Anabolic steroidAndrogen19-nortestosteroneProhormone

Bolandiol

Also known as 19-Nortestosterone diol · Estra-4-ene-3,17-diol · Bolandiol

Written by enwyReviewed 15 Jul 20261 sources0 comments

A 19-nortestosterone prohormone (estra-4-ene-3beta,17beta-diol) that converts to nandrolone in the body. Marketed in supplements before regulation; limited human data, mostly from doping analysis and prohormone-conversion studies.

01 Overview

Bolandiol is a diol precursor to nandrolone, sometimes sold as '19-nor-DHEA'-type prohormone material. On administration it is metabolised toward nandrolone and its metabolites, which is why it produces nandrolone-type anti-doping findings.

Direct human trials are lacking. The compound is understood mainly through its conversion pharmacology and the well-characterised effects of its active metabolite, nandrolone.

02 Mechanism

Acts as a prohormone: enzymatic oxidation converts bolandiol to nandrolone, a 19-nor androgen-receptor agonist with strong anabolic and modest androgenic activity.

03 Dosing

Tier	Dose	Route	Notes
Anecdotal	50–200 mg/day	Oral	Prohormone-era ranges; conversion efficiency low and variable.

Ester comparison

Ester	Half-life	Injection freq.	Testosterone by mass

04 Effects

Effect	Magnitude	Evidence
Nandrolone-type anabolismProduces nandrolone metabolites; effect resembles low-dose nandrolone.	modest	Observational
Joint / recovery comfortUsers report nandrolone-like joint comfort, unverified.	unquantified	Anecdotal

05 Side effects

Effect	Severity	Frequency	Evidence	Countermeasures
HPTA suppressionConversion to nandrolone suppresses endogenous testosterone.	Moderate	Expected	Observational
Long-detectable metabolitesNandrolone metabolites (19-norandrosterone) are detectable for long periods.	Mild	Universal	Observational

06 Legal status

United States

Schedule III anabolic steroid

Nandrolone precursor captured under anabolic steroid law. · as of Jan 2026

07 References

Excretion of 19-norandrosterone after administration of nandrolone precursorsJournal of Chromatography B / doping analysis

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.