L (levo) lysine...: ...is a natural amino acid, present in greater or lesser amounts in all proteins. Sold as a health supplement, but there are no proved benefits. Sometimes recommended by some non-scientific sources for herpes, but lysine has no benefit in treating or preventing herpes outbreaks. The dose probably doesn't matter much; take whatever the label says. It would be difficult to take enough to be harmful.
Answered 10/30/2017
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