at rest.

• Horizontal forehead lines
• Vertical 11 lines between the brows
• Crow’s feet at the outer corners of the eyes
• Early expression-related lines

A basic moisturizer can soften dryness. But hydration alone does not address the repeated movement that keeps creasing the same lines in the first place.

One focus: dynamic expression lines

REFINE is not a generic anti-aging cocktail. It is built around one specific job: visibly refine movement-driven wrinkles on the forehead, the 11s and crow’s feet, with a routine you can actually live with.

The core active is SYN-AKE®, a small neuromodulating peptide modeled on a neuromuscular signaling sequence found in temple viper venom. In laboratory and supplier research it interacts with the muscular nicotinic acetylcholine receptor, one of the receptors involved when nerves signal facial muscles to contract.

REFINE uses SYN-AKE® at 4%, the maximum supplier-recommended use level and the same concentration used in the best-known 28-day studies on crow’s feet and forehead wrinkles.

What neuromodulation means for your skin

Think of a facial muscle’s “contract now” message like a key opening a door. Your nerve releases acetylcholine, the key, which fits into a receptor on the muscle, the lock, and signals the muscle to contract.

SYN-AKE® temporarily occupies part of that lock. In laboratory systems, that means fewer “contract now” messages get through at full strength.

Your face still moves, smiles and makes expressions. It just does not have to crease the same lines as intensely, over and over.

Every expression is a repetition. REFINE’s 4% SYN-AKE® system helps soften that repeated crease-making action, so the lines you keep creating all day are not being pressed as deeply into the skin while you use it.

What the research shows

SYN-AKE® 4%: movement-driven wrinkles

In manufacturer-run studies of creams with 4% SYN-AKE®, applied twice daily for 28 days, researchers measured dynamic wrinkles on crow’s feet and forehead. They saw:

• Up to 52% reduction in measured wrinkle depth in the best responders
• About 21% smoother skin surface and 15 to 20% shallower wrinkle-depth parameters on average
• Smoothing in approximately 80% of volunteers, and wrinkle-depth reduction in roughly 70 to 75%
• Early change beginning around days 7 to 14, with the central evaluation point at four weeks

REFINE is built around the same 4% SYN-AKE® concentration and twice-daily, 28-day use model as these ingredient studies.

Hyaluronic acid: hydration that visibly softens fine lines

In a six-week study of a facial hyaluronic acid serum, skin hydration increased 134% immediately after application. By week six, participants saw approximately 31% improvement in fine lines and approximately 14% improvement in wrinkles.

Hyaluronic acid helps more than skin feel hydrated. With regular use, it helps fine lines and shallow wrinkles look less dry, less collapsed and more smoothed out.

Niacinamide: the long-game ingredient

Niacinamide is what gives REFINE more to offer after the first expression-line checkpoint.

In a double-blind, randomized split-face study of 50 women with facial photoaging, twice-daily topical 5% niacinamide improved the appearance of fine lines and wrinkles, texture, elasticity, hyperpigmented spots, red blotchiness and sallowness over 12 weeks.

It also supports the skin barrier. Topical nicotinamide has been associated with increased synthesis of ceramides, free fatty acids and cholesterol in the stratum corneum, together with lower water loss through the skin surface in dry skin.

The simple version: glycerin and hyaluronic acid help put hydration into the surface; niacinamide helps the skin hold on to it. Over continued use, it adds a smoother-looking, more even, more elastic, more resilient-looking skin-quality story.

Glycerin: hydration that stays comfortable

Glycerin is a well-studied humectant that helps draw and hold water in the outer layers of skin. Human studies show faster barrier recovery after skin challenge, with higher hydration and lower water loss than comparison formulas.

That matters in constantly moving areas such as the forehead and eye contour: glycerin helps the surface stay more comfortable, supple and less rough-looking while the rest of the routine does its work.

Four layers. One expression-line system.

A wrinkle does not show up for only one reason. It reflects repeated movement, the way skin folds at the surface, how hydrated that surface is, and how resilient the surrounding skin looks. REFINE is built to support all four, not by piling on ingredients, but by giving every ingredient a defined job.

Layer	Ingredients	What it does
Expression-line focus	4% SYN-AKE®	Targets the visible impact of repeated facial movement in forehead lines, the 11s and crow’s feet, at the maximum supplier-recommended use level
Immediate hydration	Glycerin, sodium hyaluronate	Hydrate and visibly soften the surface, so fine lines look less dry and less sharply carved
Retention and skin quality	Niacinamide	Supports the lipid-rich barrier that helps retain hydration, and the longer-horizon appearance of fine lines, texture, elasticity and tone
Conditioning and daily use	Tocopheryl acetate, zinc oxide, guar gum, water, preservation system	Support a clear, lightweight, stable serum that spreads easily and fits a twice-daily routine

10 ingredients. One system. Every ingredient has a job. SYN-AKE® centers the routine on expression lines. Glycerin and hyaluronic acid soften the surface. Niacinamide helps skin retain hydration and develop a more resilient-looking barrier over time. The supporting system makes it all easy to use, morning and night.

28 days is the on-ramp

REFINE is designed to build in layers. The first four weeks are the expression-line proof point; the weeks after that are where the rest of the system keeps earning its place.

Days 1 to 2 · my skin looks less dry and drawn

• Glycerin and hyaluronic acid begin increasing surface hydration quickly. In the hyaluronic acid study, hydration more than doubled immediately after application.
• Fine lines, especially around the eyes, can look less chalky, less sharply carved and more softened at the surface.
• Skin feels more supple, and makeup can apply more smoothly.

Days 7 to 14 · my moving lines are not as intense

• In 4% SYN-AKE® research, early changes in dynamic crow’s-feet and forehead lines were observed around the first one to two weeks.
• At the same time, glycerin, hyaluronic acid and niacinamide support a more hydrated, comfortable surface and a stronger moisture-retention routine.

Day 28 · my forehead, 11s and crow’s feet look different in photos

• In 28-day trials with 4% SYN-AKE®, dynamic-wrinkle depth and roughness improved by approximately 20% on average, with some participants reaching up to 52% depth reduction.
• The hydration system continues supporting smoother, more plump-looking skin while niacinamide reinforces moisture retention and its longer-horizon skin-quality role.

Day 28 is your expression-line checkpoint. Compare your forehead lines, the 11s and crow’s feet at rest and in motion in the same light. This is when the difference is easiest to judge side by side.

Weeks 6 to 12 · the whole area looks better

• Hyaluronic acid studies show hydration and line appearance still improving at week six, including 31% improvement in fine lines and 14% improvement in wrinkles in one facial-serum study.
• Controlled niacinamide research showed visible improvements in fine lines and wrinkles, texture, elasticity, tone, blotchiness and sallowness over 8 to 12 weeks.
• Continued use is expected to maintain the routine’s hydration, barrier and expression-line-focused cosmetic support. As with topical neuromodulating peptides, the expression-line benefit is maintained through consistent use rather than becoming permanent.

The science behind the system

REFINE is built around the ingredient systems cited throughout this overview: 4% SYN-AKE® for expression-line-focused care; glycerin and sodium hyaluronate for hydration and surface refinement; niacinamide for barrier and longer-horizon visible skin-quality support; and a purposeful supporting formula architecture for a clear, lightweight serum experience.

For the complete mechanisms, ingredient research, evidence discussion and technical context, read the Technical White Paper V2.4 →

Technical White Paper · V2.4

4% SYN-AKE® peptide, niacinamide, hyaluronic acid and glycerin for targeted, stacking expression-line refinement.

Abstract

REGENYX REFINE is a clear, lightweight, leave-on cosmetic serum formulated to visibly refine dynamic facial wrinkles: the lines formed by everyday expressions such as squinting, smiling and raising the brows. It combines 4% SYN-AKE®, the maximum supplier-recommended use level and the concentration used in the referenced 28-day ingredient studies, with a meaningful proprietary level of niacinamide, clinically characterized humectants (glycerin and sodium hyaluronate), tocopheryl acetate and a purposeful supporting formula system.

In manufacturer-run clinical studies, a cream containing 4% SYN-AKE® applied twice daily for 28 days produced measurable reductions in dynamic wrinkle parameters on crow’s feet and forehead: mean skin roughness (Ra) decreased by about 21%, mean wrinkle-depth parameters (Rz, Rt) decreased by 15 to 20%, and individual forehead wrinkle-depth reductions reached up to 52% in the best responders. Smoothing effects were detected in approximately 80% of volunteers, and wrinkle-depth reductions in roughly 70 to 75%, with early visible changes emerging after one to two weeks of consistent use.

Clinical trials of topical hyaluronic acid serums report an immediate 134% increase in hydration, approximately 55% higher hydration at six weeks, and improvements of approximately 31% in fine lines and 14% in wrinkles after six weeks of daily use. Glycerin has repeatedly been shown to improve hydration and support barrier recovery, including lower transepidermal water loss (TEWL) in challenged skin. Controlled niacinamide research supports improvements in the appearance of fine lines and wrinkles, elasticity, texture, uneven tone, blotchiness and sallowness, while barrier studies associate topical nicotinamide with increased synthesis of key stratum-corneum lipids and lower TEWL.

Glycerin and sodium hyaluronate deliver hydration at the surface; niacinamide supports the barrier that helps retain it while contributing longer-horizon visible skin-quality benefits. Together, the ten ingredients form one intentional, daily expression-line system.

1 · Problem and context: dynamic lines in a cosmetic gap

Dynamic expression lines, forehead creases, glabellar 11 lines and crow’s feet, form along the same skin folds every time underlying facial muscles contract to raise the brows, squint or smile. Over years of repeated movement, these dynamic lines can imprint into the skin and become more visible even at rest.

Traditional cosmetic options tend to address only part of this picture:

• Generic moisturizers and broad multi-peptide blends may improve hydration and texture, but they are not necessarily designed around the biology of movement-associated expression lines and often do not disclose active concentrations.
• Injectable neuromodulators require a medical procedure and produce pharmacological chemodenervation of target muscles; that is categorically different from cosmetic topical care.

REFINE is designed for the cosmetic space between those categories: a non-injectable, daily expression-line serum centered on a maximum-use-level neuromodulating peptide, then supported by hydration, barrier, skin-quality and conditioning ingredients.

2 · Evidence snapshot

2.1 SYN-AKE® 4%: neuromodulating peptide

Manufacturer-run ingredient studies of creams containing 4% SYN-AKE®, applied twice daily for 28 days to crow’s feet and forehead, reported:

• Up to 52% reduction in measured forehead wrinkle depth in best responders after four weeks.
• Approximately 21% reduction in surface roughness (Ra) and 15 to 20% reduction in wrinkle-depth parameters (Rz, Rt).
• Measurable smoothing in roughly 80% of participants and measurable wrinkle-depth reduction in approximately 70 to 75%.
• Early softening in some users from approximately day 7 to 14, with clearer and more consistent improvements by day 28.
• A twice-daily, 28-day regimen at 4% SYN-AKE®, the same concentration and use pattern used for REFINE.

2.2 Niacinamide: barrier, visible aging and skin quality

• In a double-blind, randomized, split-face study of 50 women with facial photoaging, 5% niacinamide used twice daily for 12 weeks significantly improved fine lines and wrinkles, hyperpigmented spots, red blotchiness, yellowing or sallowness, texture and measured elasticity compared with vehicle.
• In keratinocyte and dry-skin research, nicotinamide increased synthesis of ceramides, free fatty acids and cholesterol, increased key stratum-corneum lipids after topical use, and reduced TEWL.
• Controlled clinical work also found decreased hyperpigmentation and increased skin lightness after four weeks of topical niacinamide use; mechanistic work indicates that niacinamide can reversibly reduce melanosome transfer to keratinocytes.
• Two randomized controlled 35-day studies of niacinamide and glycerin moisturizers found rapid and prolonged improvements in cosmetic xerosis and stratum-corneum integrity.

REFINE includes niacinamide as a major secondary active: a purposeful barrier and skin-quality complement to its expression-line peptide system.

2.3 Hydration and line appearance: sodium hyaluronate and glycerin

Clinical research on topical hyaluronic acid serums and multi-weight hyaluronic acid systems reports up to a 134% immediate increase in skin hydration by corneometry, approximately 55% higher hydration than baseline after six weeks of daily use, and approximately 31% improvement in fine lines and 14% improvement in wrinkles in a facial-serum study after six weeks.

Glycerin studies in normal and compromised skin show faster barrier recovery, higher hydration and lower TEWL following tape stripping or surfactant challenge compared with vehicle controls. In REFINE, glycerin is especially relevant because it is both a core humectant in the water-based system and part of the commercial SYN-AKE® carrier system.

2.4 Why REFINE is not a generic peptide serum

REFINE is organized around one documented hero concentration, 4% SYN-AKE®, rather than a broad, unquantified list of peptide names. Its ten ingredients were selected for distinct, complementary jobs: the peptide supplies the expression-line rationale; niacinamide supports barrier lipids, moisture retention and progressively improved visible skin quality; glycerin and sodium hyaluronate supply immediate hydration and line-softening support; tocopheryl acetate contributes skin-conditioning and antioxidant support; and zinc oxide with the functional base provides the vehicle, preservation and texture system that make the serum clear, lightweight, stable and practical for twice-daily use.

3 · Product overview

3.1 Identity and intended use

REGENYX REFINE is a clear, lightweight, fast-spreading cosmetic, leave-on peptide expression-line serum for adults who want to visibly soften and refine lines associated with everyday facial movement, particularly forehead expression lines, glabellar 11 lines, crow’s feet (lateral canthal lines), and smile-related expression lines and early perioral etching.

Directions are to apply 1 to 2 pumps to clean, dry facial skin, neck and other selected expression-prone areas morning and evening, then allow the product to absorb. Broad-spectrum sunscreen remains appropriate as the final daytime step in a complete routine.

3.2 Current production INCI

Water, Glycerin, Niacinamide, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Zinc Oxide, Tocopheryl Acetate, Phenoxyethanol, Ethylhexylglycerin, Sodium Hyaluronate, Cyamopsis Tetragonoloba (Guar) Gum.

3.3 Functional ingredient hierarchy

Priority	Ingredient or system	Primary role in REFINE
1 · Hero	4% SYN-AKE® · Dipeptide Diaminobutyroyl Benzylamide Diacetate	Expression-line-focused neuromodulating peptide rationale at the supplier’s maximum recommended use level.
2 · Supporting active	Niacinamide	Meaningful proprietary level above 1%; barrier-lipid support, moisture retention, and visible fine-line, elasticity, texture and tone rationale.
3 · Hydration system	Glycerin + sodium hyaluronate	Hydration, suppleness, surface plumping and the appearance of softened dehydration lines.
4 · Conditioning support	Tocopheryl acetate	Stable vitamin E skin-conditioning and antioxidant support.
5 · Formulation component	Zinc oxide	Multifunctional mineral component that supports the physical formula architecture.
6 · Integrity and texture	Water, phenoxyethanol, ethylhexylglycerin, guar gum	Aqueous vehicle, preservation, serum consistency and a clear, lightweight, spreadable application experience.

3.4 Purposeful formula architecture

REFINE is designed for complementary action. Each ingredient supports a different part of the visible expression-line picture rather than attempting to make every ingredient do the same thing. SYN-AKE® establishes the expression-line-specific focus by addressing the visible impact of repeated facial movement. Glycerin and sodium hyaluronate support immediate hydration and a smoother, more supple-looking surface. Niacinamide supports the lipid-rich barrier that helps retain hydration while contributing longer-horizon rationale for the appearance of improved texture, elasticity, fine lines and tone. Tocopheryl acetate adds stable conditioning and antioxidant support. Zinc oxide, guar gum, the aqueous vehicle and the preservation system provide the physical structure, clarity, spread, stability and everyday usability required for consistent application.

4 · Mechanistic rationale

4.1 Dynamic and static wrinkles

Dynamic expression wrinkles arise when underlying facial muscles repeatedly contract, such as when raising the brows, smiling or squinting. Over time, repeated folding can contribute to lines that persist at rest. Static lines also reflect broader changes in skin structure, hydration, photoexposure and tissue support. Neuromodulating cosmetic peptides are most relevant to the dynamic component; hydration, barrier support and broader skin-quality ingredients instead support the texture, moisture status and visible condition of the skin overlying expression-prone areas.

4.2 SYN-AKE®: expression-line neuromodulation

SYN-AKE® (INCI: Dipeptide Diaminobutyroyl Benzylamide Diacetate) is a short synthetic peptide designed around functional motifs of Waglerin-1, a peptide from Tropidolaemus wagleri venom that antagonizes the adult muscle-type nicotinic acetylcholine receptor (mnAChR).

In ingredient-level laboratory and supplier documentation, SYN-AKE® is described as a reversible competitive antagonist at the muscular nicotinic acetylcholine receptor. It competes with acetylcholine at the receptor, limits ion-channel activation and sodium influx, and reduces the signaling associated with muscle-cell depolarization and contraction.

This is a post-synaptic, muscle-side rationale, distinct from peptides commonly described as pre-synaptic acetylcholine-release modifiers. REFINE uses this mechanism as a biologically plausible cosmetic explanation for the dynamic-wrinkle improvements observed in ingredient-level studies.

4.3 Niacinamide: the barrier-to-visible-aging bridge

Niacinamide is the amide form of vitamin B3 and a precursor in the NAD+ coenzyme family, which is involved in cellular energy metabolism and stress-response biology. Its central cosmetic relevance in REFINE is a connected set of functions:

• Barrier-lipid synthesis: topical nicotinamide supports synthesis of ceramides, free fatty acids, cholesterol and related stratum-corneum lipids, helping reduce water loss and improve barrier quality.
• Moisture-retention support: glycerin and sodium hyaluronate provide hydration at the surface; niacinamide supports the barrier that helps retain that hydration.
• Visible aging support: 5% topical niacinamide improved fine lines and wrinkles, elasticity, texture, blotchiness, sallowness and uneven pigmentation in a 12-week controlled facial study.
• Tone support: niacinamide can reduce melanosome transfer in cell models and has shown clinical improvement in hyperpigmentation and skin lightness.

For REFINE, SYN-AKE® is directed at the appearance of movement-associated folding; niacinamide supports the hydrated, resilient-looking, smoother and more even surface through which those lines appear. That is the formula’s most important complementary relationship.

4.4 Emerging cellular-resilience context

Mechanistic research suggests that nicotinamide can preserve energy metabolism under UVB and oxidative stress, enhance repair of UV-induced photolesions in keratinocytes and ex vivo skin, reduce stress-induced inflammatory mediators, and modulate keratinocyte proliferation, differentiation and premature-senescence markers.

A 2024 study of a formula containing 6% niacinamide plus high- and intermediate-molecular-weight hyaluronic acid reported improvements in fine lines, wrinkles, smoothness, homogeneity and radiance over two months, together with molecular findings the authors described as consistent with senomorphic activity. That study evaluated a different multi-ingredient formula, so REFINE does not borrow its precise clinical numbers or describe itself as senomorphic. The relevance is the broader formulation rationale.

4.5 Integrated formula logic

1. Expression-line targeting: 4% SYN-AKE® supplies the formula’s targeted neuromodulating peptide rationale for movement-associated lines.
2. Immediate hydration and surface refinement: glycerin and sodium hyaluronate help increase water content and improve the look and feel of dry, fine-lined skin.
3. Barrier and progressive skin quality: niacinamide supports barrier lipids, moisture retention, elasticity, texture, evenness and the visible appearance of fine lines with consistent use.
4. Conditioning and formula support: tocopheryl acetate, zinc oxide, guar gum and the preservation system support skin conditioning, physical structure, stability and the clear, lightweight, spreadable use experience.

5 · Ingredient-level efficacy

5.1 SYN-AKE® at 4%: dynamic-wrinkle outcomes

The key data for REFINE are manufacturer-run clinical and profilometric studies of creams containing 4% SYN-AKE® used twice daily for 28 days. After 28 days, profilometry reported approximately 21% lower surface roughness (Ra), 15 to 20% lower wrinkle-depth parameters (Rz and Rt), and up to 52% reduction in maximum forehead wrinkle depth among best responders. Approximately 80% of participants showed measurable smoothing, and approximately 70 to 75% showed measurable wrinkle-depth reduction. Supplier-reported observations indicate that early subjective or instrumental change can emerge around days 7 to 14, with day 28 serving as the central evaluation point.

5.2 Niacinamide: progressive visible skin-quality outcomes

• Fine lines, wrinkles, texture and elasticity: the 12-week 5% randomized, double-blind split-face study found significant improvement versus vehicle across these measures in women with facial photoaging.
• Tone and appearance: the same body of work found improvements in hyperpigmented spots, red blotchiness and skin yellowing or sallowness. Separate controlled work reported significantly reduced hyperpigmentation and greater skin lightness after four weeks.
• Barrier support: nicotinamide increased key epidermal lipid synthesis and reduced TEWL in dry skin.
• Niacinamide and glycerin: randomized controlled moisturizer studies found this pairing improved stratum-corneum integrity and cosmetic xerosis over 35 days.

5.3 Sodium hyaluronate: hydration and visible line softening

In one facial-serum study involving 40 subjects, regular application produced a 134% immediate hydration increase, 55% higher hydration after six weeks, and approximately 31% and 14% improvements in fine lines and wrinkles respectively. Multi-weight hyaluronic acid studies likewise report improvement in hydration, smoothness and fine-line appearance over four to eight weeks with good tolerability.

5.4 Glycerin: barrier resilience and comfort

In tape-stripping and surfactant-challenge models, glycerin-containing creams produced faster barrier recovery, lower TEWL and higher corneometry values than vehicle controls over several days. In practical cosmetic terms, this supports smoother-feeling skin, less visible roughness, greater suppleness and better day-to-day comfort, particularly relevant to thin, highly mobile areas such as the forehead and eye contour.

5.5 Tocopheryl acetate: stable vitamin E support

Tocopheryl acetate is a stable vitamin E derivative used in cosmetic formulations for skin conditioning and antioxidant support. Cosmetic Ingredient Review assessments have concluded tocopherols and tocotrienols are safe as used in cosmetics. It is positioned as a supporting component of REFINE’s overall skin-conditioning environment rather than as a principal efficacy hero.

5.6 Zinc oxide: supporting formulation component

Zinc oxide is a multifunctional mineral used in cosmetics for functions that can include bulking, color and opacity, skin protection and UV absorption depending on its grade, concentration and formulation context. REFINE’s shake-well direction is consistent with a water-based serum containing one or more dispersed components. It supports the formula’s physical architecture and does not need to be a central consumer-benefit story. REFINE is a daily cosmetic serum; broad-spectrum sunscreen remains the appropriate dedicated daytime UV-protection step.

6 · REFINE wrinkle-refinement timeline

Phase	What the evidence supports
First application to 24 hours	Glycerin and sodium hyaluronate begin drawing and retaining water in the stratum corneum; in an HA-serum study hydration more than doubled immediately after application. Hydrated skin can look more supple, so fine lines may appear less sharply defined.
Days 7 to 14	4% SYN-AKE® ingredient studies reported early subjective and instrumental changes, especially in crow’s-feet and forehead lines, alongside barrier-supporting routine effects from glycerin and niacinamide.
Weeks 3 to 4	At approximately 28 days of twice-daily use, 4% SYN-AKE® study creams demonstrated mean improvement in dynamic-wrinkle parameters of approximately 15 to 21%, with up to 52% depth reduction in best responders.
Weeks 6 to 12	Extended HA-serum use has been associated with 31% improvement in fine lines and 14% improvement in wrinkles at week six; controlled 5% niacinamide studies documented visible aging, texture, tone and elasticity outcomes most clearly by 8 to 12 weeks.
Continued use	Neuromodulating-peptide benefits are reversible rather than permanently structural; the appearance benefit may gradually diminish after discontinuation, so consistent use maintains the result.

For this reason, 28 days is an evidence-linked first evaluation point, not the finish line. The formula’s hydration, barrier and visible skin-quality rationale continues beyond that point.

7 · Safety profile

7.1 Peptide safety framework

Contemporary cosmetic-peptide safety assessment relies on weight-of-evidence evaluation, including sequence and structure assessment, in silico screening, cytotoxicity and genotoxicity data, local irritation and sensitization assessment, exposure modeling and post-market monitoring. Available evidence distinguishes between ingredient data, raw-material hazard documentation and finished-product testing.

7.2 SYN-AKE® ingredient safety

• No mutagenicity in reported Ames testing and no material cytotoxicity at relevant cosmetic test concentrations in standard supplier-reported data.
• Human patch-test experience with SYN-AKE®-containing creams at 3 to 4% active reporting no significant irritation or sensitization in most volunteers; occasional mild, transient tingling or tightness has been described.
• Ingredient and database reviews generally characterize topical SYN-AKE® as low hazard at cosmetic use levels, with no established evidence of systemic neuromuscular toxicity from intended topical use.

7.3 Niacinamide and supporting-ingredient context

Topical niacinamide is generally well tolerated in clinical cosmetic studies, including the 5% 12-week split-face facial study. Glycerin, sodium hyaluronate, tocopheryl acetate and the phenoxyethanol and ethylhexylglycerin preservation system have long histories of cosmetic use, while each individual’s skin sensitivity can vary.

7.4 Use guidance

• Apply only to intact, healthy skin; avoid areas that are broken, actively irritated or inflamed.
• Avoid direct contact with the eyes; rinse thoroughly with water if contact occurs.
• People with highly reactive or allergy-prone skin should perform a patch test before regular use.
• Pregnant or breastfeeding individuals should consult an appropriate healthcare professional before use, because long-term systemic data on topical neuromodulating cosmetic peptides in these populations are limited.

8 · Study context and cosmetic positioning

The clinical figures in this paper are attributed to the specific ingredient systems studied. REFINE was formulated around those evidence-backed ingredients, the 4% SYN-AKE® use level and twice-daily application model, and complementary functions to create one daily expression-line routine. SYN-AKE® studies inform its dynamic expression-line focus; niacinamide studies inform its barrier and progressive skin-quality support; and hyaluronic acid and glycerin research informs its hydration and visible surface-refinement layer.

REFINE is a cosmetic expression-line serum designed to improve the visible appearance of dynamic expression lines and fine lines, while hydrating, smoothing and conditioning skin in expression-prone areas. It is a topical, non-injectable daily treatment and should be used alongside a complete skincare routine, including broad-spectrum sunscreen during the day.

9 · Summary and practical use

• Immediately: glycerin and sodium hyaluronate support more hydrated, smoother-feeling skin, with fine lines appearing less dry and sharply defined.
• Within 1 to 2 weeks: 4% SYN-AKE® ingredient-study observations showed early softening of crow’s-feet and forehead expression lines in some participants using a twice-daily formula.
• Around 4 weeks: 4% SYN-AKE® clinical ingredient data showed measurable improvement in dynamic-wrinkle parameters; this is the central expression-line evaluation point for the REFINE routine.
• Across 6 to 12 weeks: continued hydration, barrier support and niacinamide’s established visible-aging rationale provide the basis for keeping REFINE in a consistent routine after the initial 28-day period.

REFINE is best used as a 28-day expression-line treatment trial and a continuing skin-quality routine: apply 1 to 2 pumps morning and evening to clean, dry skin, focus on forehead, glabella and crow’s-feet areas, photograph baseline and four-week results under comparable conditions, and continue as desired to maintain and layer benefits.