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Glossary Vitamin D Metabolism

process converting vitamin D into its active, calcium-regulating form

Vitamin D metabolism refers to the process by which the body converts vitamin D from sunlight or dietary sources into its active form, which is crucial for calcium absorption and bone health. This involves two main steps: first, vitamin D is converted to calcidiol in the liver, and then to calcitriol in the kidneys, which is the biologically active form that helps regulate calcium and phosphate levels in the blood.

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Research

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research Vitamin D metabolism and function in the skin

185 citations , June 2011 in “Molecular and cellular endocrinology”

This review discusses the regulation and function of vitamin D and its receptor in skin cells, highlighting their roles in processes such as proliferation inhibition, differentiation, and innate immunity, but reports no new results.

research Rickets with alopecia: An inborn error of vitaminD metabolism

170 citations , May 1979 in “The journal of pediatrics/The Journal of pediatrics”

This report describes two sisters with rickets and alopecia unresponsive to high doses of vitamin D2, where oral phosphorus supplements led to significant clinical improvement.

research Vitamin D, Lipid Metabolism and Prostate Cancer

1 citations , January 2009 in “Trepo - Institutional Repository of Tampere University”

This study found that vitamin D regulates cholesterol metabolism and may influence prostate cancer development through mechanisms affecting prostate cell growth and sex hormone metabolism.

research Dietary Vitamin D Supplementation Improves Hair Follicle Development and Affects Fatty Acid Metabolism in Rex Rabbits

July 2025 in “Food Science & Nutrition”

This study found that vitamin D supplementation in diets of Rex rabbits improved hair follicle development and fatty acid metabolism, with 1400–2100 IU/kg proving most effective for hair density and 2800 IU/kg increasing hair length.

research Chapter 28. Vitamin D: Production, Metabolism, Mechanism of Action, and Clinical Requirements

20 citations , November 2008

This chapter discusses the production, metabolism, and mechanism of action of Vitamin D, including its role in calcium and phosphate metabolism and its function in the epidermis and hair follicles, without presenting new research findings.

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Community Join

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community Does vitamin D deficiency actually cause hair loss? Has anyone actually grew back hair after fixing vitamin d levels?

in Chat 65 upvotes 1 year ago

Vitamin D deficiency can contribute to hair loss, but it is not the sole cause, and supplementation may not always resolve the issue. Treatments like finasteride and minoxidil are recommended for hair regrowth, with vitamin D and other supplements providing additional support.

community Please take a vitamin & hormone test

255 upvotes 1 year ago

Checking vitamin and hormone levels is important for addressing hair loss, as deficiencies in vitamin D, zinc, and iron can affect hair growth. Treatments like finasteride, minoxidil, and vitamin supplements are used, but addressing deficiencies is crucial for effectiveness.

community Before you spend another dollar on treatments please check your ferritin and thyroid

205 upvotes 2 months ago

Check ferritin, thyroid, and vitamin D levels before spending on hair loss treatments. Addressing deficiencies can slow hair shedding and save money.

community Could male-pattern baldness have a secondary photobiological function? The Solar Window Hypothesis

11 upvotes 3 weeks ago

Male-pattern baldness might increase UVB exposure on the scalp, potentially affecting vitamin D and skeletal health. The hypothesis is debated, with some seeing it as a minor benefit in specific contexts.

community Anyone have experience with natural DHT blockers?

7 upvotes 2 years ago

The conversation is about using natural DHT blockers like pumpkin seed oil and saw palmetto extract for hair loss. The user has been using minoxidil, derma rolling, vitamin D, and biotin but is considering finasteride next.

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Learn

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learn Vitamin D

vitamin you should probably be taking for general health might also help your hair a little

What is the connection between Vitamin D and hair loss? Vitamin D deficiency may contribute to hair loss by disrupting hair follicle regulation.
Can Vitamin D deficiency trigger excessive hair shedding? Yes, vitamin D deficiency can trigger excessive hair shedding.
Is it safe to take Vitamin D supplements for hair growth? Vitamin D supplements are generally safe but may not significantly improve hair growth.
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learn Overview

learn Calcium D oantothenate

learn Dexpanthenol

precursor of vitamin B5 with hair stimulating effects

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Clinics

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Hair Loss Treatments
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