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2-Amino-4-methylselanyl-butanoic acid; l-selenomethionine;seleno-l-methionine;
thallium ethylsufate; l-seleno-l-methionine; l-(+)-selenomethionine

Technical Data

CAS Number: 3211-76-5
Molecular Formula: C5H11NO2Se
Molecular Weight: 196.1
EC Number: 608-705-0

FabriChem Specifications

IdentificationPositive for Se
AppearanceWhite crystalline powder
Loss on DryingNMT 7.0%
pH6 - 8.5
Particle Size100.0% through
60 Mesh
NLT 90.0% through
80 Mesh
Se Content0.5 – 0.75%
DCP ContentNLT 98.0%
Bulk DensityReport Only
LeadNMT 1 ppm
ArsenicNMT 1 ppm
MercuryNMT 1 ppm
CadmiumNMT 1 ppm
Total Plate CountNMT 3,000 CFU/g
Yeast & MoldNMT 300 CFU/g
E. ColiNegative
SalmonellaNegative / 25g
Staph. AureusNegative
Pseudomonas Negative

Molecular Structure



Selenomethionine is a naturally occurring amino acid containing selenium. The L-enantiomer of selenomethionine, known as L-selenomethionine, is a common natural food source of selenium and is the predominant form of selenium found in Brazil nuts, cereal grains, soybeans, and grassland legumes. Selenomethionine is a compound shown to increase expression of glutathione peroxidase. Glutathione peroxidase protects cells from oxidative damage.