The standard effective dosage for most adults is between 200mg to 420mg of silymarin daily, typically divided into two or three doses. However, the precise amount depends on your health goals and the concentration of the extract you are using.
Milk Thistle Dosage Summary Table
| Health Goal | Daily Dosage (Silymarin) | Frequency |
|---|---|---|
| General Liver Support | 140mg – 210mg | 1-2 times daily |
| Intensive Liver Support | 420mg – 600mg | 2-3 times daily |
| Metabolic & Blood Sugar Support | 200mg – 600mg | 3 times daily |
Research suggests that consistency is key. Clinical studies typically observe results after 8 to 12 weeks of daily use. Always check the label for the "standardised silymarin" content rather than just the total herb weight, as this is the active component that supports liver function.
Understanding Your Dosage: Extract vs. Silymarin
When shopping for milk thistle, you'll see large numbers like "4000mg" or "1000mg" on the label. This often refers to the "herb equivalent" or the total extract weight. The most important figure is the standardised percentage of silymarin.
For example, Napiers Milk Thistle 90 Capsules (4000mg) contains a concentrated 20:1 extract standardised to a minimum of 80% silymarin. This high potency means you often only need one capsule daily for meaningful support.
Daily Use and Safety
Milk thistle is generally well-tolerated when taken as directed. According to UK health trends and herbal guidance from the Holland & Barrett 2026 report, "supplement stacking" for liver health is becoming more common, but it's important to stick to recommended ranges to avoid digestive upset.
- Best time to take it: Most herbalists recommend taking milk thistle with a meal to improve absorption and reduce the risk of a mild laxative effect.
- Cautions: If you are pregnant, breastfeeding, or taking medication for diabetes or liver conditions, consult your GP before starting a new supplement regimen.
