S-Adenosyl-L-Methionine (SAMe): In Depth

What Is SAMe?

S-Adenosyl-L-methionine (also called S-adenosyl methionine, S-adenosylmethionine, SAMe, or SAM-e in the United States or ademetionine in Europe, and also often abbreviated as SAM and AdoMet) is a chemical that is found naturally in the body. SAMe is sold in the United States as a dietary supplement.

SAMe was discovered in the early 1950s. It’s made in the body from methionine, an amino acid found in foods. It has been found to regulate key functions in living cells.

Abnormal levels of SAMe in the body have been reported in liver diseases and depression. This prompted researchers to investigate whether SAMe might be helpful in treating these conditions. The idea that SAMe might be helpful for osteoarthritis came from studies of SAMe for depression. Some of the participants in the depression studies who also had osteoarthritis said their joint symptoms improved when they took SAMe.

What the Science Says About the Effectiveness of SAMe

SAMe has been investigated most extensively for depression, osteoarthritis, and liver diseases. For all three conditions, research has not conclusively shown that SAMe is helpful.

Depression

Osteoarthritis

Liver Diseases

Other Conditions

Safety and Side Effects of SAMe

• Information on the long-term safety of SAMe is limited because the participants in most studies took it only for short periods of time. However, in one study of alcohol-related liver disease, participants took SAMe for 2 years; in that study, no serious side effects were reported.
• People with bipolar disorder (an illness characterized by mood swings, from depression to mania) should not take SAMe for their depressive symptoms except under the supervision of a health care provider because SAMe may worsen symptoms of mania.
• Although SAMe has been used to treat cholestasis during pregnancy, its safety during pregnancy has not been established.
• SAMe may decrease the effects of levodopa (L-dopa), a drug used to treat Parkinson’s disease. It’s also possible that SAMe might interact with drugs and dietary supplements that increase levels of serotonin (a chemical produced by nerve cells), such as antidepressants, L-tryptophan, and St. John’s wort.
• There’s a theoretical concern about the use of SAMe by people who are immunocompromised (such as those who are HIV-positive). Immunocompromised people are at risk for Pneumocystis carinii infection, and SAMe enhances the growth of this microorganism.
• Side effects of SAMe are uncommon, and when they do occur they are usually minor problems such as nausea or digestive upsets.

NCCIH-Funded Research

Current studies supported by the National Center for Complementary and Integrative Health (NCCIH) are investigating:

• The role of SAMe in nonalcoholic fatty liver disease
• The possible roles of SAMe and an enzyme involved in its formation for colon cancer.

More To Consider

• Don’t use SAMe to postpone seeing a health care provider about a medical problem.
• Consult your health care provider about using SAMe supplements. If you’re pregnant or nursing a child, if you take medicine or other dietary supplements, if you have bipolar disorder or Parkinson’s disease, if you’re HIV-positive, or if you’re considering giving SAMe to a child, it’s especially important to consult your (or your child’s) health care provider.
• Take charge of your health—talk with your health care providers about any complementary health approaches you use. Together you can make shared, well-informed decisions.