Yogurt has the highest lysine content of any common food, and it can make for a good cold sore remedy, says Jim Roach, MD, founder of the Midway Center for Integrative Medicine, Midway, KY.

Speaking at the Healthy Medicine Academy’s 2012 Advances in Cancer Strategies conference, Dr. Roach said that lysine is important for strengthening the interlacing between cells comprising mucous membranes, which may explain why many people find short-term high doses of the amino acid effective in staving off herpes outbreaks.

Goat milk yogurt, while still rich in lysine, contains roughly half the casein in Cow milk yogurt, making it a much better option for casein sensitive people.

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