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Moderate evidenceStress & mood

SAM-e

SAM-e has more RCT support than most mood supplements, but Cochrane found the evidence low quality and inconclusive; it is expensive, unstable, and carries a genuine risk of triggering mania in people with bipolar disorder.

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What the science says

  • Antidepressant evidence is real but inconclusive Moderate evidence

    A Cochrane review of 8 trials in 934 adults found no clear difference between SAM-e and placebo as monotherapy, and no difference versus imipramine or escitalopram, though one trial of SAM-e added to an SSRI showed benefit. The reviewers rated the evidence low quality and concluded it is insufficient to support routine clinical use.

  • Osteoarthritis benefit is small and probably not clinically meaningful Limited evidence

    A Cochrane review of 4 trials in 656 participants with knee or hip osteoarthritis found effects of SAM-e on pain and function that were small and did not reach clinical relevance, with wide confidence intervals. The often-quoted claim that SAM-e matches NSAIDs comes from underpowered comparisons.

  • Mechanism is methyl donation, which cuts both ways Moderate evidence

    SAM-e is the body's principal methyl donor, supporting monoamine synthesis, phospholipid methylation and glutathione production via transsulfuration. This same activity means adequate B12 and folate status is needed to recycle homocysteine, and deficiency in either can blunt the effect or raise homocysteine.

Dosage & safety

Studied doseDepression trials used 400-1600 mg/day, most commonly 800-1600 mg/day orally for 6-12 weeks, taken on an empty stomach in divided doses. Osteoarthritis trials used 600-1200 mg/day. Enteric-coated, foil-blistered butanedisulfonate or tosylate salts are used because SAM-e degrades rapidly with moisture and heat.
SafetyCommon effects are nausea, insomnia, dry mouth, sweating and anxiety, especially when starting at full dose. The most important risk is precipitating hypomania or mania in people with bipolar disorder, including undiagnosed bipolar presenting as depression. Serotonin syndrome has been reported when combined with SSRIs, SNRIs, MAOIs, tramadol or St John's wort. SAM-e can raise homocysteine if B12, B6 or folate are low. Avoid before surgery due to possible interaction with anaesthesia and antidepressants. SAM-e is a prescription drug in several countries including Italy, Spain, Germany and Russia, and is sold as a supplement only in markets such as the US.

How to take it

TimingMorning and early afternoon in divided doses, since insomnia and anxiety are common with evening dosing.
With food?On an empty stomach, about 30 minutes before eating, which is how the trials dosed it.
Worth knowingBuy enteric-coated tablets in foil blisters and start at 200-400 mg — SAM-e degrades with moisture and heat, and starting at full dose is what causes the nausea and jitteriness.

Interactions

With medications

  • SSRIs, SNRIs, MAOIs, tramadol and other serotonergic drugs

    Serotonin syndrome has been reported with these combinations. do not combine without psychiatric supervision

  • levodopa

    SAM-e is a methyl donor and can increase methylation of levodopa, potentially reducing its effect and worsening Parkinson's symptoms. avoid unless your neurologist agrees

  • anaesthesia and pre-surgical medication

    Interaction with anaesthetic agents and antidepressant drugs around surgery is a recognised concern. stop it and tell your surgical team well before a procedure

With other supplements

  • St John's wort, 5-HTP and L-tryptophan

    Additive serotonergic activity with no added benefit. do not stack them

  • vitamin B12, B6 and folate

    SAM-e raises homocysteine when these are low, because remethylation depends on them. make sure B12, B6 and folate status is adequate before using SAM-e long term

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does SAM-e work for depression?

The evidence is moderate but inconclusive. A Cochrane review of 8 trials found no clear difference between SAM-e and placebo as monotherapy and rated the evidence low quality, though one trial of SAM-e added to an SSRI showed benefit.

Does SAM-e help osteoarthritis?

Not meaningfully — the evidence is limited. A Cochrane review of 4 trials found small effects of SAM-e on pain and function that did not reach clinical relevance.

Is SAM-e safe for people with bipolar disorder?

No. SAM-e can trigger hypomania or mania in bipolar disorder, including undiagnosed bipolar presenting as depression, and it can cause serotonin syndrome with SSRIs, SNRIs, MAOIs or tramadol.

How should I take SAM-e?

Depression trials used 800–1600 mg/day of SAM-e on an empty stomach in divided morning and early-afternoon doses. Start at 200–400 mg, and buy enteric-coated tablets in foil blisters, since SAM-e degrades with moisture and heat.

Scientific references

Where to buy

Vitacost, Synergy®, SAM-e, 400 mg, 30 Enteric Coated Tablets

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