Which Vitamin Deficiency Causes Hair Loss? Causes and Symptoms

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Vitamin deficiency hair fall is quite common, leading to a disrupted hair growth cycle and other problems such as thinning, brittle strands, and excessive hair fall. You need to consult a doctor and undergo tests to understand which vitamin deficiency is causing hair fall. 

However, there are distinct signs of vitamin deficiency that lead to hair fall. Once you identify the causes, the process can be reversed through targeted treatment plans. 

Is There a Connection Between Vitamin Deficiency and Hair Fall

Yes. According to many studies, there is a clear connection between hair fall and vitamin and mineral deficiencies, particularly hair thinning and excessive hair fall. Here are a few things that major findings suggest while linking hair fall to vitamin deficiencies:

• People who have low levels of vitamin D, B12, and other micronutrients often have issues like thinning hair and alopecia. 

• Clinical trials show that replenishing deficient vitamin levels significantly improves hair density, reduces hair fall, and improves other markers of hair health and growth. 

• Biochemical studies outline how vitamin deficiencies disrupt healthy hair follicle function, hair protein production, and hair development. 

• An estimated 70% to 90% of Indians suffer from Vitamin D deficiency, making it one of the leading dietary triggers for diffuse hair fall in the region.

Note: Some vitamin deficiency-related hair fall is more common in men than in women and vice versa. 

What Are The Causes of Vitamin and Nutrient Deficiency for Hair Fall

The main causes of vitamin and nutrient deficiency for hair fall include poor diet, surgeries, gut disease, alcohol overuse, specific medicines, etc. In most cases, either the body does not receive sufficient essential vitamins and minerals or cannot absorb them. 

To help you understand why these gaps occur, the following factors summarise the primary causes of nutrient-related hair thinning:

• Vitamin deficiency can result from a vitamin-deficient diet.

• The body might not be able to absorb vitamins properly due to many digestive issues such as inflammatory bowel disease, pancreatic diseases, and celiac disease. 

• People with pernicious anaemia cannot absorb the vitamin B12 their bodies require. This leads to a vitamin B12 deficiency in the body. 

• Alcohol consumption and smoking can have negative effects on how the body absorbs and uses vitamins. 

• In particular phases of life, the body needs more vitamins than usual. Not getting the required amount may result in a deficiency. 

Which Vitamin Deficiency Causes Hair Fall & Their Symptoms

Deficiency of vitamin D, vitamin B7, vitamin B12, vitamin A, E, and C can cause hair fall. These vitamins have an important role in the normal hair follicle cycle and are responsible for the growth of new hair. 

The list below details specific vitamin deficiencies, their primary symptoms, and their direct impact on hair follicle health:

Vitamin D

• Essential for hair follicle health, its deficiency causes weaker, thinner hair and increased hair fall.

• Low levels lead to dry, brittle hair strands and can contribute to premature greying.

Vitamin B7 (Biotin)

• Known as the essential hair vitamin, it maintains healthy follicles and promotes strong hair growth.

• A deficiency results in weak, fragile, and thinning hair prone to shedding.

Vitamin B12

• Plays a crucial role in hair development, with low levels impairing growth and causing overall thinning or patchy hair.

• Deficiency increases hair fall and can also trigger premature greying.

Vitamin A

• Supports the growth and development of hair follicles to maintain strand strength.

• Lack of Vitamin A makes follicles frail and brittle while causing a dry, flaky scalp that accelerates hair fall.

Vitamin E

• Rich in antioxidants that protect hair follicles from damage and support healthy growth.

• Deficiency leads to excessive hair fall, thinning, split ends, and dry, breakage-prone strands.

Vitamin C (Ascorbic Acid)

• Protects hair from oxidative damage, keeps the scalp hydrated, and promotes growth.

• Deficiency results in weak, brittle hair, a dry scalp prone to dandruff, and increased hair fall.

Iron

• Essential for producing hemoglobin, which delivers oxygen to hair follicles.

• Iron deficiency (anemia) is one of the most common causes of diffuse hair thinning, especially in women.

Zinc

• Vital for hair tissue growth, cell repair, and normal functioning of oil glands around follicles.

• Low levels lead to hair thinning, structural damage, and increased shedding.

Selenium

• Acts as an antioxidant to protect follicles from oxidative stress.

• Note: Both a deficiency AND an excess of selenium can trigger hair fall.

How to Fix Deficiency of Vitamins for Hair Fall

To fix the problem of deficiency of vitamins for hair fall, identify the type of vitamin you are deficient in. Once detected, make necessary dietary changes and take doctor-recommended supplements. 

If you want to safely correct vitamin deficiency hair fall and restore strand vitality, consider these practical steps:

Diet changes

Make required modifications to the diet. Include food items in the diet that are rich sources of vitamins. Apart from vitamins, ensure that the diet has the right combination of minerals and proteins as well to promote healthy hair growth. Items such as spinach, salmon, lentils, and walnuts are good options. 

Refrain from crash diets

If you are following weight loss diets, there is a chance that your body might be deprived of essential nutrients, including vitamins. This can cause faster hair fall and slow hair growth. Choose slow, steady diet plans for the right balance. 

Take dietary supplements

If the nutritional deficiency is severe and diet changes are not helping much, it is recommended to take vitamin supplements. Supplements come in different forms, such as tablets, capsules, and even liquids. Consult a healthcare professional before including the supplements in your routine. 

Caution: Excessive vitamin intake can worsen hair fall. 

Find the root cause of the deficiency

In case there is an underlying root cause for the vitamin deficiency, locate that first. Treating the condition might help you recover from hair fall due to deficiency. 

Get regular blood tests

Before starting any supplement, get a standard blood panel to measure your exact Vitamin D, Vitamin B12, and Ferritin (Iron) levels. Supplementing without a confirmed deficiency offers no benefits and can be counterproductive.

Minimise harsh styling & chemicals

Hair weakened by nutritional deficiencies breaks much faster. Avoid excessive heat styling, tight hairstyles, and aggressive chemical treatments while restoring your internal nutrient levels.

Worried about hair fall due to deficiency of vitamins?

Take Traya’s Free Hair Test to know which vitamin deficiency is causing hair fall. 

FAQs

1. Does hair grow back after vitamin deficiency?

Yes, if hair fall is caused by a vitamin deficiency, it is usually reversible. This happens when the nutrient levels are restored. Sometimes people might need to take vitamin supplements under medical guidance for effective results. 

2. Can vitamin D stop hair fall?

Vitamin D can stop hair fall only if the reason for the hair fall is vitamin D deficiency. Restoring the vitamin D levels restarts the hair growth cycle. However, if the hair fall problem is due to hormones, genetics, or other medical issues, vitamin D cannot stop it. 

3. Which vitamin deficiency causes hair fall?

Several vitamin deficiencies, such as Vitamin D, Vitamin B12, Vitamin B7, Vitamin A, Vitamin E and Vitamin C, cause hair fall. Deficiencies in minerals such as iron and zinc can also cause excessive hair fall. 

4. Can hair grow back after vitamin deficiency?

Yes. Hair loss caused by a nutrient deficiency can be reversible if you correct the underlying deficiency through targeted diet or doctor-recommended supplements. 

References:

Fisher J. (2024). Vitamins, Minerals, and Hair Loss: Is There a Connection? Harvard Health Publishing. DOI: Not available (online article)

Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. (2018). The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatology and Therapy. DOI: 10.1007/s13555-018-0278-6

International Centre for Cosmetic Medicine (ICCM). (2023). Which Vitamin Deficiency Causes Hair Loss? ICCM Blog. DOI: Not available (online article)

Cherney K. (2024). Thinning Hair: Causes, Treatment, Vitamins, and More. Healthline. DOI: Not available (online article)