Silymarin is extracted from the milk thistle seeds and available as a standardized extract.In 2019, Cancer Research UK stated: “We need a lot more research with reliable clinical trials before we can be sure that milk thistle will play any part in treating or preventing cancers.

Milk Thistle Extract is a species of thistle. It has various common names including milk thistle,blessed milkthistle, Marian thistle, Mary thistle, Saint Mary’s thistle, Mediterranean milk thistle, variegated thistle and Scotch thistle (though not to be confused with Onopordum acanthium or Cirsium vulgare). This species is an annual or biennial plant of the family Asteraceae. This fairly typical thistle has red to purple flowers and shiny pale green leaves with white veins. Originally a native of Southern Europe through to Asia, it is now found throughout the world.

【Product Name】Milk Thistle Extract
【Plant Origin】Silybum marianum (L.) Gaertn
【Specification】Silymarin UV80%/Silymarin HPLC40%-80%; Water-soluble Silymarin UV 20%-45%
【Active Ingredients】

https://www.cabeenherb.com/silymarin/

Silybin
Molecular Formula:C25H22O10
Mol. wt.:482.43
CAS No.: 22888-70-6
Structural Formula:

Silychristin
Molecular Formula:C25H22O10
Mol. wt.:482.43
CAS No.: 33889-69-9
Structural Formula:

Silydianin
Molecular Formula:C25H22O10
Mol. wt.:482.43
CAS No.: 29782-68-1
Structural Formula:

Isosilybin
Molecular Formula:C25H22O10
Mol. wt.:482.43
CAS No.: 72581-71-6
Structural Formula:

https://en.wikipedia.org/wiki/Silybum_marianum#Chemistry