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L-carnitine, a vitamin-like amino acid helps energize your mind and promote concentration by maintaining healthy brain functions like neurotransmitter production. The nutrient is found naturally in meat and dairy products—red meat being nature’s richest source. Aside from their brain-boosting potential, L-carnitine supplements are widely used by athletes to promote healthy energy levels (much like B complex vitamins), as this important amino acid is put to use by muscles throughout your body to grow stronger and leaner. You can read more about L-carnitine in the customer reviews for our selection of supplements listed below.