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Peptide Reality Check

The peptide world is exploding — and the hype rarely matches the evidence. Here's the honest grade for each one: which are FDA-approved, which rest on animal data, and which are gray-market gambles. Grounded in what the experts actually said.

FDA-approved / strong human data Prescription or investigational Animal data / anecdote only
Based on expert consensus from publicly available videos plus public FDA/regulatory status — not medical advice. Peptides are prescription territory; talk to a physician.
PT-141 FDA-approved

Sexual health / libido (melanocortin) · Bremelanotide, Vyleesi
Semaglutide FDA-approved, strong human data

Weight loss / metabolic (GLP-1) · Ozempic, Wegovy
Tesamorelin FDA-approved

Growth hormone / visceral fat · Egrifta (GHRH analog)
Tirzepatide FDA-approved, strong human data

Weight loss / metabolic (dual GIP/GLP-1) · Mounjaro, Zepbound
Retatrutide Investigational — strong Phase 3 data, not yet approved

Weight loss / metabolic (investigational) · Triple agonist (GLP-1 + GIP + glucagon)
Sermorelin Prescription (GHRH analog)

Growth hormone secretagogue · GHRH analog
Thymosin Alpha-1 Immune use; approved in some countries

Immune support · Tα1
BPC-157 Animal data only — no human trials

Tissue repair / recovery · Body Protection Compound 157
CJC-1295 Not approved — trial failures, now restricted

Growth hormone secretagogue · GHRH analog
Epitalon Animal / Soviet-era data — no FDA approval

Longevity / circadian · Epithalon
GHK-Cu Thin — topical/aesthetic, limited research

Skin / regeneration · Copper peptide
Ipamorelin No human approval — clinic/anecdote

Growth hormone secretagogue · Ghrelin-receptor agonist (GHRP)
MK-677 Not approved — strong appetite/cortisol effects

Growth hormone secretagogue (oral) · Ibutamoren
MOTS-c Thin — one-source, early research

Mitochondrial / energy · Mitochondrial-derived peptide
TB-500 Thin — animal/veterinary, no human trials

Tissue repair / recovery · Thymosin Beta-4 (fragment)

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