Acetyl Methionine
AKA “N-Acetyl-L-methionine, N-Acetylmethionine, Acetyl-L-methionine, Methionamine, Thiomedon, Acetylmethionine, L-(N-Acetyl)methionine, L-Methionine”
Synthetic
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Ingredient Facts
Acetyl methionine
AKA: N-Acetyl-L-methionine, N-Acetylmethionine, Acetyl-L-methionine, Methionamine, Thiomedon, Acetylmethionine, L-(N-Acetyl)methionine, L-Methionine
Synthetic · Skin Conditioning | Antioxidant · EWG: 1
Plant-Derived
Antioxidant
Skin Conditioner
Amino Acid
Synthetic
Clean
A naturally-derived amino acid that helps strengthen and condition skin, promoting a smoother, more resilient complexion.
Solubility 307000
Formula
C7H13NO3S
Mol. Weight
191.25
CAS #
1115-47-5, 65-82-7
Form
Powder
Plant-Derived
Synthetic. Derived from the amino acid methionine, a compound synthesized from petrochemical or fermentation-based sources. Produced through acetylation of methionine using acetic anhydride or acetyl chloride in chemical synthesis.
Function
Skin Conditioning | Antioxidant
Benefits
Locks in moisture
Traditional Use
A synthetic acetylated amino acid developed for cosmetics to improve absorption and stability. Created as a modified form of the essential amino acid methionine for enhanced skincare delivery.
Skin Types
all-skin-types, gentle
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score1
CIR Safety Findings
ewg-1, medical-approval, pregnancy-nursing-safe, all-shades-safe, Not a Sensitizer
Concentration Guide
Industry Max
Industry typically uses up to 1.0% in leave-on products (14 products reported). Source: CIR Safety Assessment (CIR Seq 645).
Regulatory Agencies
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR