AICAR
Classic AMPK activator in the lab; in sports it is a doping issue, not a proven shortcut to cardio.
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Quick summary
AICAR (acadesine) is a nucleoside that is phosphorylated to ZMP and mimics AMP, activating AMPK. In mice, it became popular as “exercise in a pill”. In humans, serious clinical development was mostly for cardioprotection in surgery (with mixed results; the large RED-CABG trial was stopped for futility) and some hematological contexts — not marathons or cutting.
Studied for
How it works
ZMP → AMPK activation → increased fatty acid oxidation, glucose uptake, mitochondrial biogenesis in models. It also has AMPK-independent effects (systematic review PMC8147799).
What the research says
Reviews: AICAr as an AMPK tool with caveats. Historical Clinical: acadesine in CABG — early signals not confirmed in a large phase 3. Human Performance: no solid evidence of endurance improvement as a research product. Anti-doping: detection methods and AICAr/SAICAr ratio in sports forensic literature.
Evidence level
C — cardiac/hematological trials as acadesine; D for popular performance/fat loss
What's most reported
- In animals: endurance / metabolism
- In historical clinical use: unconfirmed cardiac signals
- In sports: substance of anti-doping interest
Common side effects
In clinical trials of acadesine, events were reported according to indication (incl. renal toxicity in some onco/heme programs). Profile of “exercise mimetic” vials: not characterized. High regulatory/sports risk.
Combines / does not combine
Do not stack with other prohibited metabolic modulators. Irrelevant as a gym “supplement”.
Frequently asked questions
Not in humans with credible evidence.
Because it activates exercise adaptation pathways and has been detected in doping contexts.
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Educational content. Not medical advice or usage guidelines. Research products are not approved medications unless otherwise indicated.