NOW Foods Supplements, (L-Lysine Hydrochloride) 1,000 mg, Double Strength, Amino Acid, 100 Tablets

Customers find this lysine supplement to be of good quality and effective, helping with cold sores and immune system support. They report feeling better after a few days of use and note that it doesn't cause stomach discomfort. However, the product receives mixed feedback regarding its size and swallowability, with many customers finding the pills too large and difficult to swallow.