Which plant's seeds are used to support liver health and contain silymarin?

The plant whose seeds contain silymarin and are used in traditional preparations for liver health is milk thistle. Milk thistle is Silybum marianum, a prickly plant recognizable by its purple flower heads and white-veined leaves.

Silymarin is not a single chemical but a mixture of related flavonolignans, including silybin, silychristin, and silydianin. Traditional extracts are made from the seeds, which contain approximately 4–6% silymarin. Because the seeds are difficult to dissolve in water, supplements commonly use concentrated extracts rather than ordinary tea.

Milk thistle has been used in European herbal medicine for centuries and is marketed for liver protection, including in connection with alcohol or hepatitis. However, clinical evidence has not established that it treats or prevents liver disease, so “supports liver health” describes the traditional and commercial claim rather than a guaranteed medical outcome. Turmeric, artichoke, and dandelion are also associated with herbal liver remedies, but they do not contain milk thistle’s characteristic silymarin complex.