THORNE Lysine, 500 mg Essential L-Lysine Amino Acid, 60 Capsules

Customers find the lysine supplement effective at preventing cold sores and boosting their immune system, with some reporting improved skin within a week. The product receives positive feedback for its ingredients, with one customer noting it doesn't contain magnesium stearate, and customers consider it worth the price. The capsule size and swallowability receive mixed reviews - while some find the smaller size convenient, others report difficulty swallowing them.