SAMe donates methyl groups (-CH₃) to over 200 biochemical reactions: (1) Neurotransmitter synthesis — methylation is required for serotonin, dopamine, and norepinephrine production (catechol-O-methyltransferase, COMT, requires SAMe); (2) Cartilage repair — SAMe provides sulfur for glycosaminoglycan (GAG) synthesis in chondrocytes AND reduces inflammatory cytokines (IL-1β, TNF-α) in joints; (3) Liver function — SAMe is required for hepatic phospholipid synthesis (phosphatidylcholine) and glutathione production; liver disease depletes SAMe, creating a vicious cycle; (4) DNA/epigenetic — SAMe methylates DNA (CpG islands), regulating gene expression. After donating its methyl group, SAMe becomes homocysteine (which is recycled back to methionine via B12/folate pathway).
Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.