One table, no spin. Where each compound stands with regulators, how strong its human evidence is, and what to keep in mind.
Evidence key: strong limited / mixed minimal or none in humans.
| Compound | Regulatory status | Human evidence | Key consideration |
|---|---|---|---|
| Tirzepatide | Approved medicine (diabetes & weight) | Strong | Real side effects; weight regain on stopping; prescription-only |
| Retatrutide | Investigational; not approved anywhere | Phase 2/3 | Strong trial data but unapproved; anything sold now is unregulated |
| MOTS-c | Not approved; research chemical | Very limited | Benefits seen mainly in mice; little human safety data |
| BPC-157 & TB-500 | Not approved; WADA-prohibited in sport | Minimal | Mostly animal data; theoretical angiogenesis/cancer concern unresolved |
| NAD+ (NMN/NR) | Precursors sold as supplements (varies by country) | Mixed | Reliably raises NAD+; functional benefits in humans unproven |
| GHK-Cu | Established topical cosmetic ingredient | Reasonable (topical) | Good evidence for topical skin use; injectable use is research-only |
| KLOW blend | Not approved; research chemical | None on blend | Four unapproved peptides combined; untested as a mixture |
| GLOW blend | Not approved; research chemical | None on blend | Three unapproved peptides combined; untested as a mixture |
Compounds sold for research use have no regulatory oversight of what is actually in the vial. Independent testing has repeatedly found research-grade products that are underdosed, contaminated, or mislabelled. With injectables, sterility is a serious additional concern.
Some of these compounds may eventually prove useful. But "not yet shown to be harmful" is very different from "shown to be safe." For most compounds here, the long-term human safety studies simply have not been done. Strong online enthusiasm fills that vacuum with anecdote, which is not evidence.
BPC-157 and TB-500 are on the World Anti-Doping Agency prohibited list. Any athlete subject to testing risks sanctions, regardless of how a product is labelled.
Combining compounds (KLOW, GLOW) stacks uncertainties: no interaction data, and no way to attribute any effect, good or bad, to a specific ingredient.