Subtotal $0.00
Shop Now
A SAM-e supplement contains S-adenosylmethionine, a compound your body makes from the amino acid methionine and uses in hundreds of chemical reactions. It has been studied for decades for depression, osteoarthritis and liver disease, yet the National Center for Complementary and Integrative Health (NCCIH) says the evidence for all three is not conclusive. SAM-e can also interact with antidepressants and other medicines, and it may trigger mania in people with bipolar disorder. Here is what SAM-e is, what the research shows and who should be careful.
Peptide Labs sells no SAM-e supplement, and none of the products in our catalog list it. This article does not recommend any product. It is general information, not medical advice. If you are dealing with depression, talk to a clinician; if you are in crisis in the US, call or text 988.
Key Takeaways
- SAM-e is made in every cell from methionine and acts as the body's main methyl donor.
- It is sold in the US as a dietary supplement and is called ademetionine in Europe.
- Depression studies are numerous but mostly small and short; a 2016 Cochrane review drew no firm conclusions.
- Osteoarthritis and liver disease research is mixed or inconclusive.
- People with bipolar disorder, Parkinson's disease on levodopa, or on serotonin-raising medicines need medical advice first.
What is SAM-e?
S-adenosylmethionine goes by many names: SAMe, SAM-e, SAM, AdoMet and, in Europe, ademetionine. NCCIH explains that it was discovered in the early 1950s and is made in the body from methionine, an amino acid found in protein foods. A 2002 review in the American Journal of Clinical Nutrition describes it as present in all living cells and central to three pathways: methylation, transsulfuration and aminopropylation.
Methylation means handing a small chemical tag, a methyl group, to another molecule. The NIH Office of Dietary Supplements calls S-adenosylmethionine a universal methyl donor for almost 100 substrates, including DNA, RNA, proteins and lipids. Researchers became interested in it as a supplement after abnormal SAM-e levels were reported in liver disease and depression.
How SAM-e connects to folate and B vitamins
After SAM-e gives away its methyl group, the leftover molecule is converted to homocysteine. Turning homocysteine back into methionine, the raw material for new SAM-e, requires an enzyme that depends on vitamin B12, with folate supplying the methyl group. That is why SAM-e is often discussed alongside these vitamins. Our guides to vitamin B12 and methylfolate cover who may run low and why testing comes before supplementing.
SAM-e supplement research at a glance
NCCIH notes that some of the older studies used injected SAM-e, which may not act the same way as a SAM-e supplement taken by mouth. This table summarizes the main research areas.
| Area studied | What reviews found | Evidence quality |
|---|---|---|
| Depression | Many small, short trials; Cochrane 2016 found no firm conclusions | Low to very low |
| Add-on to antidepressants | One 73-person trial favored SAM-e; needs replication | Low, preliminary |
| Knee or hip osteoarthritis | Similar to NSAIDs in comparison trials; placebo trials inconsistent | Poor, inconclusive |
| Liver diseases | Animal data and conflicting human studies | Inconclusive |
| Quitting smoking | One trial found no effect on quit rates | Negative |
Depression research
NCCIH counts at least 40 human studies of SAM-e for depression. Many reported benefits, but most lasted only a few weeks, enrolled few people and were not of the highest quality. A 2016 Cochrane review pooled eight randomized trials with 934 adults with major depression. Compared with placebo as a stand-alone product, it found no strong evidence of a difference, based on very low quality evidence. Results were similar to the older antidepressant imipramine and to escitalopram, again with low quality evidence. One trial of 73 people who had not responded to an SSRI found that adding SAM-e beat adding placebo over six weeks, and its authors called the result preliminary.
The Cochrane authors concluded that firm conclusions are not possible and called for larger, better trials, with close attention to mania as a side effect. Depression is a medical condition that deserves a proper evaluation, and NCCIH advises against using SAM-e to put off seeing a provider. If you take an antidepressant, do not add SAM-e or stop your medicine without talking to your prescriber. Our St. John’s wort guide and saffron guide cover two other mood-related supplements and their own interaction issues.
Osteoarthritis research
NCCIH explains that the joint question arose by accident: some people in depression trials who also had osteoarthritis said their joints felt better. Trials comparing SAM-e with NSAIDs found similar pain relief and function, with fewer side effects on SAM-e, but the smaller number of placebo-controlled trials did not show a consistent benefit. A 2009 Cochrane review of four placebo-controlled trials in 656 people with knee or hip osteoarthritis judged their quality poor, found only a small, non-significant difference in pain, and said routine use should not be advised until larger trials are done. Joint pain belongs with your doctor; our glucosamine guide reviews another popular joint supplement with similar evidence gaps.
Liver research
Low SAM-e levels have been linked to liver disease, and animal studies looked encouraging. In people, NCCIH says studies on cholestasis of pregnancy conflict and research on alcohol-related cirrhosis, hepatitis C and fatty liver disease is inconclusive. A Cochrane review on alcoholic liver disease was withdrawn in 2015 because it was out of date. Liver disease needs medical care, not self-directed supplements.
SAM-e side effects and drug interactions
NCCIH describes SAM-e side effects as uncommon and usually minor, mainly nausea and digestive upset. Long-term safety data are limited because most studies were short, although one two-year study in alcohol-related liver disease reported no serious side effects. The bigger concerns are who takes it and what else they take:
- Bipolar disorder: SAM-e may worsen mania, so people with bipolar disorder should use it only under a health care provider’s supervision. The Cochrane review recorded two cases of mania or hypomania among 441 people taking SAM-e.
- Serotonin-raising products: NCCIH says SAM-e might interact with antidepressants, L-tryptophan and St. John’s wort, all of which raise serotonin.
- Levodopa: SAM-e may reduce the effect of this Parkinson’s disease medicine.
- Weakened immune system: there is a theoretical concern for people who are immunocompromised, such as people living with HIV, because SAM-e helps the Pneumocystis organism grow.
- Pregnancy and children: safety during pregnancy has not been established; ask a pediatrician before giving SAM-e to a child.
Choosing and reading a SAM-e label
Dietary supplements do not need FDA approval before they are sold, so the label and the brand’s testing are what you have to go on. Look for a Supplement Facts panel that names S-adenosylmethionine, a clear list of other ingredients and an independent quality seal; our guide to third-party tested supplements explains what those seals check. Bring the bottle to your pharmacist so they can screen it against your medicines. For another example of a supplement whose lab promise outran human results, see our resveratrol guide.
Frequently Asked Questions
What is a SAM-e supplement?
It provides S-adenosylmethionine, a compound the body makes from methionine and uses as its main methyl donor. In the US it is sold as a dietary supplement.
Does SAM-e work for depression?
The evidence is not conclusive. Many trials were small and short, and a 2016 Cochrane review could not draw firm conclusions. Talk to a clinician about depression.
What are SAM-e side effects?
NCCIH says side effects are uncommon and usually minor, such as nausea or digestive upset. It may worsen mania in people with bipolar disorder.
Can I take SAM-e with an antidepressant?
Only with your prescriber’s approval. SAM-e might interact with antidepressants and other products that raise serotonin.
Is SAM-e good for joints?
Research is mixed. It matched NSAIDs in some comparison trials, but placebo-controlled trials were small, of poor quality and inconsistent.
What are the claimed SAM-e benefits for the liver?
Animal studies were promising, but human studies conflict or are inconclusive, so no liver benefit has been established.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines or are pregnant. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: St John’s Wort: Drug Interactions, Side Effects and What Research Shows, 5-HTP: Benefits, Side Effects, Weight Loss Evidence and Drug Interactions, Methylfolate vs Folic Acid: Folate Forms, MTHFR and Safety.