RU58841 and gray-market peptides
Popular on social media and sold as "research chemicals." Never approved, with no completed human safety trials.
Experimental evidenceNot approved
What to do instead
Skip it. Ask a dermatologist about topical finasteride instead. Copper peptide (GHK-Cu) serums are a lower-risk cosmetic add-on, but the evidence for hair is weak.
Smart pathNot recommended
Prices are estimates based on typical US cash prices. They change often, so check before you buy.
- Evidence
- Experimental. Early research only. Often oversold.
- How it works
- RU58841 is a topical anti-androgen meant to block DHT at the scalp. It was studied in animals in the 1990s, but human trials were never completed. Injectable peptides like BPC-157 are often sold alongside it, with no evidence for hair loss.
- What results look like
- Animal studies and online anecdotes only. No reliable human data on how well it works or how safe it is.
- Time to results
- Unknown.
- Side effects and downsides
- Unknown long-term safety
- Users report low libido and fatigue, which suggests it reaches the bloodstream
- Sold as "not for human use," so purity and dose are not guaranteed
- Gray-market injectable peptides carry contamination and infection risk
- Best for
- Nobody yet. If you want to block DHT at the scalp, topical finasteride is the tested version of the same idea.
- Sources
- Battmann et al., 1994, J Steroid Biochem Mol Biol (RU58841, a topical antiandrogen)
- Pan et al., 1998, Endocrine (RU58841 in stumptailed macaques)
- FDA: BPC-157 flagged for safety risks in compounding (2023)
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