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Side effects from a standard dosage of vitamin C can include heartburn, stomach cramps, nausea, vomiting, headache and others, according to WebMD. High daily doses of vitamin C may cause numerous side effects, including ... More »

Most people experience no negative side effects when taking vitamin C in recommended dosages, according to WebMD. However, nausea, vomiting, heartburn, stomach cramps and headache occasionally occur, particularly in peop... More »

No serious side effects have been reported from ingesting small amounts of apple cider vinegar on a regular basis, but WebMD notes insufficient evidence to prove any effectiveness for weight loss. Low potassium levels ma... More »

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Side effects of vinpocetine include nausea, sleep disturbances, pain in the stomach, dizziness and headache, as listed by WebMD. Patients may also experience flushing of the face or nervousness. More »

Side effects of red rice yeast include headache, stomach ache, bloating or gas, dizziness, heartburn and muscle aches and weakness, according to University of Maryland Medical Center. Pregnant and breastfeeding women and... More »

Side effects of St. John's wort include headache, muscle cramps, anxiety, restlessness and irritability, states WebMD. Stomach upset, fatigue, dry mouth, dizziness and skin rash may also occur. Taking St. John's wort in ... More »

Common potential side effects of aspirin include heartburn, stomach cramps, vomiting, nausea and drowsiness. Serious side effects include anemia, bronchospasm, bleeding of the intestines, hemorrhage within the skull and ... More »