With many other supplement manufacturers, it can be tough to determine whether you're in fact getting what you paid for. BRI brings you 500mg of pure L-Tryptophan in every veggie capsule. This is the same compound found in turkey commonly believed to promote normal sleep -- now you can achieve that effect anytime you need to with BRI tryptophan. In addition, this can also promote immune system efficiency. A typical serving of L-Tryptophan is 1500mg, although we recommend you start with 500mg and increase from there if necessary. We manufacture our L-Tryptophan capsules right here in the US in our state-of-the-art, FDA-inspected facility and verify the ingredients in each capsule with a third party to guarantee the utmost quality. If you're not 100% satisfied with your supplement, we'll refund 100% of your purchase price. It's the BRI way.