Milk Thistle: What It Is and How to Use It

Milk thistle (Silybum marianum) is a flowering plant in the daisy family, recognizable by its spiky purple blooms and distinctive white-veined leaves. The seeds are the part most commonly used in herbal preparations, and the plant has been part of European herbal traditions for over 2,000 years. You can find it in the bulk herb section at William's Natural Foods, 12249 San Pablo Ave, Richmond, CA 94805.

Available in Bulk

We carry milk thistle in our bulk herb section so you can grab the exact amount you want — from a spoonful to try it in a tea blend to a full bag for your pantry. Our staff can help you find it in the bulk bins and compare the forms we stock.

What We Carry

• Milk thistle seed whole — the dried seeds, the traditional form for teas and decoctions.
• Milk thistle seed powder — ground seeds for blending into teas or smoothies.
• Milk thistle tea blends — pre-mixed herbal teas that include milk thistle among their ingredients.

Frequently Asked Questions

What part of the plant is used?

The seeds are the primary part used in herbal preparations, though the leaves and flowers are also edible. The seeds contain silymarin, a group of compounds that has been the focus of most scientific research on the plant. Whole seeds are traditionally simmered or ground before use.

What is milk thistle traditionally used for?

Milk thistle has one of the longest documented histories in Western herbalism — the ancient Greek physician Dioscorides wrote about it in the first century AD, and it was traditionally used to support liver health. Modern research on its effects is ongoing and results are mixed. It remains one of the most widely used herbs in its category.

How do you prepare milk thistle seeds?

Whole seeds are hard, so they are usually crushed or ground before brewing, then simmered for 10–15 minutes to make a decoction. The resulting tea is mild and slightly bitter. Many people blend milk thistle with stronger-flavored herbs like peppermint or licorice root to improve the taste.

Why are the leaves white-veined?

According to legend, the white markings on milk thistle leaves come from a drop of the Virgin Mary's milk — which is how the plant got its common name. The botanical explanation is simply variegation in the leaf tissue, but the story has been attached to the plant for centuries.

Did you know? Milk thistle is one of the most studied herbs in the world — the U.S. National Center for Complementary and Integrative Health notes it among the most commonly used herbal supplements, with clinical research dating back decades (source: NCCIH, "Milk Thistle" fact sheet).

Visit William's Natural Foods at 12249 San Pablo Ave, Richmond, CA — open Monday through Friday 9 AM to 7 PM, Saturday 9 AM to 6 PM, and Sunday 10 AM to 5 PM. Our staff are happy to help you find milk thistle in the bulk section and answer questions about the forms we carry.

This guide is for general information only and is not medical advice. Talk to your doctor or a qualified health professional about any health questions.