Urolithin A

Food or supplementMeasured in people, not heightBy mouthNutrient
A compound gut bacteria make from pomegranate and walnuts, sold as a supplement. It clears out damaged mitochondria.
A metabolite made by gut bacteria from the ellagitannins in pomegranate and walnuts, sold as a supplement. It induces mitophagy, the clearance of damaged mitochondria specifically.
Risks. Tolerated in adult trials with no particular safety problem found. The issue is the evidence, much of it from the company selling it, and nothing at all in children.
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Educational content, not medical advice. Nothing here is a recommendation to take or stop taking anything — talk to a doctor about your own situation.