St johns wort has a long history as an herbal remedy, especially for mood-related issues. Many people reach for it as a “natural antidepressant,” hoping to avoid prescription drugs. But “natural” doesn’t always mean “risk-free.” This guide walks through what st johns wort can and can’t do, the science behind it, who should avoid it, and how to use it more safely if you and your healthcare provider decide it’s appropriate.
What Is St Johns Wort?
St johns wort (Hypericum perforatum) is a flowering plant traditionally used in European herbal medicine. The yellow flowers are harvested and processed into:
- Capsules or tablets
- Liquid extracts (tinctures)
- Teas
- Oils or topical preparations
The plant contains several active compounds—especially hypericin and hyperforin—thought to influence neurotransmitters such as serotonin, dopamine, and norepinephrine. That’s one reason it’s often compared to conventional antidepressant medications.
Proven and Possible Benefits of St Johns Wort
Research on st johns wort is extensive compared with many other herbal supplements, especially for mild to moderate depression. Still, results vary, and quality of products and studies differs widely.
1. Mild to Moderate Depression
Many clinical trials have examined st johns wort for depressive symptoms:
- Several studies suggest it can be more effective than placebo.
- Some trials indicate it may be similarly effective to certain prescription antidepressants (like SSRIs) for mild to moderate depression, with fewer reported side effects overall.
A large review of studies published in the Cochrane Database concluded that standardized extracts of st johns wort may be as effective as standard antidepressants for mild to moderate depression, though not necessarily for severe depression (source).
Important caveats:
- Benefits are seen primarily in mild to moderate depression, not severe or psychotic depression.
- It is not appropriate for acute suicidal thoughts or emergencies.
- Study results vary depending on extract quality, dosage, and formulation.
2. Anxiety and Mood Support
Some people use st johns wort for general anxiety or mood swings. Evidence here is weaker:
- A few small studies and user reports suggest possible reduction in anxiety symptoms.
- However, data is far less robust than for depression.
- Effects might be indirect—improving mood can sometimes reduce anxious feelings.
If anxiety is your primary concern, other therapies (CBT, lifestyle changes, or targeted medications) may be better studied and more predictable.
3. PMS and Menopausal Symptoms
Preliminary research has explored st johns wort for:
- Premenstrual syndrome (PMS)
- Premenstrual dysphoric disorder (PMDD)
- Menopausal mood changes
Results are mixed but somewhat promising for mood-related symptoms (irritability, low mood). It is not a standard treatment, and most guidelines still recommend more established therapies first.
4. Topical Uses
Oils and creams made from st johns wort have been used on:
- Minor wounds and burns
- Nerve pain (like mild neuralgia)
- Muscle pain
Evidence here is mostly traditional use and small studies, not robust clinical trials. Topical use has different safety considerations than oral use, but can still create sun sensitivity on the treated area.
Major Risks and Side Effects of St Johns Wort
Despite being sold over the counter, st johns wort can cause significant side effects and serious drug interactions. Understanding these is crucial before you start taking it.
Common Side Effects
Many people tolerate st johns wort reasonably well at standard doses, but you may experience:
- Stomach upset, nausea, or diarrhea
- Dry mouth
- Headache
- Fatigue or restlessness
- Dizziness or lightheadedness
- Increased sensitivity to sunlight (photosensitivity), especially at higher doses
If you notice a persistent rash, visual changes, or severe fatigue, stop use and contact a healthcare professional.
Serious Risks: Serotonin Syndrome
St johns wort affects the serotonin system. Combining it with other medications that also increase serotonin can lead to serotonin syndrome, a potentially life-threatening condition.
Symptoms can include:
- Agitation, confusion
- Rapid heart rate and high blood pressure
- Sweating, shivering, fever
- Muscle twitching, rigidity, or tremors
- Diarrhea
- In severe cases, seizures or loss of consciousness
This risk is particularly high if st johns wort is taken with:
- SSRIs (e.g., sertraline, fluoxetine, citalopram)
- SNRIs (e.g., venlafaxine, duloxetine)
- Tricyclic antidepressants
- MAO inhibitors
- Certain migraine medications (triptans)
- Some pain medications (like tramadol)
- Drugs of abuse that impact serotonin (e.g., MDMA)
Never combine st johns wort with these types of medications without explicit medical supervision.
Photosensitivity and Skin Reactions
St johns wort can make your skin more sensitive to sunlight and UV light:
- You may burn more easily.
- Rashes or redness can appear after sun exposure.
- Those with fair skin or long sun exposure (e.g., outdoor workers) are at higher risk.
If you use it:
- Limit direct sun exposure.
- Use broad-spectrum sunscreen and protective clothing.
- Be cautious with tanning beds (ideally avoid them).
Dangerous Drug Interactions With St Johns Wort
The most serious issue with st johns wort is not usually side effects; it’s the way it speeds up the breakdown of many medications in the liver and intestines. It induces enzymes, particularly CYP3A4, and certain transporters like P-glycoprotein.
This can reduce the effectiveness of many important drugs, sometimes to dangerous levels.
Medications that may be affected include (not a complete list):
- Antidepressants and other psychiatric meds
- SSRIs, SNRIs, tricyclics, atypical antidepressants
- Some antipsychotics
- Birth control pills
- Can lower hormone levels, increasing risk of unintended pregnancy and breakthrough bleeding
- Blood thinners
- Warfarin and some newer anticoagulants may be less effective
- HIV medications
- Some antiretroviral drugs can drop to sub-therapeutic levels
- Transplant medications
- Cyclosporine, tacrolimus and others; reduced levels can trigger organ rejection
- Heart medications
- Some statins, digoxin, and others may be affected
- Chemotherapy and cancer therapies
- Certain cancer drugs may be less effective
- Anti-seizure medications
- Levels may change, altering seizure control
Because of these interactions, st johns wort is absolutely contraindicated with some medications. Always tell your doctor and pharmacist if you are taking or considering it.
Who Should Avoid St Johns Wort?
You should generally avoid st johns wort if:
- You take any prescription antidepressant or mood stabilizer.
- You use hormonal birth control and cannot accept the risk of reduced effectiveness.
- You take medications with a narrow safety window (e.g., warfarin, digoxin, cyclosporine, some HIV meds).
- You are pregnant, trying to conceive, or breastfeeding (safety data are limited).
- You have bipolar disorder or a history of mania (it may trigger manic or hypomanic episodes).
- You have a serious medical condition managed with multiple medications (e.g., post-transplant care, HIV, cancer therapy) unless approved by a specialist.
If any of these apply, consult a qualified healthcare professional before considering st johns wort.
Choosing a St Johns Wort Supplement Wisely
If you and your clinician decide that st johns wort is a reasonable option, quality and dosing matter.
What to Look For
When selecting a supplement:
- Standardized extract: Look for standardized hypericin and/or hyperforin content (commonly 0.3% hypericin). This helps ensure consistent dosing.
- Reputable brand: Choose companies that:
- Use third-party testing (e.g., USP, NSF, ConsumerLab verification where available).
- Provide clear ingredient lists and batch numbers.
- Clear dosage information: Product should state mg per capsule and recommended daily dose.
Typical Dosing in Studies
Clinical studies often use:
- 300 mg standardized extract, taken three times daily (total 900 mg/day), or
- Similar daily totals using different formulations.
Do not exceed recommended doses on the label without medical guidance. Effects on mood can take 2–4 weeks to become noticeable, similar to prescription antidepressants.
Practical Safety Tips for Using St Johns Wort
If you proceed with st johns wort under professional guidance, follow these practical safety tips:
-
Tell every clinician you see
Inform your primary care provider, psychiatrist, gynecologist, and pharmacist that you are taking st johns wort. -
Check every medication and supplement for interactions
Review your full list (including over-the-counter products and other herbs) with a professional. -
Start low and monitor
- Begin with the lowest effective dose.
- Track changes in mood, sleep, energy, and side effects in a journal.
-
Watch for warning signs
- New or worsening anxiety, agitation, or insomnia
- Signs of mania (racing thoughts, decreased need for sleep, impulsive decisions)
- Symptoms of serotonin syndrome if combined with other serotonergic substances
-
Practice sun safety
- Use sunscreen daily, especially on the face, hands, and other exposed areas.
- Avoid tanning beds and limit midday sun exposure.
-
Don’t stop suddenly if you’ve used it long-term
Although not as well documented as with prescriptions, some people report withdrawal-like symptoms after abrupt discontinuation. Tapering under guidance is safer. -
Seek prompt help for serious symptoms
- Suicidal thoughts
- Severe mood swings or confusion
- High fever, muscle rigidity, or severe agitation
These are medical emergencies—contact emergency services or go to the ER.
St Johns Wort vs. Prescription Antidepressants
People often ask whether st johns wort is “better” than conventional antidepressants. The reality is more nuanced.
Potential advantages:
- For some individuals with mild to moderate depression, comparable effectiveness in studies.
- Often fewer sexual side effects and less weight gain than some antidepressants.
- Perceived as “more natural,” which some people prefer psychologically.
Potential disadvantages:
- Potent and complex drug interactions that many users (and even some clinicians) underestimate.
- Variability in potency and purity between brands and batches.
- Less evidence and regulation compared with prescription medications.
- Usually not appropriate for severe depression, psychosis, or complex psychiatric conditions.
For many, st johns wort might be considered only after a careful discussion of lifestyle interventions and well-studied treatments—and only when medication interactions are minimal.
Frequently Asked Questions About St Johns Wort
1. Is st johns wort good for depression?
St johns wort may help some people with mild to moderate depression, and clinical trials support its benefit in that specific group. It is not considered a first-line treatment for severe depression, and it should never replace urgent care for suicidal thoughts or major functional impairment. Always involve a healthcare professional before using it for depression.
2. Can you take st johns wort with antidepressants?
In most cases, you should not combine st johns wort with prescription antidepressants. Doing so increases the risk of serotonin syndrome and can complicate dosing and monitoring. Any combination must be managed closely by a psychiatrist or knowledgeable prescriber, and in most scenarios, they will recommend against using both together.
3. Does st johns wort affect birth control?
Yes. St johns wort can reduce blood levels of hormones in many oral contraceptives, potentially lowering their effectiveness and increasing the risk of unintended pregnancy and irregular bleeding. If you use hormonal birth control and are considering this herb, discuss non-hormonal backup methods or alternative mood treatments with your clinician.
Make an Informed Choice About St Johns Wort
St johns wort sits in a gray zone between “gentle traditional herb” and “powerful psychoactive agent with serious interactions.” It can be helpful for some people with mild to moderate depression, but it demands the same respect you’d give any prescription drug—careful dosing, interaction checks, and close monitoring.
If you’re considering st johns wort for mood, anxiety, PMS, or other concerns:
- Talk openly with a healthcare professional who understands both medications and supplements.
- Review your entire medication list for potential interactions.
- Choose a quality, standardized product and monitor your response over time.
Don’t navigate this alone or rely solely on anecdotal advice. Schedule a conversation with your doctor, psychiatrist, or a licensed integrative medicine practitioner before you start—or if you’re already taking st johns wort and have concerns. A brief, honest discussion now can help you protect your health while still exploring the natural options that matter to you.
Throughout history, many plants and herbs have been associated with luck, protection, and prosperity. To explore their deeper spiritual, psychological, and scientific significance, visit SpiritualMindScience.com.