OS-01 EYE is the latest addition to the company’s lineup, and I just started testing it while writing this review. While I don’t have enough data yet to determine how well it works, it’s worth mentioning that OS-01 EYE has the highest concentration of the OS-01 peptide, followed by OS-01 FACE. That’s because the skin around the eyes is incredibly thin, sensitive and prone to showing visible signs of aging. On the flip side, the company’s body lotion has the least concentration of the OS-01 peptide.