Effective for mild to moderate depression in trials — and the longest drug-interaction list in the herbal pharmacopoeia. — Hypericum perforatum
remedySt John's wort Hypericum perforatum — hand-drawn plate, stylised. Not for identification — use a field guide and verify with a second source before eating any wild plant.
St John's wort (Hypericum perforatum) is one of the very few herbal medicines with systematic-review evidence of effectiveness for a serious condition: mild to moderate depression.
What the evidence supports. Meta-analyses show effectiveness superior to placebo and comparable to standard antidepressants for mild to moderate depression, with fewer side effects. The evidence in severe depression is not sufficient, and severe depression needs clinical care.
Why it is nonetheless one of the more dangerous herbs in the cabinet. St John's wort is a potent inducer of CYP3A4 and P-glycoprotein. That means it reduces blood levels of a very long list of drugs — hormonal contraceptives (with documented contraceptive failure), ciclosporin and other immunosuppressants, some HIV medicines, anticoagulants, some cancer treatments and many others. A herb that quietly makes someone's medication stop working is more dangerous than one that causes obvious side effects.
It is also photosensitising. A photosensitising herb is an obvious mismatch for conditions treated with bright-light therapy, and it increases sunburn risk.
Do not combine it with an SSRI or other serotonergic drug — serotonin syndrome risk.
And it must be tapered, not stopped abruptly, after long use, like any antidepressant.
What the studies found
Meta-Analysis2023Advances in clinical and experimental medicine : official organ Wroclaw Medical University
The efficacy and safety of St. John's wort extract in depression therapy compared to SSRIs in adults: A meta-analysis of randomized clinical trials.
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.
Meta-Analysis2022The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry
Clinician guidelines for the treatment of psychiatric disorders with nutraceuticals and phytoceuticals: The World Federation of Societies of Biological Psychiatry (WFSBP) and Canadian Network for Mood and Anxiety Treatments (CANMAT) Taskforce.
Based on the current data and clinician input, a range of nutraceuticals and phytoceuticals were given either a supportive recommendation or a provisional recommendation across a range of various psychiatric disorders.
The Efficacy of Saffron in the Treatment of Mild to Moderate Depression: A Meta-analysis.
Available data from randomized, controlled clinical trials support that saffron is significantly more effective than placebo (g = 0.891; 95% CI: 0.369 - 1.412, p = 0.001), and non-inferior to tested antidepressant drugs (g = - 0.246; 95% CI: - 0.495 - 0.004, p = 0.053).
Interaction of herbal products with prescribed medications: A systematic review and meta-analysis.
Our studies show that meta-analyses are important in the area of natural products to provide necessary information on their use in overall medication plans in order to avoid unintended interactions.
| | |
|---|---|
| Life | Perennial; spreads by runners |
| Propagation | Seed, surface-sown, or division |
| Light | Full sun |
| Soil | Any; drought tolerant once established |
| Spacing | 30-45 cm; it will spread aggressively |
| Harvest | Flowering tops at full flower, midsummer |
| Dry | Shade, ambient |
| Note | The fresh flowering tops infused in oil make the traditional red oil |
Cut at full flower in dry conditions. The oil made from fresh flowering tops turns a deep red as the hypericin extracts — the traditional St John's wort oil, used topically for nerve pain and wounds.
Preparation
Tea — 2 teaspoons dried flowering tops per cup, 10 minutes, up to three times daily. The trials mostly used standardised extracts rather than tea.
Tincture — the conventional form; fresh or dried flowering tops in alcohol.
Standardised extract — what most of the clinical trials used; 300 mg three times daily is the common trial dose.
Red oil — fresh flowering tops macerated in oil in sunlight for several weeks until deep red; for topical use on nerve pain, bruises and wounds.
Tapering — do not stop abruptly after long use.
Cautions and interactions
St John's wort interacts with a very long list of drugs and can make them stop working — including hormonal contraceptives, immunosuppressants, anticoagulants, some HIV medicines and some cancer treatments.
Do not combine it with an SSRI or other serotonergic drug — serotonin syndrome risk.
Photosensitising — avoid high sun exposure and bright-light therapy.
Not for severe depression — that needs clinical care.
Do not stop abruptly after long use — taper.
Avoid in pregnancy and breastfeeding without advice.
When this is not a self-care problem — get help
Any suicidal thought or plan — get help now. In the US, call or text 988.
Severe agitation, confusion, tremor or fever while on St John's wort with another serotonergic drug — emergency care; possible serotonin syndrome.
Unplanned pregnancy while relying on a hormonal contraceptive — speak to a clinician.
Known interactions
CYP3A4 and P-glycoprotein induction reduces levels of: combined oral contraceptives, ciclosporin and tacrolimus, warfarin, some HIV antiretrovirals, some chemotherapeutics, and many others. Additive serotonergic effect with SSRIs, tramadol, triptans.
The efficacy and safety of St. John's wort extract in depression therapy compared to SSRIs in adults: A meta-analysis of randomized clinical trials. Advances in clinical and experimental medicine : official organ Wroclaw Medical University 2023; doi:10.17219/acem/152942 PubMed 36226689
Medicine for chronic atrophic gastritis: a systematic review, meta- and network pharmacology analysis. Annals of medicine 2023; doi:10.1016/j.lfs.2022.120752 PubMed 38170849
Clinician guidelines for the treatment of psychiatric disorders with nutraceuticals and phytoceuticals: The World Federation of Societies of Biological Psychiatry (WFSBP) and Canadian Network for Mood and Anxiety Treatments (CANMAT) Taskforce. The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry 2022; doi:10.1080/15622975.2021.2013041 PubMed 35311615
The Efficacy of Saffron in the Treatment of Mild to Moderate Depression: A Meta-analysis. Planta medica 2019; doi:10.1055/a-0660-9565 PubMed 30036891
Interaction of herbal products with prescribed medications: A systematic review and meta-analysis. Pharmacological research 2019; doi:10.1016/j.phrs.2019.01.028 PubMed 30660822
Clinical use of Hypericum perforatum (St John's wort) in depression: A meta-analysis. Journal of affective disorders 2017; doi:10.1016/j.jad.2016.12.048 PubMed 28064110