Is It Better To Take Vitamin D Every Day Or Once A Week?

Is It Better To Take Vitamin D Every Day Or Once A Week

The recommended dosage and frequency of vitamin D supplementation can vary depending on several factors, including individual needs, overall health, and medical advice. However, I can provide you with some general information.

For individuals who have vitamin D deficiency or are at risk of deficiency, daily or weekly supplementation is commonly recommended. The optimal dosage and frequency should be determined by a healthcare professional based on factors such as age, existing health conditions, and blood test results.

A common approach for treating vitamin D deficiency is to take a higher dose once a week, such as 50,000 international units (IU), for a specific duration under medical supervision. Afterward, a maintenance dose may be prescribed, typically taken daily or weekly, depending on the individual’s needs.

It’s important to note that excessive vitamin D supplementation can have adverse effects. Therefore, it is always best to consult with a healthcare professional who can evaluate your specific situation and provide appropriate recommendations. They will consider your health history, and any existing medical conditions, and may order blood tests to assess your vitamin D levels before suggesting a suitable dosage and frequency.

What Happens If I Take Too Much Vitamin D?

Taking excessive amounts of vitamin D can lead to a condition called vitamin D toxicity or hypervitaminosis D. Vitamin D is a fat-soluble vitamin, which means it can accumulate in the body over time if taken in excessive amounts. Here are some potential effects of taking too much vitamin D:


Vitamin D regulates calcium absorption in the body. Excess vitamin D can lead to increased calcium levels in the blood, resulting in symptoms like nausea, vomiting, loss of appetite, frequent urination, excessive thirst, constipation, abdominal pain, weakness, and confusion.

Kidney damage

High levels of vitamin D can cause calcium buildup in the kidneys, potentially leading to kidney stones or even kidney damage.

Bone loss

Surprisingly, excessive vitamin D can paradoxically result in bone loss. It can cause the body to absorb too much calcium from the intestines, leading to calcium depletion from the bones.

Soft tissue calcification

When calcium levels in the blood are elevated due to vitamin D toxicity, calcium can be deposited in soft tissues, such as the heart, blood vessels, and lungs. This can interfere with their normal function.

Digestive issues

Some individuals may experience digestive symptoms like nausea, vomiting, diarrhea, or stomach pain when taking excessive amounts of vitamin D.

It’s important to note that the tolerable upper intake level (UL) for vitamin D varies depending on age, sex, and specific health conditions. For most adults, the recommended daily allowance (RDA) is around 600-800 international units (IU) per day. However, the safe upper limit is generally considered to be 4,000 IU per day for adults. It is always recommended to consult with a healthcare professional or a registered dietitian before significantly increasing your vitamin D intake or taking supplements to ensure you are within safe limits.

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