Can green tea help prevent the flu?
Find out if green tea can help with your cold & flu symptoms - drinking, gargling or taking supplements. ConsumerLab.com's answer explains.
Cystine, which is formed from two cysteine molecules joined together, is more stable than cysteine, but may not be absorbed as well. This amino acid is also a component of hair, skin and nails. However, there is no evidence that supplementing with cystine improves hair, skin or nail health, and it is rarely used as a dietary supplement.
See ConsumerLab.com's Review of Biotin Supplements for tests of other products for hair and nail health, and the Review of Muscle Enhancers for more information about other amino acid supplements.
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