Puritan's Pride Supplements are considered some of the best and most reasonable on the market. Puritan's Pride Milk Thistle Seeds Extract comes in gel caps. The gel caps contain 250 mg of milk thistle seed extract that is standarized to contain 80% silymarin the active ingredient in milk thistle seeds. Milk thistle seeds come from the milk thistle plant and are notorius for there effect on the liver.The liver is one of the body's organs which processes enviromental toxins, legal and illegal drugs and chemicals in our bodies. It gets a long hard workout over the years and milk thistle seed helps to protect it. According to James A. Duke PhD.'s "The Green Pharmacy" milk thistle seeds not only protect the liver but also have anti-aging qualities, can treat gall stones and psoriasis and warts. I personally have been taking Puritan's Pride Milk Thistle Seeds Extract for 8 years now. Due to some serious illnesses and the drugs I must take my liver could be compromised but it is functioning fine. I recommend this product.