Glycine: This amino acid is known for its ability to enhance collagen production, which is crucial for maintaining skin elasticity and firmness. Glycine also aids in wound healing and supports the skin’s natural defense mechanisms.[1]
https://thedermreview.com/glycine
Park, J.I., et al., Oral Administration of Glycine and Leucine Dipeptides Improves Skin Hydration and Elasticity in UVB-Irradiated Hairless Mice. Biomol Ther (Seoul), 2017. 25(5): p. 528-534.