snap-8 vs ghk-cu

updated October 28, 2026

snap-8 (tier D) vs ghk-cu (tier S): what each is, why each got its grade, half-life and source counts side by side.

snap-8 · tier D

acetyl octapeptide-3. marketed as topical botox. the science doesn't hold up.

tier rationale

D-tier because the claims are substantially inflated relative to the evidence, and the fundamental pharmacology (topical delivery of a hydrophilic peptide to affect neuromuscular SNARE complexes) is weak at every step. Not F-tier because the compound is real, the mechanism is plausible at low-magnitude, and it doesn't harm anyone. It's just not what the marketing implies. This is the cosmetic-industry peptide pattern: plausible mechanism, manufacturer-friendly evidence, inflated claims, modest real-world effects. It can fit low-risk cosmetic ritual, but not a serious wrinkle-treatment thesis.

ghk-cu · tier S

the copper peptide with the strongest skin evidence in the catalog. topical record first, injectable story thinner.

tier rationale

the most studied cosmetic peptide in history. pickart 1973: young plasma applied to aged liver cells made them behave young. five decades of topical research on collagen, wound healing, inflammation. cleanest safety profile in the catalog after 40+ years of cosmetic use. S because topical efficacy is documented and safety is exceptional. the asterisk: injectable GHK-Cu has a much thinner human evidence base.

at a glance

reptides grades the research record and cites the literature behind every call. research reference only; not medical advice.