💊 What it does
Milk thistle (Silybum marianum) is a flowering plant whose seeds contain silymarin — a complex of flavonolignans (primarily silybin, silychristin, and silydianin) with hepatoprotective (liver-protecting) properties. Silymarin acts as an antioxidant, reduces liver inflammation, promotes liver cell regeneration, and may inhibit toxin uptake by liver cells. It has the strongest evidence for alcoholic liver disease, non-alcoholic fatty liver disease (NAFLD), and liver toxicity from medications or chemotherapy. It has a very long history of traditional use for liver and gallbladder conditions.
👤 Who needs it
People with liver conditions — alcoholic liver disease, NAFLD, hepatitis. Those taking medications with known liver toxicity (certain antibiotics, statins, antifungals) who want liver protection support. People who consume alcohol regularly. Anyone post-chemotherapy seeking liver recovery support. Those with gallbladder issues (consult GP first — milk thistle stimulates bile flow).
🥦 Food sources first
Milk thistle seeds are the source. They are not commonly eaten as a food in the UK. There is no practical food-based way to achieve therapeutic silymarin doses.
🗓 When to supplement
When liver health is a specific concern. As supportive care during or after medication use with known liver effects. For people with NAFLD alongside dietary and lifestyle changes. For regular alcohol users.
🏷 Best form to look for
Standardised extract to 70–80% silymarin content. Phosphatidylcholine-bound silymarin (Siliphos, Silipide, Milk Thistle Phytosome) has dramatically better bioavailability than standard silymarin — the phosphatidylcholine complex is absorbed as a fat and delivers silymarin more effectively to liver cells.
⏰ When to take it
With meals. Twice daily dosing is effective. Consistent use over at least 8–12 weeks is needed for liver condition applications.