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S-Adenosyl-L-Methionine
Drives 100+ methylation reactions including neurotransmitter synthesis — studied for mood, joint comfort, and liver health.
What the evidence says
SAMe doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 1984–2026 with a typical study size of 1,049 participants.
Based on 84 studies · 13 meta-analyses · 60 RCTs · 1,129 total participants
Confidence
High confidenceBy outcome
A moderate-certainty meta-analysis supports SAMe as monotherapy for depression, but as an add-on to antidepressants it did no better than placebo. For knee osteoarthritis, one 61-person crossover trial found celecoxib reduced pain more in the first month and no significant difference after that, while the Cochrane osteoarthritis review was inconclusive and advises against routine use. Null cognition findings add to the limits. That is Moderate, resting mainly on monotherapy for depression.
60 randomised trials
84% were about SAMe in an audit of 50 of them
Every randomised or controlled trial of SAMe indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Sep 2026
13 trials ongoing or recruiting · 44 completed on ClinicalTrials.gov
15 of the completed trials have posted results
Registered trials show research momentum for SAMe, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for SAMe meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
SAMe is a molecule naturally produced in the body that's involved in over 100 biochemical reactions including neurotransmitter synthesis, joint cartilage maintenance, and liver detoxification.
For depression, a 2024 meta-analysis found moderate-certainty benefit for SAMe alone against placebo, and no significant difference from antidepressants in seven head-to-head trials, while its authors say its efficacy compared with antidepressants remains unresolved.
For osteoarthritis, a Cochrane review of placebo-controlled trials was inconclusive and advises against routine use. It is also studied in liver disease.
Provides methyl groups for critical reactions
Supports synthesis of mood-regulating neurotransmitters
Supports joint cartilage maintenance
How SAMe works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Insufficient data; avoid
Avoid — may trigger manic episodes
Risk of serotonin syndrome — use only under medical supervision
May reduce effectiveness
Increased serotonin syndrome risk
Tip: Start low, use enteric-coated, take with small snack if needed
Tip: Reduce dose
Tip: Take earlier in day
Tip: Contraindicated in bipolar disorder
SAMe has an evidence score of 6.5/10 — moderate evidence based on 84 indexed studies, including 4 meta-analyses. Drives 100+ methylation reactions including neurotransmitter synthesis — studied for mood, joint comfort, and liver health. Representative study: PMID 40014460.
The commonly studied dose of SAMe is 400-1,200 mg for mood, 600-1,200 mg for joints. The cited trials used 1,200 mg for knee osteoarthritis and 200 mg a day with probiotics. Label products for mood go up to 1,600 mg, above the highest dose in the cited trials. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take SAMe is in the morning. It can be taken on an empty stomach. S-adenosylmethionine (SAMe) is the body's primary methyl donor, involved in >100 methylation reactions including neurotransmitter synthesis, DNA methylation, and phospholipid metabolism.
SAMe has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. The most commonly reported side effects are GI upset/nausea, anxiety/restlessness, insomnia. Use caution if any of these apply to you: Bipolar disorder (may trigger mania); Parkinson's disease on levodopa.
L-Theanine
Too few graded studiesTea-derived amino acid that boosts alpha brain waves for calm, focused alertness — synergizes with caffeine to reduce jitteriness.
Omega-3
Probably helpsEssential fatty acids critical for brain health, mood regulation, and reducing inflammation throughout the body.
Curcumin
Probably helpsTurmeric's active compound that modulates NF-kB inflammatory pathways — supports mood, joint health, and post-exercise recovery.
NAC
Likely helpsRate-limiting precursor to glutathione, the body's master antioxidant — supports mood, respiratory health, and liver protection.
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Reviewed by Dr. Baher Al Hakim · Last reviewed September 2026 · evidence from 84 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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