N-acetylcysteine

Approved, for something elseHeight measured in peopleBy mouthSmall molecule
A cheap, long-approved drug that tops up the body’s own antioxidant, also sold as a supplement.
The cysteine donor that replenishes glutathione, approved as the treatment for paracetamol overdose and as a mucolytic, and sold widely as a supplement. It is the compound every antioxidant rescue experiment at the growth plate has used.
Risks. Well tolerated and long used, with nothing known about what it does to a growing skeleton.
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What has been measured, in whom, with every source, and what it does to the rest of you. And every article in the library.
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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.