Table 1.

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

Silibinin (Sigma)Silymarin (Aldrich)Silymarin (Indena)Silymarin (Madaus)
Silybin A46.914.813.116.0
Silybin B49.623.321.623.8
Isosilybin A4.96.66.4
Isosilybin B2.13.94.4
Silydianin0.89.416.7
Silychristin16.515.511.6
Isosilychristin0.61.52.2
Taxifolin1.72.21.6
  • 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.