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Supplements and Antidepressants: What's Safe, What Interacts and What Helps Depression

Don't stop or swap your antidepressant on your own; St John's wort interacts with many medicines. Check any supplement with your prescriber or pharmacist first, because St John's wort, 5-HTP and tryptophan add to serotonin, raising the risk of serotonin syndrome, especially with SSRIs or MAOIs. On its own, St John's wort helped adults with mild to moderate depression in short trials (grade A), but whether it helps severe depression or people at risk of suicide is unclear.

Published How we grade evidenceEditorial policy

The short version

  • If you are thinking about suicide or harming yourself, call or text 988 in the US (the 988 Suicide & Crisis Lifeline) or your local emergency number now. A supplement is not the right tool for a crisis.
  • Don't stop or swap your antidepressant on your own, and don't add a supplement without your prescriber or pharmacist. St John's wort interacts with many medicines. St John's wort, 5-HTP and tryptophan add to serotonin, and the sertraline label warns that St John's wort and tryptophan make serotonin syndrome, a serotonin overload that can be life-threatening, more likely (sertraline label; Mikkelsen 2023). On an MAOI antidepressant, serotonin supplements are a particular danger (Sternbach 1991).
  • Grade A, with limits. In trials of 4 to 12 weeks in adults with mild to moderate depression, St John's wort on its own helped more than placebo (Apaydin 2016; Ng 2017). Whether it helps severe depression or people at high risk of suicide is unclear (Ng 2017), and it weakens many medicines, including some antidepressants and the pill (NCCIH).
  • Grade C. In adults with depression, omega-3 fish oil eased symptoms only slightly, probably too little to notice, with very low certainty (Appleton 2021).
  • Grade B. Compared with placebo, saffron lowered self-rated depression scores in adults with or without diagnosed depression, but not scores rated by clinicians (Mahmoudi 2026).
  • Talking therapy and antidepressant medicines have the strongest evidence; exercise also helps, though its trials are less certain (Cuijpers 2020; Noetel 2024).
SupplementWith an antidepressantFor depression on its ownGrade (depression)
St John's wortSerotonin syndrome risk; lowers levels of some antidepressantsHelped mild to moderate depression in short trials; unclear in severe depressionA
5-HTP, tryptophanAdds to serotonin; labels warn about tryptophanWeak trials, few with placeboC
SAMeMania in a case report with an SSRIReviews disagreeC
Omega-3 (mostly EPA)Tested alongside antidepressants in trialsSmall effect, very low certaintyC
SaffronNot studied for interactionsSelf-rated scores fellB
Vitamin DTested alongside antidepressants in trialsSmall effect, mainly with symptomsB

Which supplements interact with antidepressants?

SSRIs (selective serotonin reuptake inhibitors) such as sertraline (Zoloft) and escitalopram (Lexapro) are widely used antidepressants (Mikkelsen 2023). Serotonin syndrome can follow normal use of one serotonin drug or a mix of two or more, and it affects the muscles, heart rate, temperature and thinking (Mikkelsen 2023). The sertraline label lists agitation, confusion, a fast heartbeat, sweating, a high temperature, shaking and twitching or stiff muscles among its signs. Its list of other serotonin drugs includes other SSRIs, SNRIs (such as venlafaxine), tricyclic antidepressants, triptans, tramadol, lithium, tryptophan and St John's wort (sertraline label).

  • St John's wort. Doctors described five older patients who developed serotonin syndrome after combining a prescription antidepressant with it (Lantz 1999). It also switches on the liver enzyme CYP3A4 and the drug pump P-glycoprotein, which changed how the body handled drugs such as warfarin, simvastatin and birth control pills (Nicolussi 2020). NIH's National Center for Complementary and Integrative Health (NCCIH) lists amitriptyline and bupropion among the antidepressants it weakens (NCCIH). See can I take St John's wort with SSRIs? and St John's wort with birth control.
  • 5-HTP and tryptophan. Both are building blocks of serotonin. The SSRI labels name tryptophan in their serotonin syndrome warning (escitalopram label); see can I take 5-HTP with SSRIs?.
  • MAOI antidepressants. MAOIs (monoamine oxidase inhibitors, such as phenelzine) stop the body breaking down serotonin. A 1991 review found serotonin syndrome most often came from a serotonin drug combined with an MAOI (Sternbach 1991), and a patient on an MAOI developed mania after adding a 5-HTP supplement (Pardo 2012). The sertraline label requires at least 14 days between stopping an MAOI and starting sertraline, and the other way round (sertraline label). MAOIs also carry a food risk: tyramine-rich foods can set off a dangerous rise in blood pressure, a hypertensive crisis (Brown 1988). On an MAOI, take no St John's wort, 5-HTP, tryptophan or SAMe unless your psychiatrist agrees.
  • SAMe. A patient taking SAMe with an SSRI developed mania with psychotic features in a case report (Abeysundera 2018).
  • Melatonin with fluvoxamine. In 5 healthy men, the SSRI fluvoxamine raised blood levels of a melatonin dose about 17-fold (Härtter 2000). Ask your pharmacist before combining the two.
  • Bleeding. SSRIs were linked to 41% higher odds of serious bleeding in 42 observational studies (Laporte 2017), and to more major bleeding when taken with a blood thinner (Rahman 2023). The sertraline label says aspirin, NSAID painkillers such as ibuprofen and naproxen, other antiplatelet drugs, warfarin and other anticoagulants may add to this risk (sertraline label). If you also take a supplement linked to bleeding, such as ginkgo or vitamin E, ask your pharmacist; our supplements and blood thinners guide covers which ones.
  • Lithium. The sertraline label counts lithium as a serotonin drug (sertraline label). Lithium levels can also climb to harmful levels: they shift with salt intake (George 2023), change with blood pressure medicines, diuretics and NSAID painkillers (Malhi 2020), and rose above the safe range in a case report after a sudden cut in caffeine (Song 2024). On lithium, ask your psychiatrist before changing salt, caffeine, painkillers or supplements; see our electrolyte supplements guide.
  • Ashwagandha. A review of adverse-event reports found side effects such as severe diarrhoea and muscle pain in people taking ashwagandha with an SSRI (Siwek 2023); see can I take ashwagandha with SSRIs?.

Which supplements are safe with antidepressants?

No supplement has been shown to be safe with every antidepressant, but some have been given alongside them in trials. A review of add-on trials found no major side effects from omega-3, vitamin D, SAMe or methylfolate taken with antidepressants, beyond minor stomach upset (Sarris 2016). Magnesium was added to SSRIs in two small trials of 60 and 40 people, and depression scores fell more than with placebo or the SSRI alone (Nazarinasab 2022; Walyddaini 2026). L-theanine added to sertraline in 60 people for 6 weeks caused side effects about as often as placebo (Shamabadi 2023). These trials were small and short, too small to catch rare problems such as mania or serotonin syndrome. Most other supplements have had little or no testing with antidepressants, and not studied is not the same as safe. Show your pharmacist every label, including blends, and check your stack against the upper limits.

What helps depression the most?

Talking therapy and antidepressants both work, and together they work best. In 101 trials (11,910 people), combining them led to more responses than either alone, and therapy alone and medicine alone showed no clear difference (Cuijpers 2020). In 522 trials (116,477 adults with major depression), all 21 antidepressants studied beat placebo (Cipriani 2018). Exercise helps too: walking or jogging, yoga and strength training gave moderate drops in depression in 218 trials, though the certainty was low to very low (Noetel 2024). A 2022 international guideline says supplements belong mainly as add-ons within normal medical care, especially in more severe illness (Sarris 2022).

Does St John's wort work for depression?

Grade A for short-term help in adults with mild to moderate major depression. A Cochrane review of 29 double-blind trials (5,489 patients) found more responders than on placebo in its 18 placebo comparisons, with a smaller effect in the 9 larger trials than the 9 smaller ones and more favourable results from German-speaking countries (Linde 2008). A 2016 review rated the evidence moderate: more responders than placebo in 18 trials (2,922 patients), with little research in severe depression (Apaydin 2016). Against SSRIs, 27 trials (3,808 patients) showed no clear difference in response and fewer dropouts, but none lasted beyond 12 weeks, and whether it helps severe depression or people at high risk of suicide is unclear (Ng 2017). No clear difference is not proof that the two work equally well. The catch is safety: it weakens many medicines, can trigger mania (below), and NCCIH says large doses can cause severe skin reactions in sunlight (NCCIH).

Does fish oil help depression?

Grade C in adults with depression, mostly compared with placebo. A Cochrane review of 33 placebo-controlled trials (1,848 adults) found a small benefit, about 2.5 points on a depression scale where 3 points is the smallest change judged clinically important. It rated the certainty very low and warned that the effect may be overestimated (Appleton 2021). In a meta-analysis of 26 trials (2,160 people), products that were all or mostly EPA (60% or more), at up to 1 g of EPA a day, helped, while mostly-DHA products did not (Liao 2019). That is the amount studied, not a recommendation; agree any amount with your prescriber. For prevention, the VITAL trial gave 18,353 adults aged 50 or over without depression omega-3 or placebo for about 5 years: depression was slightly more common with omega-3, and mood scores did not differ (Okereke 2021).

Does saffron help depression?

Grade B for self-rated symptoms only, compared with placebo, in adults with or without diagnosed depression. In 34 trials (1,769 adults), saffron lowered scores on a self-rated depression questionnaire (14 trials, 817 people) with moderate certainty, but made no clear difference on the scale clinicians rate (Mahmoudi 2026). In 8 trials that compared it with SSRIs, depression scores showed no clear difference either way, and saffron caused fewer side effects (Shafiee 2025). No clear difference is not proof that the two work equally well.

Does vitamin D help depression?

Grade B for a small effect, mainly in people who already have symptoms. Pooling 31 trials (24,189 adults), vitamin D3 slightly lowered depression scores with moderate certainty, more in people with depressive symptoms, and trials longer than 6 months showed no clear effect (Ghaemi 2024). In VITAL, 5 years of vitamin D3 did not lower the risk of depression in 18,353 adults aged 50 or over (Okereke 2020). Our vitamin D and seasonal depression guide covers amounts, testing and winter low mood.

Do SAMe, 5-HTP or tryptophan help depression?

  • SAMe, grade C, because reviews disagree. A 2024 meta-analysis of 23 trials (2,183 people) found that SAMe taken alone did better than placebo (moderate certainty), while SAMe taken on top of an antidepressant made no clear difference (Limveeraprajak 2024). Another 2024 meta-analysis of 14 trials found no clear benefit over placebo in either use (Peng 2024), and a Cochrane review rated the evidence low to very low quality and included trials that gave SAMe by injection rather than by mouth (Galizia 2016). In one supervised trial, 73 people still depressed on a serotonin reuptake inhibitor added oral SAMe (aiming for 800 mg twice a day) or placebo for 6 weeks: 36% responded on SAMe and 18% on placebo (Papakostas 2010); that dose was studied under supervision and is not a recommendation. Our SAMe page shows grade B for depression; this guide gives C because the 2024 reviews disagree and the pooled add-on trials showed no clear difference.
  • 5-HTP and tryptophan, grade C. A 2020 review of 13 studies of 5-HTP judged them weak, with few placebo groups (Javelle 2020), and a 2022 guideline did not support tryptophan for depression (Sarris 2022). Our 5-HTP page shows grade B for depression; this guide gives C because the trials are weak and few compared 5-HTP with placebo.

What else has been tested for depression?

SupplementWhat trials foundGrade
Methylfolate, added to antidepressantsMore responders in 3 trials (483 people); modest effect (Maruf 2022)B
Zinc, added to antidepressantsLower scores in 5 trials, but not when the trials were split by size (da Silva 2021)C
CurcuminLower scores in 8 trials of adults with depression or depressive symptoms; the result was fragile and varied widely (Musazadeh 2026)C
ProbioticsLower scores in 18 trials of people with diagnosed depression, but products differed widely (Asad 2025)C
Creatine, added to escitalopramGreater and earlier improvement in one trial of 52 women, 5 g a day for 8 weeks (the amount studied, not a recommendation) (Lyoo 2012)C
RhodiolaNo clear difference between rhodiola, sertraline and placebo in 57 adults over 12 weeks (Mao 2015)C

Probiotic products differed from trial to trial, so one trial's result says little about another product (Asad 2025). Our curcumin page shows grade B for depression; this guide gives C because the pooled result was fragile. NCCIH warns that highly absorbable curcumin products may harm the liver (NCCIH); see our supplements and your liver guide.

What we'd skip

  • St John's wort, 5-HTP or tryptophan on top of an antidepressant, and St John's wort with any medicine your pharmacist hasn't cleared: serotonin syndrome is on the drug labels and in case reports (Lantz 1999; Mikkelsen 2023), and the herb lowers levels of many drugs (Nicolussi 2020).
  • Tryptophan supplements: they were tied to eosinophilia-myalgia syndrome, a rare inflammatory illness of the muscles, skin and lungs; whether impurities were the cause is still unproven (Ko 2023).
  • Rhodiola for depression: no clear benefit over placebo in a small randomized trial (Mao 2015), and a 2022 guideline did not support it for mood disorders (Sarris 2022).

Safety and interactions

  • Serotonin syndrome: the SSRI labels also warn about triptan migraine drugs and tramadol, so tell your prescriber about every serotonin drug and supplement you use (sertraline label).
  • Mania: in a review of 35 case reports of mania linked to herbal medicines, St John's wort was named in 14, though cause is hard to prove from case reports (Bostock 2018); doctors advise screening for past mania before using it (Nierenberg 1999). The Cochrane SAMe review counted 2 cases of mania or hypomania among 441 people taking SAMe (Galizia 2016). If you have bipolar disorder, ask your psychiatrist before any mood supplement; see our bipolar disorder protocol.
  • Stopping an antidepressant: about 1 in 3 people who stop one get at least one discontinuation symptom (about 1 in 6 or 7 beyond what placebo causes), and about 3 in 100 have severe ones (Henssler 2024). Depression can also come back: in trials of people who were well on an antidepressant, staying on 14 of the 20 drugs tested meant fewer relapses over 6 months than switching to placebo (Kishi 2023). Don't stop or swap a prescribed medicine for a supplement on your own; ask the prescriber or pharmacist.
  • Pregnancy and breastfeeding: NCCIH warns that St John's wort in pregnancy may raise the risk of birth defects, and that breastfed babies of mothers taking it can have colic and drowsiness (NCCIH). Ask your doctor or midwife before any supplement; see our perinatal depression protocol.
  • Under 18: ask a clinician.

When to see a doctor

  • Right now: if you are thinking about suicide or self-harm, call or text 988 (US) to reach the 988 Suicide & Crisis Lifeline, or call your local emergency number.
  • Emergency care: agitation or confusion, a racing heart, sweating, a high temperature, shaking, or twitching or stiff muscles after adding a supplement to an antidepressant. These can be serotonin syndrome.
  • Urgently: little need for sleep, racing thoughts or reckless behaviour after starting St John's wort or SAMe, which can be mania.
  • Soon: low mood or loss of interest lasting more than two weeks, low mood in pregnancy or after birth, or side effects from your antidepressant.

Don't stop a prescribed medicine on your own; ask the prescriber or pharmacist.

FAQ

Can I take St John's wort with sertraline? No, unless your prescriber agrees. The sertraline label warns that St John's wort makes serotonin syndrome more likely, and five older patients developed it after combining the herb with an antidepressant.

Can I take 5-HTP with an SSRI? Only if your prescriber agrees. The body makes serotonin from 5-HTP, and SSRI labels warn about tryptophan, the step before it.

What supplements are safe to take with antidepressants? None has been shown to be safe with every antidepressant. Omega-3 and vitamin D have been added to antidepressants in trials without major side effects, and L-theanine in one small trial; magnesium has been added to SSRIs in two small trials that did not report side effects. Avoid St John's wort, 5-HTP and tryptophan, and ask your pharmacist about anything else.

Can I take melatonin with an antidepressant? Ask your pharmacist first. Fluvoxamine raised melatonin levels about 17-fold in a small study of 5 healthy men; that study tested only fluvoxamine.

Can I stop my antidepressant and take St John's wort instead? Not on your own. Stopping can cause discontinuation symptoms and depression can come back, and St John's wort can be dangerous to combine with many antidepressants; any change needs your prescriber.

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