maximum l carnitine per day dose of Characteristics included studies L- Carnitine Tartrate Supplementation for 5 – L-Carnitine Tablets for Energy Support

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Based on reading some of the websites it seems that their hypothesis is that because ALC is involved in the Krebs cycle in the mitochondria, which gets energy from fatty acids, that means ALC helps burn fat. There is not much in the scientific literature on this topic, but I did come across an article that found no difference in metabolic parameters in study participants taking L-carnitine versus controls (not exactly the same things as acetyl-L-carnitine, but they are used somewhat similarly in the body, there just isnt the extra acetyl group in the L-carnitine)

Short-term studies havent found acute safety issues, but because there are no long-term human studies, its safety over time is unknown

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"Carnitine." National Institutes of Health-Office of Dietary Supplements