5-htp (5-hydroxytryptophan) is an amino acid that is a direct precursor of serotonin and an intermediate step between tryptophan and serotonin. Serotonin has been shown to improve sleep and mood as well as boosting weight loss; research has indicated that people with low levels of serotonin may be subject to sugar/carbohydrate cravings, vague muscle aches, tension headaches, and insomnia. In addition, they may be “missing” the signal to stop eating when full, and many find that they lose some weight while taking 5-htp even if no conscious attempt is made at losing. Since most actual muscle building is done during sleep, and since serotonin is beneficial to inducing a deeper, more relaxed sleep, 5-htp can be of great benefit to the bodybuilder. In addition, it can help ease the more minor nagging muscle aches that can be so distracting when trying to fall asleep.

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