St. John's Wort
Hypericum perforatum
A well-researched herbal remedy for mild-to-moderate depression, comparable to prescription antidepressants.
St. John's Wort is a flowering plant that has been used for centuries to treat mood disorders. Modern research confirms its effectiveness for mild-to-moderate depression, with some studies showing comparable efficacy to SSRIs. It works through multiple mechanisms including serotonin, dopamine, and norepinephrine modulation. However, it has significant drug interactions that require careful consideration.
Mechanisms of Action
Serotonin Modulation
Inhibits serotonin reuptake, increasing availability
Dopamine & Norepinephrine
Also affects dopamine and norepinephrine systems
Neuroplasticity Support
May support brain-derived neurotrophic factor (BDNF)
Recommended Dose
300mg 3x daily (900mg total)
Loading: Not applicable; effects build gradually over weeks
Optimal Timing
- With meals
- Divided into 2-3 doses
Take with food
Best Form
Standardized extract (0.3% hypericin)
Alternatives: Capsules, Tablets, Tincture
Use standardized extracts for consistent potency. Look for products standardized to 0.3% hypericin or 3-5% hyperforin.
Duration
Minimum: 6 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Take consistently at the same times each day. Full effects may take 4-6 weeks to manifest.
Personalized Dosage Calculator
Get a dosage recommendation tailored to your body weight, age, goals, and health profile.
Set up your health profile for personalized recommendations
Improved Mood
Reduction in depressive symptoms
Better Sleep
Improved sleep quality as mood improves
Sun Sensitivity
Increased sensitivity to sunlight
GI Upset
Mild stomach discomfort or nausea
Avoid — Uterotonic effects, CYP450 enzyme induction affecting prenatal vitamins and medications
Not recommended without medical supervision
Who Should NOT Take This
- Currently taking prescription antidepressants
- Bipolar disorder (may trigger mania)
- Before surgery (2 weeks prior)
- Taking immunosuppressants or organ transplant medications
Drug Interactions
Risk of serotonin syndrome - never combine with prescription antidepressants
Significantly reduces effectiveness of hormonal contraceptives
Reduces anticoagulant effect, increasing clot risk
Dramatically reduces effectiveness of antiretrovirals
Reduces drug levels, risking organ rejection
Serotonin syndrome risk; reduced drug effectiveness
Serotonin syndrome risk; reduced drug effectiveness
Serotonin syndrome risk; reduced drug effectiveness
Serotonin syndrome risk
Serotonin syndrome risk
Serotonin syndrome risk
Serotonin syndrome risk
Severe serotonin syndrome, hypertensive crisis
Breakthrough bleeding, reduced contraceptive effectiveness
Loss of heart failure/arrhythmia control, clinical deterioration
Treatment failure, viral resistance, disease progression
Treatment failure, viral resistance
Treatment failure, viral resistance
Treatment failure, persistent infection
Treatment failure, breakthrough infections
Contraceptive failure, breakthrough bleeding, pregnancy risk
Variable drug levels, possible serotonin syndrome
Treatment failure, viral resistance, disease progression
Reduced anticoagulant effectiveness, clot risk
Possible Side Effects
Tip: Use sunscreen and limit sun exposure
Tip: Take with food
Tip: Usually resolves with continued use
Warnings
- DO NOT combine with prescription antidepressants - serotonin syndrome risk
- Has MANY drug interactions - consult pharmacist before use
- Stop 2 weeks before any surgery
- For mild-to-moderate depression only; not for severe depression
Top studies from 40+ peer-reviewed papers
Howes S et al. • The Cochrane database of systematic reviews (2020)
“There is high-certainty evidence that bupropion can aid long-term smoking cessation.”
Key Findings:
- There was high-certainty evidence that bupropion increased long-term smoking cessation rates (RR 1.64, 95% CI 1.52 to 1.77; I2 = 15%; 45 studies, 17,866 participants).
- Results were imprecise and CIs encompassed no difference (RR 1.16, 95% CI 0.90 to 1.48; I2 = 0%; 21 studies, 10,625 participants; moderate-certainty evidence, downgraded one level due to imprecision).
- We found high-certainty evidence that use of bupropion resulted in more trial dropouts due to adverse events of the drug than placebo (RR 1.37, 95% CI 1.21 to 1.56; I2 = 19%; 25 studies, 12,340 participants).
- Participants randomized to bupropion were also more likely to report psychiatric AEs compared with those randomized to placebo (RR 1.25, 95% CI 1.15 to 1.37; I2 = 15%; 6 studies, 4439 participants).
Linde K et al. • Cochrane Database of Systematic Reviews (2008)
“The available evidence suggests that the hypericum extracts tested in the included trials are superior to placebo and similarly effective as standard antidepressants.”
Key Findings:
- As effective as standard antidepressants for mild-moderate depression
- Fewer side effects than prescription medications
- Not effective for severe depression
Urata M et al. • Neuropsychopharmacology reports (2025)
“This review demonstrates that certain supplements, such as eicosapentaenoic acids and Rhodiola rosea, are therapeutic options for mild depression.”
Key Findings:
- A meta-analysis found no significant difference in response rates between the two treatments (risk ratio [RR] = 0.96, 95% CI: 0.78-1.18) or dropout rates (RR = 1.08, 95% CI: 0.62-1.88).
- Eicosapentaenoic acid and Rhodiola rosea demonstrated significant improvements in depressive symptoms compared to placebo.
- Conversely, S-adenosylmethionine did not produce significant improvements relative to placebo.
Li J et al. • Phytotherapy research : PTR (2025)
“Future longer follow-up, larger samples, and more methodologically rigorous randomized controlled trials are recommended to clearly establish the effects of different dosages on cognitive function and quality of life in stroke patients.© 2025 John Wiley & Sons Ltd.”
Key Findings:
- John's Wort extract (SUCRA 71.2%) was the most effective in reducing NIHSS scores, Berberine (SUCRA 84.1%) was most effective in reducing mRS scores, and St.
- John's Wort extract (SUCRA 99.1%) showed the highest efficacy in enhancing ADL scores.
- Ginsenosides were the most effective in improving Barthel Index (SUCRA 74.7%), MMSE (SUCRA 93%), and MOCA (SUCRA 79.7%) scores.
Zhao X et al. • Advances in clinical and experimental medicine : official organ Wroclaw Medical University (2023)
“Our research supports the use of SJW as it reduced the number of depressive patients and their HAMD scores while having fewer risks and side effects than conventional medications.”
Key Findings:
- For patients treated with either SSRIs or SJW, a pooled OR of 2.44 with a 95% confidence interval (95% CI) of 1.33-4.45 was obtained.
- The data were heterogeneous, with a tau2 value of 0.54, χ2 value of 31.05, degrees of freedom (df) value of 7, I2 value of 77%, and an overall Z-value of 2.90 with p = 0.004.
- Our research supports the use of SJW as it reduced the number of depressive patients and their HAMD scores while having fewer risks and side effects than conventional medications.
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.