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How Much Vitamin D Should You Take?

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Vitamin D is essential for preserving and maintaining health and plays a vital role in bone strength, our immune system, and many other physiological processes. While some vitamin D is absorbed through exposure to sunlight, it is also available in various food sources and supplements. However, it is essential to know that taking too much vitamin D can be harmful or even toxic; proper dosage amounts and precautions are vital when supplementing this nutrient.

This article aims to take an in-depth look at vitamin D, the recommended dosages for different age groups, and factors that can affect dosage requirements. We will also discuss the signs of vitamin D deficiency, sources of vitamin D, precautions, and possible side effects of taking too much of this vitamin.

Importance of vitamin D

Vitamin D is a fat-soluble vitamin essential for absorbing calcium and phosphorus in the body.1 These minerals are crucial for maintaining healthy teeth and bones. Vitamin D also helps to regulate the body’s immune function, neuromuscular function, and cellular growth.

Vitamin D sources

There are two primary sources of vitamin D- natural sources and supplementation.

Natural sources

The most natural source of vitamin D is exposure to sunlight. With enough exposure to natural sunlight, our skin beings producing vitamin D3. Some dietary sources of vitamin D include egg yolks, cheese, fatty fish, and fortified milk.

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Supplement sources

Vitamin D supplements are available in two forms: Vitamin D2 and vitamin D3. Vitamin D3 is the activated form the body produces when exposed to sunlight.

Recommended daily allowance (RDA):

The recommended daily vitamin D requirements vary depending on health status, age, and gender. The RDA for vitamin D for most adults is between 600 and 800 IU per day. However, some health experts recommend a higher dose of vitamin D for specific individuals, such as those with vitamin D deficiency, those over 65, or those with more limited sun exposure.

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Signs of vitamin D deficiency

Vitamin D deficiency can cause physical symptoms and increase the risk of certain health conditions.

Physical symptoms

Some common physical symptoms of vitamin D deficiency include fatigue, bone pain, muscle aches, and muscle weakness.

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Health risks

Long-term vitamin D deficiency can increase the risk of health issues such as osteoporosis, bone fractures, and certain cancers and can also lead to the development of autoimmune diseases while increasing the risk of cardiovascular disease.

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Risk groups

Individuals at a higher risk of vitamin D deficiency include people with limited sun exposure, older adults, individuals with darker skin pigmentation, and those following a vegetarian or vegan diet.

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Factors that affect the dosage of vitamin D

The recommended vitamin D dosage varies depending on health status, age, and gender.2 The recommended dosage for adults is between 600 and 800 IU per day. Children and infants require smaller amounts of vitamin D; the recommended daily dosage will vary depending on age, while adults over 65 generally require higher concentrations.
Several other factors can affect the amount of vitamin D that an individual requires, such as sun exposure, skin pigmentation, and geographical location making sun exposure little.

Health status

Individuals with certain health conditions such as kidney or liver disease, obesity, or malabsorption disorders may require more concentrated vitamin D doses to preserve optimal levels and health.


Infants, children, adolescents, and older adults have different vitamin D requirements. It is best to get a doctor’s recommendation.


Women, especially during pregnancy or breastfeeding, will require more vitamin D than men due to their increased need for nutrients and calcium.

Sun exposure

Sun exposure is one of the most significant factors affecting vitamin D levels. Those who live in areas with less sun exposure or spend most of their time indoors may require more vitamin D supplementation.


People who live in regions with less sun exposure, such as northern latitudes, may need more vitamin D from supplements or food.

Importance of consulting a healthcare provider

While it is essential to maintain optimal levels of vitamin D, it is equally vital to ensure not to exceed the safe limit. Always consult a healthcare provider before beginning any new supplement regimen, especially for those taking any medications (which may cause interactions) or have any underlying health conditions.

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Possible side effects

While vitamin D is generally safe and well tolerated by most individuals, some may experience side effects such as nausea, vomiting, constipation, or dehydration. We must remember to remain adequately hydrated while taking supplements.

Overdose precautions

While Vitamin D is crucial for good health, it is still possible to take too much of it. Overdosing on vitamin D can cause hypervitaminosis D, leading to kidney damage, calcification of soft tissues, and other serious health problems. Therefore, it is critical to understand the proper dosage amounts and take precautions when supplementing this vitamin.

Excessive amounts of vitamin D can cause toxicity and symptoms like weakness, fatigue, constipation, nausea, and vomiting. Exceeding recommended dosage limits can result in hypercalcemia, a condition where excess calcium in the blood can exacerbate other health issues.


Vitamin D is a crucial nutrient vital to maintaining overall health and well-being. Getting an adequate amount of this vitamin through a balanced diet, sunlight exposure, or supplements is essential. The recommended vitamin D dosage will vary depending on health status, age, and gender. Some individuals may require higher amounts than others for varying reasons.

In order to avoid deficiency, remember to consult with a healthcare provider about whether or not to supplement with vitamin D. Taking control of your health and taking the necessary measures to ensure you are getting enough vitamin D can help support your overall health.

Get an In-Home Vitamin D Shot

Vitamin D helps support healthy energy levels, mood, immune function, and more. Replenish low levels of this essential vitamin with in-home shots administered by one of our registered nurses.

Learn more or schedule an appointment today by clicking the button below!

Vitamin D Shots - Frequently Asked Questions

Can you take too much vitamin D?

Yes, it is possible to take too much vitamin D. Vitamin D is a fat-soluble vitamin, which means that it can build up in the body and potentially lead to toxic levels if it is consumed in large amounts. Vitamin D toxicity can cause hypercalcemia, a buildup of calcium in your blood. This condition can cause symptoms such as weakness, nausea, vomiting, frequent urination, kidney problems, and more.

How often do you need vitamin D shots?

Frequency of treatment depends on individual circumstances such as the severity of vitamin D deficiency, medical history, and other factors. However, most people may receive 1 – 3 shots over the course of a year.

Are vitamin D shots better than oral supplements?

Yes. Because vitamin D shots are given intramuscularly, the ingredients bypass your digestive system so that the full dose is available to your body for maximum benefits. Vitamin D shots are rapidly available for your cells to use.

What happens if you don’t treat vitamin D deficiency?

Not treating vitamin D deficiency can cause rickets, a rare but treatable condition that causes fatigue, frequent illnesses, depression, and impacts bone and muscle health. In children, vitamin D deficiency can impact normal growth and development.

Read more: Vitamin D Shots FAQ


[1] Chauhan K. - Vitamin D.;

[2] Bleizgys A. - Vitamin D Dosing: Basic Principles and a Brief Algorithm (2021 Update). ;