Vitamin A
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- Q What is the role of vitamin A in fetal development?
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Dr. Mehmet Oz, CardiologyVitamin A aids in both cell development and brain growth, but this vitamin does have a drawback. There have been links between excessive amounts of vitamin A and an increased risk of birth defects, especially neural tube defects. (Be careful of eating... Full Answer
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- Q Can vitamin A increase my risk for fractures?
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Dr. David Slovik, Endocrinology, Diabetes & MetabolismSeveral studies have found a link between high vitamin A intake and fractures. A study in The Journal of the American Medical Association found that postmenopausal women who got more than 3,000 micrograms (mcg) of vitamin A daily were more likely... Full Answer
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- Q Why is excessive vitamin A bad for your bone health?
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Dr. Michael Roizen, Internal MedicineSledgehammers aren't your only skeletal enemies. Getting more than 2,500 milligrams of vitamin A from supplements daily could hurt bone formation. You need some vitamin A, but there is such a thing as having too much. (Disregard this advice if you're... Full Answer
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- Q Should I worry about allergies with vitamin A?
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Avoid in individuals with a known hypersensitivity or allergy to vitamin A or any component of the formulation. You should read product labels, and discuss all therapies with a qualified healthcare provider. Natural Standard information does not... Full Answer
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- Q Do vitamin A supplements help to heal after photorefractive keratectomy?
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Photorefractive keratectomy is a type of laser eye surgery used to correct nearsightedness. High-dose vitamin A supplementation in addition to vitamin E has been suggested to help improve ocular healing after surgery and to improve visual acuity,... Full Answer
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- Q Does vitamin A help with skin damage caused by the sun?
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Some studies suggest that topical tretinoin (all-transretinoic acid, the acid form of vitamin A) may improve the appearance and integrity of photodamaged skin. Common adverse effects are skin pain and redness.You should read product labels, and discuss... Full Answer
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- Q Does vitamin A help with acute promyelocytic leukemia?
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The prescription drug all-transretinoic acid (ATRA, Vesanoid®) is a vitamin A derivative that is an established treatment for acute promyelocytic leukemia that improves median survival in this disease. Treatment should be under strict medical... Full Answer
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- Q What is the dosage for beta-carotene?
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Adults (18 years and older): 15-180 milligrams taken by mouth of supplemental beta-carotene has been studied for various indications. You should read product labels, and discuss all therapies with a qualified healthcare provider. Natural... Full Answer
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- Q What drugs may interact with beta carotene?
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Preliminary studies in animals indicate that beta-carotene supplementation, when combined with heavy alcohol consumption, may increase liver toxicity and promote cancer. Cigarette smoking decreases serum concentrations of beta-carotene and other... Full Answer
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- Q What herbs and supplements can interact with beta-carotene?
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Consumption of a natural carotenoid mixture has been shown to lower the increase in oxidative stress induced by the fish oil. This carotenoid mixture may also enhance the plasma triglyceride-lowering effect of the fish oil.Iron supplementation in infants... Full Answer
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