While it is possible to take enough vitamin D once a week to keep yourself balanced, the best results were found to be a lower dose (1,000-2,000 IUs or 25-50 mcg ) taken daily.
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.
It helps maintain healthy and strong bones and teeth. This is a high dose of vitamin D to be taken once weekly and not meant for daily consumption. It should be taken for a limited period only under a doctor's guidance. It is used for the treatment and prevention of vitamin D deficiency.
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.
There's no set time of day that's best to take vitamin D supplements. Some people say taking vitamin D supplements at night is an insomnia risk. There's no research to confirm this, but you might want to take your supplement earlier in the day if you think it's screwing with your sleep.
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.
If you've been prescribed high-dose vitamin D, work closely with your doctor to monitor your blood levels. It can take three months or more to bring them back up, but once they're good, you can stop the high doses and return to a lower vitamin D supplement for maintenance.
Some side effects of taking too much vitamin D include weakness, dry mouth, nausea, vomiting, and others. Taking vitamin D for long periods of time in doses higher than 4000 IU (100 mcg) daily is possibly unsafe and may cause very high levels of calcium in the blood.
Cholestyramine -- This cholesterol-lowering medication, known as a bile acid sequestrant, interferes with the absorption of vitamin D (as well as other fat-soluble vitamins). Phenobarbital, phenytoin, and other anticonvulsant medications -- These medications may accelerate the body's use of vitamin D.
Therefore, conditions that affect the gut and digestion, like celiac disease, chronic pancreatitis, Crohn's disease, and cystic fibrosis, can reduce vitamin D absorption.
Missed Dose
For use as a dietary supplement: If you miss taking a dietary supplement for one or more days there is no cause for concern, since it takes some time for your body to become seriously low in vitamins.
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 vitamin D supplement of 20 micrograms a day or 500 micrograms once a month. Don't worry - your doctor or pharmacist aren't trying to poison you!
Everyone (including children) should consider taking a daily supplement containing 10 micrograms (10µ) of vitamin D (400 IU), particularly during the winter months (October to March). It is specifically recommended that groups at higher risk of vitamin D deficiency take a daily supplement all year round.
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.
A meta-analysis of randomized controlled trials that compared the effects of vitamin D2 and D3 supplements on blood levels found that D3 supplements tended to raise blood concentrations of the vitamin more and sustained those levels longer than D2. [76,77] Some experts cite vitamin D3 as the preferred form as it is ...
A: The upper tolerable limit is 4,000 international units (IU) daily, and the recommended amount for women 14 to 70 is 600 IU per day. Women 71 and older should aim for 800 IU per day.
Can you take vitamin D and magnesium together? Yes. In fact, it's probably best to take both together. Because so many people have low magnesium levels, vitamin D supplements on their own aren't very helpful for a large portion of the population.
Growing evidence has demonstrated that vitamin D has a role in sleep regulation [12]. Specifically, vitamin D deficiency (VDD) can increase risk of sleep disorders and is associated with sleep difficulties, shorter sleep duration, and nocturnal awakenings in children and adults [13,14,15].
Vitamin D and sleep: The surprising connection
Early research suggests it is inversely related to melatonin, your sleep hormone. Increasing vitamin D levels may suppress melatonin levels. So, it makes sense that taking it at night could disrupt your sleep.
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.
Try to avoid taking your vitamins with coffee or tea
So, wait an hour after your morning brew to take supplements.
Many studies show that overweight and obese people have low vitamin D levels when compared to their slimmer counterparts. And some studies link increased belly fat to vitamin D deficiency. In fact, according to a Medical News Today article, an increase in overall body fat and low vitamin D seem to go hand in hand.