Vitamin U (3493-12-7), a natural methionine derivative, is a key gastroprotective agent and pharmaceutical raw material. Known as an “anti-ulcer factor,” it treats gastric and duodenal ulcers by promoting gastric mucosal epithelium regeneration, accelerating ulcer healing, and protecting mucosa from ethanol/oxidative damage via free radical scavenging. It is widely used in ulcer medications, gastrointestinal health supplements, and functional food additives. In cosmetics, it acts as a skin conditioner and repair agent, supporting barrier recovery. As a methionine analog, it serves as a biochemical research tool for studying sulfur amino acid metabolism and mucosal repair mechanisms. With high safety and stability, it is indispensable in digestive health products, pharmaceuticals, and cosmetic formulations.

Vitamin U is a low-toxicity, mild irritant with good safety profiles. No severe acute toxicity reported; oral LD50 in rats >5000 mg/kg. Skin/eye contact may cause mild irritation; avoid prolonged exposure. Wear gloves, goggles, and N95 mask during handling; avoid inhalation/ingestion. Incompatible with strong oxidants; thermal decomposition emits toxic nitrogen/sulfur oxides. Store separately from oxidants in cool, dry, dark area; keep sealed to prevent moisture absorption. Dispose of waste per local regulations; no special environmental hazards if handled properly.