L-Tryptophan is an essential amino acid, meaning the body cannot produce it and must obtain it through diet or supplementation. It serves as a precursor to serotonin and melatonin, neurotransmitters crucial for mood regulation, sleep, and relaxation. Source Naturals formulates this supplement to ensure high purity and quality, undergoing regular testing. The 500mg dosage is a common potency.

The primary ingredient is L-tryptophan (500mg per serving). Other ingredients may vary depending on the product form (capsule or tablet) and may include gelatin (for capsules), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate. Always check the product label for the most up-to-date and complete ingredient list. Some formulations also include added Vitamin B6