A member asked:

Are there any side effects of l-lysine?

A doctor has provided 1 answer

High doses, maybe: Deficiency symptoms might include stomach cramps, diarrhea, hair loss weight loss, poor concentration, reproductive problems, kidney stones. It can interact with a number of antibiotics to lethal effect. It could cause severe allergic reactions, (swelling of lips and tongue, or throat closure, difficulty breathing) old people need it more than young. Athletes use it.

Answered 10/2/2017

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