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Herb · in-depth review

St. John's Wort

St. John's Wort

St. John's wort uses an aerial-part extract; hypericin and hyperforin are common constituents, used for everyday scale support of mild low mood.

Also known asHypericum perforatum
Related symptomsLow mood

Marked asPrimarySupporting

Primary

Eases mild low mood

Aerial-part extract can affect monoamine reuptake and nerve-transmission–related signals; scale scores of mild low mood often fall in trials. People who cannot get going and feel nothing for things they usually like more often see change in mood swings after several continuous weeks.

Primary

Helps settle menopausal mood

Some trials put St. John's wort on menopausal irritability, anger, and mood swings that ride with hot flushes; plant constituents and mood scales meet here. People with waves of heat and a restless mind more often see a difference in steadier mood and more continuous sleep after several continuous weeks.

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With foodTake with or after food to ease stomach irritation
Best timeFor alertness or daytime use, choose morning or midday; for sleep or relaxation, choose after dinner through bedtime
SolubilityFat-soluble, Water-dispersible

After 4-8 weeks of continuous use, review actual benefit and tolerance.

General wellnessTypical daily intake for general wellness: standardized extract often 300 mg、2–3 times daily (total 600–900 mg)
Specific needsTypical adult daily safety upper limit is about 1,800 mg; it has strong interactions with many medicines, ask a clinician first, and do not exceed this on your own long term.

How oftenGenerally can be used daily and adjusted to individual response.

Cautions

Depressive symptoms or current medicines: must ask a clinician first.

If symptoms persist or worsen, seek medical help promptly.

Interactions

  1. CYP3A4 / P-gp induction: oral contraceptives, immunosuppressants, some HIV and cancer medicines
  2. Antidepressants (serotonin-syndrome risk)
  3. Warfarin
  4. Some heart medicines and antiseizure drugs
Common side effects

· Mild gastrointestinal discomfort or an unfamiliar taste may occur.

Rare but important

· Some people may have allergic reactions or interactions with medicines.

Long-term dependenceNo typical addiction evidence; do not self-use high long-term doses just to speed results.

Sources

These are institution pages you can check—not a certification of this ingredient.

Medical disclaimerThis page is compiled by the HerbBB editorial team for general health information only. It is not a substitute for advice from a doctor, pharmacist, or other qualified clinician. If you have a health condition, take medicines, or are pregnant or breastfeeding, speak with a professional first.