Warning: Do Not Mix These Supplements

Even the most common supplements can have surprising interactions with drugs and other supplements.

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St. John's wort

Drug interactions: Taking St. John's wort with antidepressants may lead to too-high levels of serotonin in your body, which can result in serious side effects including heart problems. St. John's wort may make birth control pills pless effective. It may also interact with common migraine medications such as sumatriptan and zolmitriptan.

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