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Table 1.

Composition (% of total material) of commercial milk thistle products

Silibinin (Sigma)Silymarin (Aldrich)Silymarin (Indena)Silymarin (Madaus)
Silybin A 46.9 14.8 13.1 16.0 
Silybin B 49.6 23.3 21.6 23.8 
Isosilybin A — 4.9 6.6 6.4 
Isosilybin B — 2.1 3.9 4.4 
Silydianin — 0.8 9.4 16.7 
Silychristin — 16.5 15.5 11.6 
Isosilychristin — 0.6 1.5 2.2 
Taxifolin — 1.7 2.2 1.6 
Silibinin (Sigma)Silymarin (Aldrich)Silymarin (Indena)Silymarin (Madaus)
Silybin A 46.9 14.8 13.1 16.0 
Silybin B 49.6 23.3 21.6 23.8 
Isosilybin A — 4.9 6.6 6.4 
Isosilybin B — 2.1 3.9 4.4 
Silydianin — 0.8 9.4 16.7 
Silychristin — 16.5 15.5 11.6 
Isosilychristin — 0.6 1.5 2.2 
Taxifolin — 1.7 2.2 1.6 

NOTE: Note that silymarin product composition totals are <100%; each of these products are labeled as 70% to 80% silymarin with the remainder consisting of uncharacterized polyphenols and aliphatic fatty acids such as oleic and palmitic acids.

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