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L-Leucine is a type of amino acid that plays a key role in protein synthesis. It's also an essential ingredient in many weight loss supplements, and it can help you build muscle mass. L-Leucine has been shown to increase the activity of an enzyme called mTORC1, which regulates cell growth and division. This may be one reason why L-leucine helps your muscles grow after exercise, when they're most receptive to taking on new proteins for repair and recovery.

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