Arginine (and) Serine (and) Threonine (and) Glutamic Acid

This specific blend of four amino acids — Arginine, Serine, Threonine, and Glutamic Acid — is designed to mimic the natural moisturizing factor (NMF) profile found in healthy stratum corneum, where free amino acids play a critical role in maintaining skin hydration and barrier integrity. Arginine contributes wound-healing and circulation-boosting properties while also acting as a pH buffer; Serine and Threonine are hydroxyl-bearing amino acids that enhance water-binding capacity; and Glutamic Acid, an acidic amino acid, supports the skin's natural acid mantle and osmoregulation. Formulators choose this complex over single amino acids to replicate the synergistic, multi-functional moisturizing and conditioning environment of healthy skin, making it particularly valuable in barrier-repair creams, sensitive skin care, and anti-aging serums.