AICAR: What the Evidence Actually Shows

Grade CWADA prohibited

The short version

An AMPK activator, sometimes called an exercise mimetic.
Famous for a 2008 mouse study showing improved endurance without training.
Explicitly prohibited by WADA and one of the compounds anti-doping labs test for.
Poor bioavailability. The doses used in research are far larger than most people assume.
No approval for performance or metabolic use.

The mouse study everyone cites

In 2008, sedentary mice given AICAR showed a meaningful increase in running endurance without training. It was a striking result and it generated enormous coverage, including immediate concern from anti-doping authorities.

What followed was less exciting. The effect has been harder to translate, the doses involved were substantial, and the human data has not materialised in the seventeen years since.

The practical problems

AICAR has poor oral bioavailability and a short half life, which means the quantities needed to approach research-level exposure in a human are large and expensive. It has also been studied clinically in other contexts, including cardiac protection, without becoming an approved therapy.

The doping angle

AICAR appears on the WADA Prohibited List and is actively tested for. Anyone competing in a tested sport should treat this as a certainty rather than a risk.

What this will not do

It will not replace training. The mouse result has not translated.
It will not pass a drug test.

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