CheckVegan

Is Penmesterol vegetarian?

Penmesterol

Vegetarian Vegetarian
Vegan Vegan

Penmesterol, also known as penmestrol, is a synthetic anabolic-androgenic steroid, the 3-cyclopentyl enol ether of methyltestosterone, developed in the early 1960s.

Also known as 17alpha-Methyltestosterone 3-cyclopentyl enol ether, 3-(Cyclopentyloxy)-17-methyl-androsta-3,5-dien-17beta-ol, Penmestrol
INCI name Penmesterol
CAS number 67-81-2
EC number 200-670-6
CosIng ID 81779
Last reviewed 10 July 2026

An ingredient is considered vegetarian if it avoids components derived from killing an animal.

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