Vitamins and supplements like melatonin and fish oil offer health benefits but can cause side effects if misused. Learn about the impact of saw palmetto on blood pressure and find the best multivitamins for young women and adults over 50.
Too much iron can darken stools, which is common for people taking iron supplements. Although iron-rich foods don't typically cause the same effect as iron pills, some deeply hued fare can turn your stool a different color, making you look twice after using the restroom.
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While iron deficiency is one possible cause of hair loss in women, Harvard Medical School reports that taking iron supplements is not proven to help women regrow their hair.
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Although vitamin C is an essential nutrient you need for healthy cells and proper immune function, too much of it can cause unpleasant side effects. Taking too many vitamin C tablets may result in upset stomach, abdominal cramps and diarrhea.
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Because your body doesn't make L-lysine on its own, you must get this amino acid from foods or supplements. You need about 1 gram of L-lysine per day, according to New York University Langone Medical Center, but people who eat protein-rich diets tend to get enough without supplementation.
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Spirulina is a nutrient-rich blue-green algae found in supplements and some health foods. According to the University of Maryland Medical Center, a typical daily dose of spirulina is 2,000 to 3,000 milligrams, usually consumed in four to six portions of 500 milligrams each.
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