Best Anti-Aging Skincare

A modern topical retinoid for acne — now available over the counter (0.1%) as well as by prescription (0.3%). A drug, not a supplement or cosmetic. Adapalene is a third-generation retinoid selective for the retinoic-acid receptor beta; it normalizes how skin cells shed (comedolytic) and is anti-inflammatory. The honest framing: this is one of the best-evidenced acne treatments — a 5-trial meta-analysis and a 40-trial network meta-analysis show it matches tretinoin's efficacy with faster onset and notably better tolerability, and the adapalene-benzoyl peroxide combination is among the most effective regimens available. Caveats: it still causes retinoid irritation and slow onset, it is not superior to (only as good as) other retinoids, and — as a retinoid — it is generally avoided in pregnancy.

Daily broad-spectrum sunscreen — the single most evidence-based anti-aging skincare step there is, and the one most 'anti-aging' actives are really just trying to compensate for. The honest framing: this is the only topical on this list backed by a proper randomized controlled trial for skin aging itself. In the landmark Hughes 2013 trial (n=903), people randomized to daily sunscreen showed 24% less photoaging over 4.5 years — and no detectable increase in skin aging at all — while the mechanism (UV → matrix-metalloproteinase activation → collagen breakdown) is textbook. The same trial cohort also had less skin cancer. The honest caveats: the benefit is overwhelmingly prevention, not reversal of existing damage; real-world results depend entirely on applying enough and reapplying; and chemical (organic) UV filters are systemically absorbed above an FDA testing threshold (clinical significance unknown — mineral zinc-oxide/titanium-dioxide filters sidestep this). If you do one thing for your skin, it's this.

A prescription TOPICAL retinoid (Retin-A, Renova) — the acid form of vitamin A and the gold-standard, best-evidenced topical treatment for photoaging and acne. Multiple double-blind RCTs show it reduces fine wrinkles, mottled hyperpigmentation, and roughness over months, with histologic increases in dermal collagen. Caveats: retinoid dermatitis (irritation, peeling, dryness), photosensitivity, and it is CONTRAINDICATED IN PREGNANCY. Prescription drug, not a supplement; distinct from weaker OTC 'retinol' cosmetics.

A topical skincare acid applied to the skin for rosacea, acne, and uneven tone — unusual among 'cosmetic' actives because it has genuine drug-grade evidence. Azelaic acid is a naturally occurring dicarboxylic acid that is anti-inflammatory, antimicrobial, and a tyrosinase inhibitor. It is sold both as an over-the-counter cosmetic (around 10%) AND as a 15-20% prescription medication. The honest framing: the strongest, best-replicated evidence — including double-blind phase III trials and a Cochrane review that rated it high-quality for papulopustular rosacea — used the PRESCRIPTION strengths (15-20%), not the ~10% OTC cosmetic form. It also has solid evidence for acne and melasma. Head-to-head it is beaten for acne (by benzoyl peroxide + clindamycin) and tends to cause more local irritation (burning, stinging) than several comparators. For rosacea or persistent acne, the prescription form under a clinician is the evidence-based route.

The long-standing gold-standard topical skin-lightening agent for melasma and hyperpigmentation — and now a regulated drug, not a cosmetic. Hydroquinone (HQ) competitively inhibits tyrosinase and is toxic to overactive pigment cells. The honest framing: it is the most rigorously studied and most effective topical depigmenter — a large pivotal RCT, a Cochrane review, and recent meta-analyses all use HQ 4% (and the 'Kligman' triple-combination with a retinoid + steroid) as the benchmark that newer agents are measured against and rarely beat. But it carries real liabilities: irritation, rebound pigmentation, and — with prolonged or high-strength use — a disfiguring complication called exogenous ochronosis. For these reasons it was pulled from US over-the-counter sale in 2020 (now prescription-only) and is restricted in the EU and elsewhere. Effective, but for monitored, time-limited medical use.

Barrier-repair skincare applied to the skin — ceramide-containing moisturizers, NOT (in this context) oral ceramide supplements. Ceramides are the lipids that, with cholesterol and fatty acids, form the skin's water-proofing 'mortar.' These lipids are genuinely depleted in dry, aging, and atopic (eczema-prone) skin, so replacing them topically has a sound rationale. The honest framing: ceramide creams reliably lower water loss, raise hydration, and reduce eczema flares — but head-to-head trials show no consistent advantage over a good basic moisturizer (plain petrolatum, or a hyaluronic-acid foam), so most of the benefit is the moisturizing itself, with the ceramide a plausible-but-unproven upgrade. They are very well tolerated. These are skin-barrier/appearance outcomes, not health outcomes.

A newer non-hydroquinone skin-lightening cream for melasma — an aminothiol naturally present in cells, applied to the skin. The honest framing: cysteamine 5% has a genuinely respectable evidence base — multiple double-blind placebo-controlled RCTs and a 2024 meta-analysis show it significantly beats placebo for melasma, and several head-to-head trials pit it against hydroquinone and triple-combination creams. But its ceiling is capped: against hydroquinone it is non-superior (and in one direct comparison actually inferior), trials are small and several share a manufacturer-affiliated author, and its main real-world drawback is tolerability — a characteristic sulfur odor plus erythema/burning. A credible, hydroquinone-free alternative, not a clear upgrade.

A topical alpha-hydroxy acid (AHA) applied to the skin for texture, tone, and mild photoaging — a cosmetic exfoliant, not ingested. Glycolic acid is the smallest AHA; it loosens the 'glue' between dead surface cells (a targeted breakdown of corneocyte desmosomes), driving exfoliation and, at higher strengths, dermal changes. The honest framing: at leave-on cosmetic strengths (5-15% daily cream) the benefit is real but modest — significant for skin texture and discoloration, but not for wrinkles, and weaker than a retinoid. The stronger, clearer evidence is for in-office peels (20-70%), which are a different, more irritating intervention. It is acidic and can sting, and AHAs increase sun sensitivity. These are cosmetic appearance outcomes, not health outcomes.

A topical humectant applied to the skin (serums/creams) for hydration and short-term fine-line smoothing — a cosmetic, NOT (in this context) an oral supplement, injectable filler, or joint injection. Hyaluronic acid is a water-binding sugar naturally abundant in skin. The honest framing: topical HA reliably improves surface hydration and modestly improves elasticity and fine-line appearance in controlled trials — but the benefit is largely a surface plumping/hydration effect. Standard high-molecular-weight HA penetrates poorly and stays in the outermost layer; only low-molecular-weight or fragment HA meaningfully penetrates, so real-world effect is molecular-weight- and formulation-dependent. It is very well tolerated. These are cosmetic appearance outcomes, not health outcomes, and topical HA is not a dermal filler.

A topical skin-brightening active applied to the skin for hyperpigmentation and melasma — a cosmetic, not ingested. Kojic acid is a fungal-derived tyrosinase inhibitor (it chelates the copper at the enzyme's active site, slowing melanin production). It has genuine human RCT support for melasma and appears in a large 2023 meta-analysis with a statistically significant effect. The honest framing: the effect size is modest — the weakest of the major depigmenting agents in that meta-analysis — and most of the strong evidence is for kojic acid ADDED to hydroquinone/glycolic-acid bases rather than used alone. Contact sensitisation (allergy) is a well-documented downside of long-term use. These are cosmetic appearance outcomes, not health outcomes.

An alpha-hydroxy acid (AHA) applied to the skin for exfoliation, hydration, photoaging, and pigmentation — a cosmetic, not ingested. Lactic acid does double duty: at peel/leave-on strengths it exfoliates and modestly improves photodamaged skin, and at low concentration it acts as a natural moisturizing factor that raises skin ceramides and hydration (the L-isomer is notably more potent here). The honest framing: a classic vehicle-controlled RCT supports modest photoaging benefit, and the ceramide/hydration mechanism is well characterized — but for pigmentation it consistently underperforms glycolic acid, and like all AHAs it transiently increases sun sensitivity, so daily sunscreen is essential.

A topical cosmetic form of vitamin B3 — a leave-on skincare active applied to the skin, NOT (in this context) an ingested supplement. Niacinamide (nicotinamide) is one of the better-evidenced cosmetic actives: short, double-blind, split-face trials — many run or funded by Procter & Gamble — show real but modest improvements in hyperpigmentation, fine lines, sallowness, sebum, and the skin barrier at roughly 2-5%. It is mechanistically plausible (it boosts ceramide/barrier-lipid synthesis and reduces transfer of pigment to skin cells) and consistently well tolerated. The honest framing: it is generally an ADJUVANT rather than a first-line active — in head-to-head pigmentation trials hydroquinone still edges it out — and most trials are small and industry-linked. These are cosmetic appearance outcomes, not health outcomes. (Separately, ORAL nicotinamide has its own, unrelated evidence for reducing non-melanoma skin cancers — that is a different, ingested use and not what this topical entry covers.)

A topical provitamin B5 applied to the skin for hydration, barrier repair, and soothing — a cosmetic/derm ingredient, not (in this context) an ingested supplement. Panthenol converts in skin to pantothenic acid (vitamin B5), a building block of coenzyme A, and acts as a humectant. The honest framing: it has reasonably consistent controlled-trial evidence — it lowers transepidermal water loss, raises hydration, speeds barrier repair after irritation, and accelerates early-phase superficial wound healing — with a plausible mechanism. Caveats: trials are small, many test multi-ingredient or branded formulations (often manufacturer-run), and head-to-head it isn't always best (outperformed by ectoin in radiodermatitis; no clear advantage over plain ointment in diaper rash). A well-tolerated, genuinely useful barrier/soothing ingredient.

A topical brightening active applied to the skin for melasma and stubborn pigmentation — a cosmetic/derm active, not (in this context) ingested. Tranexamic acid (a drug best known as an antifibrinolytic) interrupts the plasmin signalling that activates melanocytes, reducing pigment. The honest framing: topical TXA performs comparably to hydroquinone in small split-face trials and is very well tolerated, but the strongest melasma evidence — a placebo-controlled RCT and favorable meta-analysis rankings — is for ORAL tranexamic acid, not topical, and topical efficacy is limited by skin penetration. A network meta-analysis ranks topical TXA below oral TXA, lasers, and triple-combination cream. These are cosmetic appearance outcomes, not health outcomes.

Topical vitamin C — a leave-on antioxidant skincare active applied to the skin, NOT (in this context) an oral vitamin C supplement. As L-ascorbic acid or a stabilized derivative, it has a strong rationale: vitamin C is an essential cofactor for collagen synthesis and a free-radical scavenger that supports photoprotection. Small, vehicle-controlled split-face trials show genuine but modest improvements in wrinkles, skin texture, and pigmentation, and it has a consistent brightening/depigmenting signal. The honest framing: the whole topical-vitamin-C trial base is tiny (a systematic review pooled ~7 studies and ~139 people), formulations are notoriously unstable (they oxidise and lose potency), and most positive trials combine vitamin C with vitamin E, ferulic acid, or other actives — so vitamin-C-alone efficacy is hard to isolate. These are cosmetic appearance outcomes, not health outcomes, and it is not a sunscreen substitute.

A viral 'cica' botanical applied to the skin for soothing, barrier repair, wound healing, and anti-aging — a topical cosmetic, not (in this context) the oral gotu kola supplement. Centella asiatica's active triterpenes (madecassoside, asiaticoside, asiatic/madecassic acid) stimulate collagen and calm inflammation. The honest framing: the best human evidence is for wound healing and post-procedure soothing; the anti-aging signal rests on a single small (n=20) trial that combined madecassoside with vitamin C, scar/stretch-mark evidence is weak, and much of the mechanism is in-vitro/animal. Contact allergy is uncommon but documented. A genuinely promising, well-tolerated soothing botanical with moderate, still-maturing evidence.

A large-molecule alpha-hydroxy acid (AHA) applied to the skin for acne, pigmentation, and texture — a cosmetic, not ingested. Because mandelic acid is a bigger molecule than glycolic acid, it penetrates more slowly and is gentler, which is its genuine, evidence-backed niche: comparable results to glycolic or salicylic acid with better tolerability, especially in sensitive and darker skin. The honest framing: multiple randomized peel trials show it matches its peers for acne and melasma rather than beating them, the evidence is small-trial and peel-dominated (often as a salicylic-mandelic combination), and leave-on (cream/serum) data are thin. A gentle, tolerable AHA — chosen for comfort and skin-of-color suitability more than superior potency.

A topical cosmetic form of vitamin A — a leave-on skincare active applied to the skin, NOT something you swallow as a supplement and NOT prescription tretinoin. Retinol is the over-the-counter (OTC) member of the retinoid family. In skin it is converted, in two steps, to retinoic acid — the active molecule that binds nuclear retinoid receptors, nudges fibroblasts to make procollagen, and protects existing collagen from UV-driven breakdown. Several small, double-blind, vehicle-controlled facial trials show a genuine but MODEST improvement in fine lines, photodamage, and pigmentation. The catch: OTC retinol is weaker and less proven than prescription tretinoin, only a small fraction of what you apply actually converts to retinoic acid, a focused systematic review judged the OTC-retinol evidence largely untrustworthy, and it commonly causes dryness, peeling, and irritation. The benefit is a cosmetic appearance effect, not a health outcome.

A topical beta-hydroxy acid (BHA) applied to the skin mainly for acne, plus pores and texture — an over-the-counter acne medicine, not ingested. Salicylic acid is oil-soluble, so it penetrates into pores and dissolves the debris and dead cells that form comedones; it is also anti-inflammatory. The honest framing: it's a long-established OTC acne drug with a plausible mechanism and consistent signal across trials — it reduces acne lesions comparably to glycolic acid, mandelic acid, and even benzoyl peroxide head-to-head — but the dedicated RCT evidence base is surprisingly thin and dated (small trials, old, low-quality), and a systematic review found no proven superiority over alternatives. It can sting and dry the skin. These are skin-appearance/skin-condition outcomes.

A ubiquitous, gentle skincare ingredient applied to the skin for soothing, barrier support, and skin-conditioning — a cosmetic, not ingested. Allantoin is keratolytic (smooths rough skin), mildly promotes cell proliferation/wound healing, and calms irritation, which is why it appears in countless moisturizers, after-sun, and barrier products. The honest framing: it is benign and conventionally used as a positive control for wound healing, and several real human RCTs of allantoin-containing products (post-surgical gels, scar gels) show modest improvement — but essentially all that evidence is for multi-ingredient formulations, so allantoin's own contribution can't be isolated; its standalone effect is small (≈1.2× in cell assays); and a systematic review of inflamed skin found no clear benefit. A well-tolerated supporting actor, not a hero ingredient.

A topical skin-brightening active applied to the skin for hyperpigmentation and melasma — a cosmetic, not ingested. Alpha-arbutin is a plant-derived glucoside of hydroquinone that competitively inhibits human tyrosinase, the enzyme that makes melanin, and is marketed as a gentler 'hydroquinone-free' brightener. The honest framing: the mechanism is solid and it reliably reduces melanin in cell and skin-model studies, but human clinical evidence is modest — small, pilot-grade trials, usually combined with other actives (kojic acid, sunscreen, lasers), with no large standalone RCT. There's also a chemistry caveat: arbutin can hydrolyse to hydroquinone under heat, UV, or acidic conditions, undercutting the 'safe, hydroquinone-free' claim. These are cosmetic appearance outcomes, not health outcomes.

A plant-derived topical skincare active marketed as a gentler 'retinol alternative' — a leave-on cosmetic applied to the skin, NOT ingested. Bakuchiol is a meroterpene purified from the seeds of Psoralea corylifolia (babchi). Despite no structural resemblance to retinoids, gene-expression studies show it behaves like a functional retinol analogue, switching on collagen genes. The headline evidence is one good 12-week randomized, double-blind trial (44 people) in which bakuchiol matched retinol for reducing wrinkles and pigmentation while causing less stinging and scaling. The honest framing: that single 44-person study carries most of the weight. The rest of the human evidence is thin — small, often unblinded or uncontrolled trials, several testing bakuchiol only inside multi-ingredient products, and many industry-linked; a 2024 systematic review judged the body of evidence high-risk-of-bias and not poolable. These are cosmetic appearance outcomes, not health outcomes. (Note: purified topical bakuchiol is distinct from oral Psoralea corylifolia, which carries hepatotoxicity and phototoxic-furocoumarin concerns.)

A soothing, hydrating polysaccharide applied to the skin for barrier support, calming, and anti-aging — a cosmetic, not (in this context) the ingested beta-glucan supplement. Sourced from oats or yeast, it forms a humectant film, interacts with skin immune cells, and (in lab studies) stimulates collagen and inhibits collagen-degrading enzymes. The honest framing: human evidence is best for wound/burn healing and barrier/UV protection; clinical anti-wrinkle evidence is thin, resting on in-vitro enzyme assays, a single-patient multi-ingredient case study, and industry-affiliated reviews rather than controlled facial trials. A gentle, well-tolerated soothing ingredient with promising but unproven anti-aging claims.

A plant antioxidant best known as the stabilizer that makes vitamin C + vitamin E serums work better — applied to the skin, not ingested. The honest framing: ferulic acid's famous result is that adding it to a 15% vitamin C + 1% vitamin E solution stabilizes both vitamins and roughly doubles their UV photoprotection. But essentially all the evidence is for ferulic acid as a booster inside C+E formulas (and the headline 'doubling' study was in pig skin); there is virtually no evidence that topical ferulic acid alone does anything for photoaging. It's an antioxidant adjunct to sunscreen — a supporting ingredient, not a standalone active.

A licorice-root botanical applied to the skin for brightening and soothing — a topical cosmetic, not the ingested licorice supplement. Its actives glabridin (a tyrosinase inhibitor) and liquiritin (which disperses melanin) plus anti-inflammatory compounds give it a coherent rationale for fading hyperpigmentation and calming redness. The honest framing: the human evidence is genuinely thin — one small split-face RCT of liquiritin cream for melasma, one comparative trial of a licorice-containing blend that nearly matched hydroquinone, and otherwise preclinical work. A gentle, plausible brightener whose isolated effect is poorly established and rests on small, dated, mostly combination studies.

Green tea polyphenols (chiefly EGCG) applied to the skin as an antioxidant for photoprotection, acne, and anti-aging — distinct from the oral green tea extract. The honest framing: there's a real but modest, mostly small-trial signal. Controlled human studies show topical green tea reduces UV-induced redness, sunburn cells, and oxidative/DNA damage; the best acne work pairs solid mechanism data with a positive split-face RCT; and the antioxidant/anti-inflammatory mechanism (plus MMP suppression relevant to wrinkles) is coherent. But the clinical trials are small, often uncontrolled or pilot/split-face, much of the anti-aging evidence is in-vitro, and EGCG is chemically unstable and penetrates skin poorly — so real-world potency depends heavily on a stabilized formula. Best used as an antioxidant adjunct (alongside sunscreen), not a standalone treatment.

DNA-fragment actives (polydeoxyribonucleotide/polynucleotides, marketed as 'salmon DNA') used for skin regeneration and hydration. The crucial honest distinction: the real evidence is for INJECTABLE PDRN/polynucleotides — including a large RCT for wound healing and small cosmetic 'skin booster' trials — NOT for topical creams/serums. Large DNA fragments penetrate intact skin poorly, and there are essentially no controlled trials of topical 'salmon DNA' skincare. The mechanism (adenosine A2A receptor + nucleotide salvage → fibroblast collagen, angiogenesis, anti-inflammatory) is real, but a topical product should not be assumed to do what the injectable does. Promising as an injectable; unproven as a cream.

A gentler, next-generation family of exfoliating acids (gluconolactone, lactobionic acid) applied to the skin — a cosmetic, not ingested. Because PHA molecules are larger than AHAs like glycolic acid, they penetrate more slowly and irritate less, while adding humectant and antioxidant properties. The honest framing: in head-to-head trials PHAs deliver anti-aging benefits comparable to AHAs with notably better tolerability — their real, evidence-backed niche is gentleness for sensitive and rosacea-prone skin. But the efficacy evidence is thin, older (mostly 2004–2010), and heavily industry-originated; there are no large modern independent RCTs, and effects are modest and roughly match or slightly trail AHAs.

A lightweight, skin-identical emollient oil applied to the skin for moisturization and barrier support — a cosmetic, not ingested. Squalane is the stable, oxidation-resistant (hydrogenated) form of squalene, a lipid that naturally makes up about 13% of human sebum. The honest framing: it is exceptionally safe, well-tolerated, and non-greasy, with a sound rationale as a skin-identical lipid — but there are essentially no controlled trials of squalane on its own. The human evidence is as one emollient ingredient inside multi-component moisturizers or as a formulation base, so measured hydration benefits can't be credited to squalane specifically. A reliable, elegant moisturizing oil; just don't expect dedicated efficacy data.

A topical cosmetic peptide — a leave-on skincare ingredient, NOT something you swallow, inject, or take as a supplement, and NOT a drug. Argireline (acetyl hexapeptide-8, also sold as acetyl hexapeptide-3) is a six-amino-acid fragment modelled on the SNAP-25 protein. It is marketed as 'topical Botox' because, in cell systems, it interferes with the SNARE complex that nerve endings use to release neurotransmitter, in theory slightly relaxing the tiny muscle contractions that create expression lines. There ARE real human topical studies — small, short, vehicle-controlled split-face wrinkle trials — and they do show modest reductions in the appearance of fine lines. But the effect sizes are small, several of the trials are industry-linked, and this is a cosmetic effect on wrinkle APPEARANCE, not a health outcome. It is generally well tolerated on skin. This entry exists to describe a cosmetic ingredient honestly, not to recommend an ingestible supplement.

A naturally occurring copper-binding tripeptide used in topical skincare for collagen support and skin repair. Honest appraisal: the believable human evidence is TOPICAL/cosmetic — and even there it's thin and mostly formulation-level (e.g. one small RCT after laser resurfacing where patients felt their skin was better but objective measures didn't differ). Most mechanistic claims come from in-vitro and animal work. The injectable use sold on the grey market has no human safety or efficacy data and is research-use-only.

'Regenerative' anti-aging serums built around growth factors and cytokines (from human fibroblast cultures, EGF, or snail/plant sources) applied to the skin. The honest framing: growth factors genuinely stimulate fibroblasts and collagen, and small studies report modest wrinkle/texture improvements — but the evidence is weak. The strongest synthesis (a 33-study review) found three head-to-head RCTs with no significant benefit over control, the human trials are mostly small, open-label, and manufacturer-funded, and these are large proteins that may not penetrate intact skin. Biologically plausible, commercially popular, but only low-grade and partly subjective support.

A topical cosmetic peptide — a leave-on skincare ingredient, NOT something you swallow, inject, or take as a supplement, and NOT a drug. Matrixyl is palmitoyl pentapeptide-4 (pal-KTTKS), a fatty-acid-attached fragment of type I collagen; the popular 'Matrixyl 3000' blend pairs palmitoyl tripeptide-1 with palmitoyl tetrapeptide-7. Rather than relaxing muscle like Argireline, Matrixyl is a 'signal peptide' marketed to nudge skin fibroblasts to make more collagen and extracellular matrix. There ARE real human topical studies — most notably a 12-week, double-blind, placebo-controlled, split-face trial that found modest but significant reductions in fine-line appearance — alongside in-vitro work showing it raises collagen/ECM genes. But the human effect sizes are small, several trials are industry-linked or null, and this is a cosmetic effect on skin APPEARANCE, not a health outcome. It is generally well tolerated on skin. This entry describes a cosmetic ingredient honestly, not an ingestible supplement.

A viral K-beauty topical applied to the skin for hydration, smoothness, and anti-aging — a cosmetic, not ingested. Snail secretion filtrate (SSF) is the mucus from snails (usually Helix aspersa), naturally rich in glycoproteins, hyaluronic acid, glycolic acid, zinc, and antioxidants. The honest framing: it has a plausible mechanism (antioxidant, anti-collagenase/anti-tyrosinase, growth-factor-like fibroblast stimulation) and one small split-face RCT plus an open-label trial show modest cosmetic improvement — but the human evidence is just a few small, mostly industry-linked trials, the best 'anti-aging' study bundled a retinoid and other actives (so the snail extract can't be isolated), and most supporting data is in-vitro or animal. Commercially huge, genuinely emerging evidence. These are cosmetic appearance outcomes, not health outcomes.

A buzzy 'regenerative' skincare ingredient — nanoscale vesicles (usually from stem cells, platelets, or plants) applied to skin, almost always with microneedling or laser, for anti-aging and hair. The honest framing: this is early, low-confidence, and largely unregulated. The few human studies are small (n=25-30), short, mostly from overlapping industry-linked groups, and every one delivers exosomes alongside a procedure (microneedling/CO2 laser) that itself improves skin and hair — so the exosomes' own contribution can't be isolated. The mechanism (microRNA/protein cargo nudging fibroblasts to make collagen) is plausible but mostly shown in cells/animals. A major complications review specifically flags exosomes as an unregulated, escalating-risk aesthetic therapy, and products are unstandardized. Treat all claims as preliminary.

A topical 'anti-wrinkle' cosmetic peptide (acetyl octapeptide-3), an elongated relative of argireline that is marketed to relax expression lines by mimicking a SNARE-complex fragment. Honest appraisal: independent human evidence for SNAP-8 specifically is minimal; most support is manufacturer data and extrapolation from argireline. A topical cosmetic ingredient, not a supplement or drug.