which kind of acetyl l carnitine good for alzheimer's disease L-Carnitine 500 mg Capsules Acetyl L-Carnitine – Olympian Labs
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USA 90 , 33193323 (1993)

Anything else is marketing until proven otherwise Higher doses can cause GI issues for some people

2016 Oct;17(10):970-6
Enhanced Exercise Performance : L-carnitine has been shown to increase endurance and reduce fatigue during exercise
