SAMe is a molecule that is made naturally in the body from homocysteine and folate. It can also be made in a lab and taken in supplements.

SAMe is involved in the formation, activation, and breakdown of other chemicals in the body, including hormones, proteins, and certain drugs. The body uses it to make certain chemicals that play a role in pain, depression, liver disease, and other conditions.

People most commonly take SAMe for depression and osteoarthritis. It is also used for anxiety, liver disease, fibromyalgia, schizophrenia, and many other conditions.

SAMe has been available as a dietary supplement in the US since 1999, but it has been used as a prescription drug in Italy, Spain, and Germany for many decades.