The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
It has strong effects on rates of pregnancy and sperm quality. So clearly carnitine is doing lots of different things and lots of different cells. It's impacting sperm motility. They're in a large number of studies supporting that.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
And there is evidence from quality peer reviewed studies showing that acetylcarnitine supplementation can also be beneficial for women's fertility in ways that it affects perhaps we don't really know the mechanism, health and status of the egg or egg implantation.
the likelihood of fertility-- or pregnancy, rather-- the likelihood of sperm being forward fast swimmers as opposed to twitchers or immotile and having proper morphology-- all those measures has been demonstrated to be significantly improved by the ingestion of L-carnitine.