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Anabolic Steroids: Andriol (Testosterone Undecanoate)

Andriol is an oral form of testosterone. Instead of being methylated like most other oral steroids, the undecanoate ester of Andriol significantly increases its fat solubility. Instead of being absorbed into the blood stream through the liver, Andriol is actually absorbed in the small intestine and then transported through the lymphatic system. Andriol in an oil suspension inside of a soft gel to further enhance absorption.

Andriol may appear to be the perfect non-liver toxic form of oral testosterone, but unfortunately even with the undecanoate ester it is still not very bioavailable. Anecdotal reports have found Andriol to be somewhat effective at best, likely due to a low level of actual testosterone getting into the bloodstream. The undecanoate ester may be a big step ahead just putting testosterone in a capsule which would be completely ineffective, but this delivery system is not nearly as effective as C-17 methylation.

A dosage of is typically required to see results from Andriol. Because of its very short half life, Andriol should be dosed 3-4 times per day to keep blood levels of testosterone as constant as possible. Andriol users can expect gains similar to injectable testosterone, but on a much smaller scale.

Andriol has never been available over the counter, and will only be found on the black market. In choosing between black market drugs, using an injectable testosterone would me much more effective. While Andriol may not be available over the counter, there are still many prohormones available that are completely legal but will still deliver results. For 100% legal and effective prohormones, click here.


1. Roberts, S (2009). Anabolic Pharmacology.

2. Llewellyn, W (2006). Anabolics 2006. Jupiter, FL: Body of Science.

ABOUT THE AUTHOR: Cassie is a chemistry major and national level bodybuilder. Questions or comments? Talk to Cassie on the FORUM or on FACEBOOK.

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