Trigonella foenum-graecum seeds (Fenugreek seeds; the main active component of this plant) tend to contain:
- Trigonelline, a betaine molecule also found in high levels in alfalfa and coffee[12]
- 4-hydroxyisoleucine[13] and its precursor, 2-oxoglutarate.[14]
- Protodioscin[15] similar to Tribulus Terrestris
- The two Trigoneosides, Trigofaenoside A and Glycoside D[15][16]
- Diosgenin[15][17] and Yamogenin[15][18][18]
- GII, a compound currently unnamed[19]
- 3-hydroxy-4,5-dimethyl-2(5H)-furanone (HDMF; aka. sotolon), the causative agent for a maple syrup scent of body excretions[20][21]
- Small phenolics such as Protocatechuic acid at 85.50ng/mg (ethyl acetate extract) or 31.25ng/mg (water extract),[22] quinic acid at 15.97ng/mg (ethyl acetate extract) 165.55ng/mg (water extract),[22] and gallic acid at 3.93ng/mg (ethyl acetate extract) or 3.10ng/mg (water extract)[22]
- Apigenin-7-O-glycoside (1955.55ng/mg in the ethyl acetate extract[22])
- Luteolin-7-O-glycoside (725.50ng/mg in the ethyl acetate extract[22])
- Vitamin C at 576.50ng/mg (ethyl acetate extract[22]) and less in the water extract (6.82ng/mg[22])
- Minerals such as potassium (603+/-15mg/100g[23]), Magnesium (42+/-5mg/100g[23]), calcium (75+/-9mg/100g[23]) Zinc (2.4+/-0.2mg/100g[23]), Iron (25.8+/-1.2mg/100g[23]), and both Manganese and Copper (0.9+/-0.1mg/100g[23])
Fenugreek has been noted to also possess trypsin and chymotrypsin (protein digestive enzyme) inhibitors.[24][25]
A fenugreek crude ethyl acetate extract appears to have the highest antioxidant properties of all fenugreek extracts.[22]
Dietary carbohydrates and fibers (the latter of which constitutes 6.28-9.3% of total seed weight[26]) include:
- Soluble fibers as galactomannins[27], with a galactose:mannose ratio of 1.5:1[28]
The fatty acid component of Fenugreek (4.51-7.1% of dry weight overall[23][26]) consists of mostly oleic (16.3%), linoleic (50%), and linolenic acids (24.4%).[29]
Fenugreek oil (aromatic component) contains Neryl acetate (17.32%), Camphor (16.32%), β-Pinene (15.05%), β-caryophyllene (14.63%), 2,5-dimethylpyrazine (6.14%), Geranial (4.81%), 6-methyl-5-hepten-2-one (4.48%), 3-octen-2-one (4.32%), α-selinene (4.04%), α-Terpineol (2.77%), α-Campholenal (2.63%), α-pinene (2.61%), and γ-Terpinene (2.08%).[30]
The protein content of the seeds themselves appear to be 12.9-28.4%, but is highly variable.[23][26]