how many times a day should you take vitamin d?
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Bottom line: Vitamin D intake is recommended at 400–800 IU/day, or 10–20 micrograms. However, some studies suggest that a higher daily intake of 1000–4000 IU (25–100 micrograms) is needed to maintain optimal blood levels.
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50,000 IU capsules are available by prescription only. If your blood levels are exceptionally low, you may need higher doses that should be used under the direction of a healthcare provider. In patients with vitamin D levels less than 20 ng/mL, start with 50,000 IUs of vitamin D3 once a week for 6 – 8 weeks.
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Depending on which prenatal vitamin you have chosen, you may take it once a day or multiple times per day. Follow the instructions provided to gain the maximum benefits. For example, many vitamins work best when taken with water and on an empty stomach with no food consumed for about an hour following.
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In people whose 25-hydroxyvitamin D (25[OH]D) is <12 ng/mL (30 nmol/L), treatment usually includes 50,000 international units (1250 micrograms) of vitamin D2 or D3 by mouth once or more per week for six to eight weeks, and then 800 to 1000 international units (20 to 25 micrograms), or more, of vitamin D3 daily ...
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Basically, calcium functions as a structural building block for bones, while, vitamin D facilitates the absorption of calcium in the body. According to the Institute of Medicine of the National Academics, a normal adult should take 1000 milligram per day of calcium, while 600 milligram per day of vitamin D.
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Most multivitamins should be taken once or twice a day. Make sure to read the label and follow the recommended dosage instructions.
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['Adults—250 to 500 milligrams (mg) 2 times a day, taken every 12 hours for 7 to 14 days.', 'Children—Dose is based on body weight and must be determined by your doctor.']
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The daily upper limit for vitamin D is 25 mcg to 38 mcg (1,000 to 1,500 IU) for infants; 63 mcg to 75 mcg (2,500 to 3,000 IU) for children 1-8 years; and 100 mcg (4,000 IU) for children 9 years and older, adults, and pregnant and lactating teens and women.
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Adults—At first, 7.5 milligrams (mg) once a day. Your doctor may increase your dose as needed. However, the dose is usually not more than 15 mg once a day.
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However, 1,000 to 2,000 IU per day of vitamin D from a supplement is generally safe, should help people achieve an adequate blood level of vitamin D, and may have additional health benefits.
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The Institute of Medicine has placed the recommended dietary allowance, or RDA, for vitamin D at 600 international units (IU) per day for young adults and 800 IU per day for adults older than 70. Other experts suggest that adults' vitamin D needs are much higher.
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Vitamin D supplements can be taken with or without food and the full amount can be taken at one time. While your body needs vitamin D to absorb calcium, you do not need to take vitamin D at the same time as a calcium supplement.
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Mayo Clinic recommends that adults get at least the RDA of 600 IU. However, 1,000 to 2,000 IU per day of vitamin D from a supplement is generally safe, should help people achieve an adequate blood level of vitamin D, and may have additional health benefits.
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Vitamin D aids in the absorption of calcium and phosphorus, two essential minerals for maintaining bone health and strength. Just one half-cup serving of mushrooms provides 100 percent of the recommended daily vitamin D intake.
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Getting the right vitamins But the sun isn't all bad. Just 10–15 minutes of daily exposure helps manufacture vitamin D throughout the skin. Vitamin D is one of the best vitamins for your skin, along with vitamins C, E, and K. Making sure you get enough vitamins can keep your skin looking healthy and youthful.
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100 IU (2.5 mcg) per day increases vitamin D blood levels 1 ng/ml (2.5 nmol/L). 200 IU (5 mcg) per day increases vitamin D blood levels 2 ng/ml (5 nmol/L). 400 IU (10 mcg) per day increases vitamin D blood levels 4 ng/ml (10 nmol/L). 500 IU (12.5 mcg) per day increases vitamin D blood levels 5 ng/ml (12.5 nmol/L).
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This guideline recommends a minimum vitamin D level of 20 ng/mL, but to guarantee sufficiency they recommend between 30 and 50 ng/mL for both children and adults. In contrast, the Vitamin D Council states that even levels between 30 and 40 ng/mL are still not quite sufficient.