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learn Vitamin D

Vitamin made in the skin from sunlight, also taken as a supplement

How can I tell if my hair loss is linked to low Vitamin D levels? Hair loss may indicate low Vitamin D levels, but testing is needed for confirmation.
What is the connection between Vitamin D and hair loss? Observational studies link low vitamin D with some types of hair loss, especially alopecia areata, but they have not shown that low vitamin D causes it.
Can Vitamin D deficiency trigger excessive hair shedding? Observational studies link low vitamin D with some kinds of shedding, but they have not shown that it causes it. A blood test and a doctor can check your level.
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learn Biotin

B vitamin, often sold as a hair supplement

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Research

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research Presence of a Deletion Mutation (c.716delA) in the Ligand Binding Domain of the Vitamin D Receptor in an Indian Patient with Vitamin D-Dependent Rickets Type II

18 citations , November 2009 in “Calcified tissue international”

A genetic mutation caused severe rickets and alopecia in an Indian patient, but high-dose calcium and phosphate treatment improved their condition.

research Laboratory Testing in Telogen Effluvium

December 2020 in “Journal of Drugs in Dermatology”

The document concludes that more research is needed to confirm if blood tests for things like iron and vitamin D are helpful for hair loss from Telogen effluvium.

research Expert consensus recommendations on appropriate serological testing for the chief complaint of alopecia

July 2025 in “Journal of Dermatology for Physician Assistants”

This study by a panel of 13 clinicians led to 22 consensus statements recommending approaches for diagnosing scarring and nonscarring alopecias, suggesting scalp biopsy for suspected scarring alopecias and specific serologic tests for nonscarring types like alopecia areata based on clinical presentation.

research Serum vitamin D, ferritin, and TSH in patients with telogen effluvium: a retrospective epidemiological study

January 2022 in “International Journal of Medicine in Developing Countries”

In this study, 35.4% of telogen effluvium patients showed ferritin deficiency and 34.2% had vitamin D deficiency, suggesting these should be included in TE screening; TSH testing should be individualized.

research What are the relevant investigations for hair loss in young women?

October 2025 in “Zenodo (CERN European Organization for Nuclear Research)”

This study outlines that for addressing hair loss in young women, a comprehensive approach including hormonal evaluation, thyroid function, iron and vitamin D testing, along with clinical assessments like pull tests and trichoscopy, is recommended.

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Community Join

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community Malabsorption: Nutrient Testing and Supplementation

2 upvotes 2 years ago

The user is experiencing severe hair loss due to gut malabsorption and is seeking advice on nutrient testing and supplementation. They have low Vitamin D and Ferritin levels and are asking for recommendations on additional nutrients and blood tests to consider.

community Micronutrient testing, deficiencies, etc.

4 upvotes 4 years ago

Micronutrient testing and deficiencies related to hair loss, particularly androgenetic alopecia (AGA). Discussion includes the impact of iron, selenium, zinc, copper, folate, B12, vitamin E, vitamin D, amino acids, and fatty acids, alongside treatments like dutasteride or finasteride.

community People who solved their Vitamin D deficiency, how much did it help with regrowth?

in Treatment 56 upvotes 1 year ago

Vitamin D supplementation can aid hair regrowth for some, but results differ. Combining vitamin D with finasteride and minoxidil often improves hair thickness, though not for everyone.

community Best supplements to compliment finasteride protocol

17 upvotes 2 months ago

The conversation discusses supplementing a finasteride regimen for hair loss with Omega 3, Vitamin D/K, Zinc, probiotics, and possibly adding oral minoxidil, magnesium, astaxanthin, and B vitamins. Users suggest testing nutrient levels before adding supplements like zinc and iron, and consider biotin, keratin, and possibly switching to dutasteride or adding topical minoxidil.

community Son, 19: One year of Fin and Min but not seeing results?

in Finasteride/Dutasteride 21 upvotes 1 year ago

A 19-year-old has been using oral finasteride and minoxidil for a year without noticeable results. Suggestions include adding derma-stamping, increasing ketoconazole shampoo use, and considering vitamin D testing, while acknowledging that response times vary.

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