When our body produces enough of the neurotransmitter serotonin, we feel calmer. Our body makes serotonin from the amino acid tryptophan, and also from a natural amino called 5HTP, as a supplement, which is best taken at night. Dosage: take one tablet daily, preferably with an evening meal or a carbohydrate snack. Caution: Serotone is not suitable for pregnant or lactating women, or those taking appetite suppressants containing fenfluramine. Some drowsiness may occur if taken during the day. Do not take before long distance driving.