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Evidence from nine trials suggested a reduction in depressive symptoms with ALCAR (3 g/day for a median 8 weeks) compared to a placebo

One of the most important compounds for carnitine is Vitamin C, as its synthesis involves different vitamin C-dependent enzymes and its deficiency has a very negative effect on L-carnitine synthesis in the body

doi: 10.1016/S0140-6736(11)60321-8

2020: A systematic review confirmed ALCAR + L-carnitine significantly improved total sperm motility, progressive motility, and morphology at doses of at least 3 g/day, but did not affect sperm concentration or clinical pregnancy rates [5][48]

[ref] The highest sources of L-carnitine in the diet are meat and dairy products, with very little found in plant sources