Can Vitamin D Deficiency Cause Hair Loss?

can vitamin D deficiency cause hair loss

Vitamin D deficiency has been linked with several health conditions. When you start shedding a lot of hair, the instinct tells you to get Vitamin D and Calcium checked. But can vitamin D deficiency cause hair loss?

Some evidence suggests a link between vitamin D deficiency and hair loss, but the relationship is not fully understood.

Usually, hair loss or alopecia may have multiple causes, such as genetics, hormonal imbalances, nutritional deficiencies, autoimmune disorders, etc.

Vitamin D is acknowledged to play a role in hair follicle cycling and function, so it is plausible that a deficiency could contribute to hair loss. These receptors are present in hair follicles, and studies have shown that vitamin D stimulates hair follicle growth and activates the hair growth cycle.

Additionally, vitamin D has anti-inflammatory effects, and inflammation can potentially disrupt the hair growth process. Some research suggests that low levels of vitamin D may be associated with certain types of hair loss, such as alopecia areata, which is an autoimmune condition that causes patchy hair loss.

However, it’s important to note that hair loss is a complex issue with multiple contributing factors, and it is rarely caused by a single nutrient deficiency, hence the question remains, can vitamin D deficiency cause hair loss? Other nutritional deficiencies, such as iron or zinc deficiency, can also impact hair health.

Other Causes of Hair Loss

Can Vitamin D Deficiency Cause Hair Loss

We often wonder, can vitamin D deficiency cause hair loss alone? Well, no! Hair loss can be caused by various factors, including:


The most common cause of hair loss is hereditary pattern baldness, also known as androgenetic alopecia. This type of hair loss is influenced by genetic factors and hormonal changes and can affect both men and women.

Hormonal Changes

Hormonal imbalances due to conditions such as pregnancy, childbirth, menopause, or thyroid disorders can contribute to hair loss. Hormones can affect the hair growth cycle and lead to temporary or permanent hair loss.

Medical Conditions

Certain medical conditions and diseases can cause hair loss, including alopecia areata (an autoimmune disorder), scalp infections (such as ringworm), trichotillomania (a hair-pulling disorder), and conditions like lupus or diabetes.

Nutritional Deficiencies

Inadequate intake of essential nutrients, such as iron, zinc, biotin, or vitamin D, can affect the health of your hair and lead to hair loss.


Experiencing significant physical or emotional stress, such as a traumatic event, major surgery, or chronic stress, can disrupt the hair growth cycle and contribute to hair loss. Various neurological symptoms are the result of vitamin D deficiency.

Medications and Treatments

Some medications, such as certain antidepressants, blood thinners, chemotherapy drugs, and radiation therapy, can cause hair loss as a side effect. Additionally, excessive use of styling tools, chemical treatments, and tight hairstyles can damage the hair follicles and lead to hair loss.


Hair loss tends to be more common as people age. As we get older, hair follicles may shrink and produce thinner and shorter hair, leading to overall hair thinning.

It’s important to note that the specific cause of hair loss can vary from person to person. If you are experiencing significant hair loss or have concerns about your hair, it is recommended to consult a healthcare professional or a dermatologist. They can evaluate your condition, identify the underlying cause, and provide appropriate treatment options or lifestyle recommendations.

Labs to Identify Vitamin D Deficiency

Can Vitamin D Deficiency Cause Hair Loss

One wonder can vitamin D deficiency cause hair loss and can be the only reason. To detect vitamin D deficiency, healthcare professionals commonly use blood tests to measure the levels of 25-hydroxyvitamin D [25(OH)D], also known as calcidiol, in the blood. This is the primary circulating form of vitamin D.

The most commonly used blood test to assess vitamin D levels is the 25-hydroxyvitamin D test. There are two types of this test:

  1. 25(OH)D Total Test: This test measures the total amount of 25-hydroxyvitamin D in the blood, including both the active form (calcitriol) and the inactive form (calcidiol).
  2. 25(OH)D D2 and D3 Test: This test specifically measures the levels of vitamin D2 and vitamin D3, which are the two major forms of vitamin D.

These blood tests are typically performed using a simple blood draw. The results are usually reported in nanograms per milliliter (ng/mL) or nanomoles per liter (nmol/L).

Interpretation of the test results may vary slightly between laboratories, but generally, the following ranges are used to assess vitamin D status:

  • Deficient: <20 ng/mL or <50 nmol/L
  • Insufficient: 20-29 ng/mL or 50-74 nmol/L
  • Sufficient: 30-100 ng/mL or 75-250 nmol/L
  • High: >100 ng/mL or >250 nmol/L

It’s important to note that optimal vitamin D levels can vary based on individual factors and guidelines from different organizations. Healthcare professionals will consider factors such as age, health conditions, and individual needs when interpreting the test results and determining appropriate treatment or supplementation if necessary.

Why is Vitamin D Important for Our Body

Vitamin D is an essential nutrient that plays numerous important roles in the body. At the first sign of hair fall, it is natural to think can vitamin D deficiency cause hair loss? Here are some key reasons why vitamin D is important:

  1. Calcium Absorption: Vitamin D aids in the absorption of calcium from the intestines. It helps regulate calcium levels in the blood, which is crucial for maintaining strong bones and teeth. Sufficient vitamin D levels are necessary for the proper formation and mineralization of bones, preventing conditions like rickets in children and osteoporosis in adults.
  2. Bone Health: Vitamin D works in conjunction with calcium to promote bone health and density. It helps regulate the balance between bone formation and bone resorption, which is the natural process of breaking down old bone tissue and replacing it with new bone tissue.
  3. Immune Function: Vitamin D plays a role in modulating immune system function. It helps regulate immune responses and has anti-inflammatory properties. Sufficient levels of vitamin D are associated with a lower risk of certain autoimmune diseases and infections.
  4. Muscle Function: Vitamin D is involved in muscle function and strength. It helps maintain proper muscle function and may reduce the risk of falls and fractures in older adults.
  5. Cell Growth and Differentiation: Vitamin D is involved in the regulation of cell growth and differentiation, which is important for overall health and the prevention of certain types of cancer.
  6. Mood and Mental Health: Some studies suggest a link between vitamin D deficiency and mood disorders like depression and seasonal affective disorder (SAD). Adequate vitamin D levels may play a role in maintaining mental well-being.
  7. Heart Health: Vitamin D may have a protective effect on the cardiovascular system. Research suggests that sufficient vitamin D levels are associated with a reduced risk of heart disease, hypertension, and stroke.

It’s worth noting that vitamin D can be obtained from sunlight exposure as well as certain foods and supplements. However, individual vitamin D requirements can vary, and it’s advisable to consult with a healthcare professional to determine the appropriate intake and any necessary supplementation based on your specific needs. Also, it is important to know, in your case, can vitamin D deficiency cause hair loss or other underlying health conditions.

Frequently Asked Questions | Can Vitamin D Deficiency Cause Hair Loss

Does hair grow back after vitamin D deficiency?

With proper diet and care, hair always grows back. It may be a slow process but usually, it varies from person to person depending on age, health, and other factors.

Can vitamin D deficiency cause hair loss and alopecia?

Vitamin D deficiency can be one of the factors of hair loss and alopecia. It can be tracked and monitored by getting some labs done and consulting health care professionals.

What are the common signs of vitamin D deficiency?

These are some of the signs you should always watch out for:
Mood swings
Aching muscles and bones
Hair loss
Sweaty head
Weight gain
Difficulty sleeping

Parting Thoughts

In exploring can vitamin D deficiency cause hair loss, your healthcare professional will advise you to run some labs. These simple blood tests will give you a good insight into your overall health. With that information, your healthcare professional will give you a complete plan to work on to gain the vitamin D deficiency back.

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Heidi Lane
Heidi Lane is the lead writer at Dwell HQ. She cannot help herself and continues enrolling in new courses. Being curious and unsatiated comes with its set of adavantages. Her recent obsession is SEO. Besides providing SEO services to businesses, writing, and her day job as an editor for online editorials, she loves to read in spare time. A nomad by heart, enjoying the digital nomad life in various countries. 12 destinations explored, more to go. A foodie at heart, now very hurt with recent life changes that comes with gluten allergy.