Supplement analysis backed by scientific evidence · PT

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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.

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.

Scientific references

Where to buy

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

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