Life Extension - Vitamin B3 Niacin, 500mg - 100 caps Free UK P&P
£14.75
Niacin is the only B vitamin that can be synthesized in the liver from the amino acid tryptophan — on average, 1 mg of niacin can be synthesized from the ingestion of 60 mg of tryptophan. Life Extension - Vitamin B3 Niacin.
