murphyMethionine
AKA: DL-METHIONINE, 59-51-8, Racemethionine, Acimetion, Lobamine, Urimeth, (+-)-Methionine, DL-Methioninum, 2-amino-4-methylsulfanylbutanoic acid
Synthetic
Skin Conditioner
Hair Care
Clean
OriginMethionine is synthesized from acrolein and methyl mercaptan through catalytic chemical reactions. The compound is produced via industrial organic synthesis rather than extraction from natural sources.
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]
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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
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.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
1 study / 1 not irritating (CIR 607)
Not a Sensitizer
1 study / 1 not sensitizing (CIR 607)
Concentration Guide
Leave-on0.0001–0.005%
Rinse-off0.0001–0.07%
0%50%100%
CIR reported use · 2012 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR