People can pop a lot at once, even a week's worth at a single sitting, with no adverse effects. And unlike the other fat-soluble vitamins, A, E and K, the sunshine vitamin is absorbed well without food, so it can be taken any time. "Take it on a full stomach, take it on an empty stomach.
High doses of vitamin D can cause hypercalcemia without toxicity symptoms, but can also cause toxicity symptoms without hypercalcemia ( 30 ). To be safe, do not exceed the 4,000 IU (100 mcg) upper limit without consulting a doctor or dietitian.
The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause nausea and vomiting, weakness, and frequent urination. Vitamin D toxicity might progress to bone pain and kidney problems, such as the formation of calcium stones.
The dose at which vitamin D supplements become toxic isn't clear. But it would need to be very high -- way above the amount most doctors usually prescribe. Research shows that taking 60,000 international units (IU) of vitamin D a day for several months can cause toxicity.
For oral dosage form (capsules): Adults, teenagers, and children over 10 years of age—At first, 300 to 350 micrograms (mcg) a week, taken in divided doses either once a day or every other day. Your doctor may change your dose if needed. Children 2 to 10 years of age—50 mcg a day.
We recommend taking it with a source of quality fat in the morning or when you break your fast. Avoid taking vitamin D in the evening (we'll talk about why below). Since vitamin D is a fat-soluble vitamin—meaning it doesn't dissolve in water—your body can most easily absorb it when you take it with food.
Taken in appropriate doses, vitamin D is generally considered safe. However, taking too much vitamin D in the form of supplements can be harmful. Children age 9 years and older, adults, and pregnant and breastfeeding women who take more than 4,000 IU a day of vitamin D might experience: Nausea and vomiting.
Take vitamin D by mouth as directed. Vitamin D is best absorbed when taken after a meal but may be taken with or without food. Alfacalcidol is usually taken with food. Follow all directions on the product package.
Don't use calcium, zinc, or magnesium supplements at the same time. Also, these three minerals are easier on your tummy when you take them with food, so if your doctor recommends them, have them at different meals or snacks.
There are quite a few differences between vitamin D and vitamin D3, but the main difference between them is that vitamin D is a fat-soluble vitamin that regulates calcium and phosphorous levels in the body, whereas the vitamin D3 is the natural form of vitamin D produced by the body from sunlight.
Extra amounts of water-soluble vitamins are typically excreted. The fat-soluble vitamins A and D are the most likely to cause toxicity symptoms if you consume them in high amounts.
You'll be sleepy the next day. Several studies even saw a dose-dependent relationship between vitamin D levels and sleep. [1,2] This adds to the evidence that there is a direct, linear relationship between vitamin D and sleep measures. This also means that improving your vitamin D by any amount will improve your sleep.
Because vitamin D is fat soluble, its absorption depends on the gut's ability to absorb dietary fat [4]. Fat malabsorption is associated with medical conditions that include some forms of liver disease, cystic fibrosis, celiac disease, Crohn's disease, and ulcerative colitis [1,63].
Taking it with a fruit, tea, coffee, or in-between meals won't let the absorption happen,” she says. “For better absorption of vitamin D, you must include vitamin K, magnesium, and zinc in your diet. They speed up the absorption procedure and reduce your likelihood of being vitamin D deficient,” she suggests.
You don't absorb enough vitamin D from food (a malabsorption problem) You don't get enough exposure to sunlight. Your liver or kidneys cannot convert vitamin D to its active form in the body. You take medicines that interfere with your body's ability to convert or absorb vitamin D.
Midday, especially during summer, is the best time to get sunlight. At noon, the sun is at its highest point, and its UVB rays are most intense. That means you need less time in the sun to make sufficient vitamin D ( 5 ). Many studies also show that the body is most efficient at making vitamin D at noon ( 6 , 7 ).
Should You Take Vitamin D On An Empty Stomach? Ideally, no. As a fat-soluble vitamin, pure vitamin D isn't well absorbed in its pure form unless there's a fat source present, which is why it's generally recommended to consume alongside food unless it's emulsified with fat.
Magnesium assists in the activation of vitamin D, which helps regulate calcium and phosphate homeostasis to influence the growth and maintenance of bones. All of the enzymes that metabolize vitamin D seem to require magnesium, which acts as a cofactor in the enzymatic reactions in the liver and kidneys.
Yes! You can and should take magnesium and vitamin D together. In fact, the bioavailability of vitamin D largely relies on magnesium. Also, many nutrients wouldn't work efficiently without magnesium, further highlighting the importance of this mineral!
Magnesium can help boost vitamin D levels. Here are foods that are rich in these minerals. If you're looking to get more vitamin D in your diet, take it with a side of magnesium. That mineral appears to help regulate levels of vitamin D, which in turn manages the levels of other minerals such as calcium and phosphorus.
Combining supplements will not normally interfere with the way they work and in some cases may be beneficial, for example vitamin C helps iron absorption.
Vitamins D, E and K
“Studies have shown that a person's absorption of Vitamin K may be reduced when other fat-soluble vitamins such as Vitamin E and Vitamin D are taken together,” says Dr. Chris Airey, M.D. “It's advised that you take these vitamins at least 2 hours apart to maximize your absorption.”
High-dose vitamins can turn your pee a bright, almost neon yellow color. The most common culprit is vitamin B2, also known as riboflavin, which is found in most multivitamins. The neon color in pee is just a harmless sign that you're taking more than your body needs, and the excess is mixing with your pee.