Amino Acid Supplementation

5-HTP is preferred over L-tryptophan because it cannot form quinolinic or kynurenic acid and crosses the blood-brain barrier more readily. A well-formulated amino acid blend has negligible caloric impact compared to whole protein, so it provides structural support without substantially interfering with fat burning or autophagy. The recommended strategy is to introduce amino acid supplementation starting on day 4 of a prolonged fast to preserve muscle while maximizing early autophagy. Serum tryptophan is not a reliable direct indicator of brain tryptophan because many amino acids compete for blood-brain barrier transport and frequently outcompete tryptophan. Free-form amino acids are absorbed immediately because the liver does not need to process them, unlike whole proteins. Low serum tryptophan indicates insufficient precursors for serotonin synthesis. Niacinamide inhibits tryptophan pyrrolase, the hepatic enzyme that breaks down tryptophan, thereby increasing the effectiveness of supplemental tryptophan. Vitamin B6 deficiency directly reduces GABA production and lowers the seizure threshold. For cancer patients, amino acid introduction should be delayed as long as possible becaus…