L-tryptophan is an essential amino acid that the body cannot produce on its own, so we must obtain it through our diet. It plays a key role as a precursor to serotonin and melatonin. Serotonin is a neurotransmitter that influences mood, while melatonin is responsible for regulating sleep and wakefulness. Natural sources of tryptophan include eggs, milk and dairy products, poultry, and
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