RU58841 Guide
Topical Anti-Androgen for Hair Loss 2026
Complete guide to RU58841 — the research topical anti-androgen that blocks DHT at scalp androgen receptors.
Topical Anti-Androgen: DHT Blocker at the Scalp (Research Use 2026)
RU58841 is a research topical anti-androgen applied directly to the scalp that locally blocks dihydrotestosterone (DHT) at androgen receptors in hair follicles — halting androgenetic alopecia progression without the systemic side effects of finasteride or dutasteride.
What Is RU58841?
RU58841 (PSK-3841) is a non-steroidal anti-androgen originally developed for topical application in the 1980s-90s. It functions as a high-affinity androgen receptor (AR) antagonist — binding scalp AR with ~3-4x the affinity of DHT without activating the receptor. This competitive inhibition prevents DHT from signaling hair follicle miniaturization. Unlike systemic anti-androgens (finasteride, dutasteride), which reduce serum DHT levels and carry sexual side effects, RU58841 acts locally at the scalp with minimal systemic exposure. It is a research chemical — not FDA approved — but is widely used in the hair loss community as a hair-preserving adjunct.
Most widely used topical concentration in research protocols
Minimal systemic DHT suppression — primarily scalp-level action
Maintenance of hair density requires consistent long-term use
Key Biohacking Mechanics
Dosing Protocol
Side Effects & Safety
Vital Protocol FAQs
Guide FAQs
Complete guide to RU58841 — the research topical anti-androgen that blocks DHT at scalp androgen receptors.
Yes. Shotlee supports tracking Ru58841 doses, side effects, and health metrics. It is free to use.
Track Your Ru58841 Protocol in Shotlee
Free dose logging, side effect tracking, and health metric monitoring for your complete protocol.