One important thing I keep forgetting to recommend to people who are taking Milk Thistle to treat their psoriasis is to take it with a bit of Lecithin, since Lecithin will greatly enhance Milk Thistle's liver protection effects.
A 400-500 mg capsule of Lecithin should be sufficient.
Taking Milk Thistle this way is know as a lipotropic combination.
Lecithin is considered an excellent source of choline, one of the B vitamins. Once in the body, a key component of lecithin--phosphatidylcholine--breaks down into choline. Now available in dietary supplement form, phosphatidylcholine (PC) might be thought of as a purified extract of lecithin. It is commonly recommended for treating liver, nerve, and a variety of other conditions, including multiple sclerosis and memory loss.