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SAM-e (S-adenosylmethionine)

A methyl donor with osteoarthritis evidence rivalling NSAIDs — and a second life in mood.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

SupplementsJoint healthMood

SAM-e (S-adenosylmethionine) is a compound the body makes itself, central to methylation reactions. As a supplement it has two evidence stories: osteoarthritis and depression.

Key takeaways

  • A natural methyl donor involved in cartilage and neurotransmitter synthesis.
  • For osteoarthritis, trials suggest pain/function relief comparable to NSAIDs but with slower onset and fewer stomach side effects — though overall evidence quality is modest.1
  • Also has antidepressant evidence, including as an add-on.2
  • Effective doses are high (600–1200 mg/day) and it is expensive; caution with bipolar disorder and antidepressants.

What it is

SAM-e is made from the amino acid methionine and ATP, and is the body’s main methyl donor. Those methylation reactions matter for building cartilage proteoglycans and for making neurotransmitters — which is why the same molecule turns up in both joint and mood research.

The evidence

Osteoarthritis

Reviews of randomised trials suggest SAM-e can reduce OA pain and improve function about as well as NSAIDs, with a better stomach-tolerance profile but a slower onset (a few weeks). A Cochrane review judged the evidence inconclusive and of low quality, so the effect is plausible but not firmly proven.1

Mood

SAM-e also has antidepressant evidence, both alone and as an add-on to standard antidepressants in partial responders.2 That is a genuine second use — but it is where the drug-interaction cautions below become important.

Dose & how to use

Typical OA doses are 600–1200 mg/day (often split), as enteric-coated tablets taken between meals. Allow 2–4 weeks for a joint effect. It is one of the pricier supplements, which is a practical downside.

Safety & who benefits

Common effects are mild nausea, digestive upset or insomnia (take earlier in the day). Two important cautions: it can trigger mania in people with bipolar disorder, and combined with antidepressants/SSRIs it raises a theoretical serotonin-syndrome risk — use only with medical guidance if you take those. Avoid in pregnancy without advice. Of interest to people with osteoarthritis (especially if NSAIDs upset the stomach) or as a physician-guided mood adjunct.

Bottom line: plausibly as effective as NSAIDs for OA with a gentler stomach profile, plus real mood evidence — but the data are modest, it is expensive, and the drug interactions mean it is not a casual pick.

References

Adult research summary for education, not a prescription. These are food supplements, not treatments for disease.

  1. Rutjes AWS, et al. S-adenosylmethionine for osteoarthritis of the knee or hip. Cochrane Database Syst Rev 2009;(4):CD007321. pubmed.ncbi.nlm.nih.gov
  2. Sharma A, et al. S-Adenosylmethionine (SAMe) for neuropsychiatric disorders: a clinician-oriented review. J Clin Psychiatry 2017;78:e656–e667. pmc.ncbi.nlm.nih.gov

This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.