what is maximum vitamin d?
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All things considered, a daily vitamin D intake of 1000–4000 IU, or 25–100 micrograms, should be enough to ensure optimal blood levels in most people. 4000 IU is the safe upper limit according to the Institute of Medicine (IOM). Make sure not to take more than that without consulting with a health professional.
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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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If you're breastfeeding, you should consider taking a vitamin D supplement (containing 10mcg). If your baby is only having breast milk (no first infant formula top-ups), you should give them a daily vitamin D supplement of 8.5 to 10mcg. It's worth checking if you're entitled to Healthy Start food and vitamin vouchers.
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Current guidelines say adults shouldn't take more than the equivalent of 100 micrograms a day. But vitamin D is a 'fat-soluble' vitamin, so your body can store it for months and you don't need it every day. That means you could equally safely take a supplement of 20 micrograms a day or 500 micrograms once a month.
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800 IU (20 mcg) per day increases vitamin D blood levels 8 ng/ml (20 nmol/L). 1000 IU (25 mcg) per day increases vitamin D blood levels 10 ng/ml (25 nmol/L).
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If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people. Do not take more than 100 micrograms of vitamin D a day as it could be harmful. This applies to adults, including pregnant and breastfeeding women and the elderly, and children aged 11 to 17 years.
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If you're taking a vitamin D supplement, you probably don't need more than 600 to 800 IU per day, which is adequate for most people. Some people may need a higher dose, however, including those with a bone health disorder and those with a condition that interferes with the absorption of vitamin D or calcium, says Dr.
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A: There are two different forms of vitamin D: D2 (ergocalciferol) and D3 (cholecalciferol). The prescription-strength vitamin D is ergocalciferol (Drisdol) and comes in a dose of 50,000 international units (IU), which is usually taken once a week.
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Vitamin D is fat soluble, which means you need to eat fat to absorb it. Foods high in vitamin D include fish, mushrooms exposed to sunlight, fortified milk, fortified milk substitutes, fortified tofu, fortified yogurt, fortified breakfast cereals, fortified orange juice, pork chops, and eggs.
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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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Today, many countries still use the IU to measure vitamin D; 1 IU of vitamin D is equivalent to 0.025 micrograms (abbreviated as either mcg or μg) of cholecalciferol or ergocalciferol. Conversely, 1 microgram of vitamin D equals 40 IU of vitamin D.
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Normal values are 75-100 nmol/L (30-40 ng/ml). Vitamin D deficiency is defined if serum hydroxyvitamin D levels are less than 50nmol/L (20 ng/ml), insufficiency as 50-75 nmol/L (20-30 ng/ml). Studies demonstrate that vitamin D is essential also for overall health and well-being.
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One USP unit of vitamin D2 is equivalent to one International Unit (IU), and 1 mcg of vitamin D2 is equal to 40 USP Units. Each capsule contains Vitamin D (Ergocalciferol) 1.25 mg equivalent to 50,000 USP Units in an edible vegetable oil.
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Dwyer says vitamin D, calcium, and folic acid are three nutrients you may get too much of, especially through supplements. Adults who regularly far exceed the 4,000 international units (IUs) daily safe upper limit for vitamin D might may end up with serious heart problems.
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Continue giving your baby vitamin D until you wean your baby and he or she drinks 32 ounces (about 1 liter) a day of vitamin D-fortified formula or, after age 12 months, whole cow's milk.
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The short answer is from food, the sun or supplements. There are two main kinds of vitamin D—vitamin D2 and vitamin D3—which you can get from (and occur naturally in) certain foods like salmon, tuna, mackerel and beef liver and egg yolks.
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Make sure not to take more than that without consulting with a health professional. 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.