Acetyl-L-carnitine (ALC) has been hypothesised that it may help reduction in testosterone levels, but there are no good studies to show this. It is also claimed that ALC may have protective effects on brain and heart tissue and may even be involved in controlling blood lipids.
As a bodybuilding supplement, it is claimed to have anti-catabolic effects. These claims are unsubstantiated, and, judging by the fact that I have never heard of anyone who has used it (and I know a lot of bodybuilders who will try all sorts of supplements), means that its probably not worth trying.
"Those who rave about carnitine's effects, are probably on a calorie controlled diet anyway so would be losing weight."
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