Collagen vs. Glycine

Glycine may not be a straightforward substitute for collagen due to the presence of hydroxyproline in collagen, which may impact skin health. However, the data supporting collagen's benefits for skin, hair, and nails remains inconclusive, prompting caution before investing in supplements. While collagen is low in essential amino acids like leucine, other protein sources such as whey and eggs offer significantly higher levels, making them more suitable for post-workout recovery.