Lamberts Milk Thistle 2500mg. It takes a full 2.5 grams of whole milk thistle herb to produce 100mg of milk thistle extract, the amount found in just one of our tablets. We use a standardised extract from mature seeds, with a guaranteed level of 80mg silymarin per tablet. Silymarin is the active principle from the fruit of Milk Thistle (Silybum marianum). Milk thistle is one of the most extensively studied herbs in use today, with over 300 scientific studies on its chemistry and application, and is widely recommended by practitioners. Our convenient one a day Milk Thistle tablets are suitable for vegetarians and they are made in the UK to pharmaceutical standards of GMP.