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Evidence-Based Supplement Research
Evidence-Based Supplement Research

St. John's Wort

Safety profile

6 studies reporting safety data2 serious adverse events

Across 6 clinical studies, St. John's Wort was generally described as well tolerated, with no quantitative adverse event findings indicating increased risk compared to control. Two serious adverse events were flagged, including serotonin syndrome risk when combined with other serotonergic agents, and drug interactions involving CYP 450 substrates were noted as safety concerns.

Caveats: Most reports are qualitative and not from controlled safety analyses; studies were often designed for efficacy rather than safety, and long-term safety data are limited. The evidence base is small (6 studies), so the absence of reported adverse events does not establish comprehensive safety.

Most-studied combinations with St. John's Wort

most supplement research is combination research
Also studied with:Passion Flower (2), Lavender (3), Ginkgo (2), Saffron (2)
  • St. John's Wort Herb

    By Nature's Way

    4.5 (3.9K reviews)
    Out of Stock
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    iHerb
    $14.31
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  • Bye-Lori Plus

    By Life Enhancement

    4.3 (299 reviews)
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    iHerb
    $72.70
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  • St. John's Wort

    By Solaray

    4.5 (247 reviews)
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    iHerb
    $17.49
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  • St. John's Wort 450

    By Source Naturals

    4.5 (244 reviews)
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    iHerb
    $22.79
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  • St. John's Wort

    By NOW Foods

    4.5 (1.4K reviews)
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    iHerb
    $20.81
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  • St. John's Wort Extract

    By Lake Avenue Nutrition

    4.6 (3.2K reviews)
    In Stock
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    iHerb
    $19.06
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