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The Daily Insight

Why does my body not absorb vitamin D

Author

Ava Hall

Published Apr 12, 2026

Your digestive tract cannot adequately absorb vitamin D. Certain medical problems, including Crohn’s disease, cystic fibrosis, and celiac disease, can affect your intestine’s ability to absorb vitamin D from the food you eat.

What causes Vit D to not be absorbed?

Vitamin D deficiency can be caused by specific medical conditions, such as: Cystic fibrosis, Crohn’s disease, and celiac disease: These diseases do not allow the intestines to absorb enough vitamin D through supplements. Weight loss surgeries.

Why can't I absorb vitamin D from the sun?

Your body can’t make vitamin D if you’re sitting indoors by a sunny window because ultraviolet B (UVB) rays (the ones your body needs to make vitamin D) can’t get through the glass. The longer you stay in the sun, especially for prolonged periods without sun protection, the greater your risk of skin cancer.

How do I get my body to absorb vitamin D?

Vitamin D is a fat-soluble vitamin, meaning that it does not dissolve in water and is absorbed best in your bloodstream when paired with high-fat foods. For this reason, it’s recommended to take vitamin D supplements with a meal to enhance absorption.

How long does it take to recover from vitamin D deficiency?

“If you put people on 2,000-4,000 [milligrams] of vitamin D based on what their deficient value was, you can usually get them corrected in four to six weeks, which is when you are really going to need the vitamin D.

Does magnesium help you absorb vitamin D?

“Adequate levels of magnesium in the body are essential for the absorption and metabolism not only of vitamin D but of calcium as well,” Dean states. “Magnesium converts vitamin D into its active form so that it can help calcium absorption.

Which form of vitamin D is best absorbed?

In our study, the microencapsulated form of vitamin D was the most bioavailable.

What should you not take with vitamin D?

High doses of vitamin D can cause hypercalcemia, which increases the risk of fatal heart problems with digoxin. Diltiazem (Cardizem, Tiazac, others). Avoid taking high doses of vitamin D with this blood pressure drug. High doses of vitamin D can cause hypercalcemia, which might reduce the drug’s effectiveness.

Can I take 60000 IU of vitamin D daily?

25OHD blood levels were 31.4, 102, 164, 148, and 143ng/ml. No one developed hypercalcemia or any adverse events. The major finding of this case series is prolonged daily dosing of vitamin D3 with doses of 10,000 to 60,000 IU was safely tolerated.

Can you get vitamin D through clothes?

If you wear clothing that covers most of your skin, you may be at risk for vitamin D deficiency. This also means that people who train indoors during winter months may have to dig into their bodies’ vitamin D stores if they don’t consume enough, which further increases their risk for deficiency.

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Can I get vitamin D on a cloudy day?

Am I still getting vitamin D when I’m outside on a gray, cloudy day? A. Just as it is possible to get a sunburn on an overcast day, it is possible to get the ultraviolet-B radiation needed for the skin to synthesize vitamin D even when skies are cloudy and gray.

Does coffee affect vitamin D absorption?

Caffeine inhibits vitamin D receptors, which limit the amount that will be absorbed. Because vitamin D is important in the absorption and use of calcium in building bone, this could also decrease bone mineral density, resulting in an increased risk for osteoporosis.

Can a vitamin D deficiency cause weight gain?

A vitamin D deficiency is unlikely to cause weight gain. However, it may cause other health problems or unpleasant symptoms, which are worth avoiding. You can maintain adequate vitamin D levels through a combination of limited sun exposure, a vitamin-D-rich diet, and taking vitamin D supplements.

How can I check my vitamin D levels at home?

Everlywell Vitamin D Test Everlywell is an online company that offers a variety of at-home test kits and ships within the U.S. An Everlywell vitamin D test involves a person taking a finger-prick blood sample. Results will show whether a person’s vitamin D levels are elevated, adequate, or suboptimal.

Is vitamin D3 better than vitamin D?

Scientists are not sure if one is better than the other, although some studies have found that D3 is more effective in raising vitamin D levels in the body than D2. Vitamin D2 comes from plants, while animals, including people, produce D3. Few foods naturally contain vitamin D.

What is a normal vitamin D level for a woman?

A level of 20 nanograms/milliliter to 50 ng/mL is considered adequate for healthy people. A level less than 12 ng/mL indicates vitamin D deficiency.

Which is better vitamin D drops or pills?

In conclusion, our results show that vitamin D administered as oil drops was equally effective as powdered tablets in raising S-25-OHD concentrations. This is an important finding with clinical implications.

Can I take zinc magnesium and vitamin D together?

Interactions between your drugs No interactions were found between Calcium, Magnesium and Zinc and Vitamin D3. This does not necessarily mean no interactions exist. Always consult your healthcare provider.

What type of magnesium is best for vitamin D absorption?

Magnesium citrate is a popular form of magnesium. It is often an ingredient in supplements and appears to be easier for the body to absorb than some other forms. An older 2003 study of 46 adults found that magnesium citrate absorbed better than magnesium oxide and magnesium chelate.

What vitamins should not be taken together?

  • Vitamin C with vitamin B-12.
  • Vitamin A supplement with vitamin A-rich foods.
  • Folic acid (vitamin B9) and vitamin B12.
  • Vitamin E and vitamin K.

What is the maximum amount of vitamin D you can take daily?

Unless your doctor recommends it, avoid taking more than 4,000 IU per day, which is considered the safe upper limit.

Is 10000 IU of vitamin D enough?

The Endocrine Society Practice Guidelines recommend that up to 10,000 IUs daily was safe for adults. This is in contrast to the recommended UL at 4,000 IU/d from the IOM.

Can I take 2000 IU of vitamin D daily?

The Vitamin D Council recommends that healthy adults take 2,000 IU of vitamin D daily — more if they get little or no sun exposure. There’s evidence that people with a lot of body fat need more vitamin D than lean people.

Which fruit is rich in vitamin D?

Orange. There are limited Vitamin D fruits. Around 75% of the people worldwide are either allergic to dairy products or are lactose intolerant, and some of them are vegan. So, orange or orange juice is the best option with vitamin D and other nutrients such as calcium.

Can I take 5000 IU of vitamin D3 everyday?

In summary, long-term supplementation with vitamin D3 in doses ranging from 5000 to 50,000 IUs/day appears to be safe.

Can you take vitamin D3 once a week?

Oral vitamin D3 can be taken once a day but also with longer intervals because of its long half life, being around 25 days. It is not known whether equivalent doses once a week or once a month are equally effective.

Is only morning sun good for vitamin D?

Not many realise that It’s only the early morning sun — that is, from 7 am to 9 am — that helps generate Vitamin D. After 10 am, exposure to sunlight is harmful for the body.

Is 5pm sunlight good for vitamin D?

04/10​The best time to be out in the Sun The best time to soak yourself in the sun to get the maximum vitamin D is between 10 am to 3 pm. At this time, the UVB rays are intense and it is also said that the body is more efficient in making vitamin D at this time.

Can you get vitamin D after 5 pm?

If your shadow is longer than your body height, you can’t make any vitamin D,” Holick says. Between 10 a.m. to 3 p.m. is the usual window for significant sun exposure, he says.

How much vitamin D do you get from 10 minutes in the sun?

If you’re fair skinned, experts say going outside for 10 minutes in the midday sun—in shorts and a tank top with no sunscreen—will give you enough radiation to produce about 10,000 international units of the vitamin.

What time is vitamin D in sun?

Sensible sun exposure, especially between the hours of 10:00 am and 3:00 pm produces vitamin D in the skin that may last twice as long in the blood compared with ingested vitamin D.