Methionine
molecular structure · PubChem
AKA: DL-METHIONINE, 59-51-8, Racemethionine, Acimetion, Lobamine, Urimeth, (+-)-Methionine, DL-Methioninum, 2-amino-4-methylsulfanylbutanoic acid
Synthetic
Skin Conditioner
Hair Care
Clean
See also: L-Methionine (annotation moved to); Atovaquone (annotation moved to); D-Methionine (annotation moved to) ... View More ...
Solubility 32.7 mg/mL at 25 °C
Formula
C5H11NO2S
Mol. Weight
149.21
CAS #
59-51-8
Form
Powder
State
Solid; [Merck Index] Colorless or white solid; [ICSC] White powder; [Sigma-Aldrich MSDS]
Functions
Antistatic
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
Traditional Use
Essential amino acid identified in the early 20th century; incorporated into modern skincare products for its role in collagen synthesis and skin structure support based on biochemical research.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR