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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 Vitamin A Metabolism During Refractory Telogen

May 2020 in “Current developments in nutrition”

This study suggests that retinoic acid synthesis and signaling may play a role in maintaining refractory telogen, potentially inhibiting the hair cycle in mice fed varying levels of vitamin A.

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Learn

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learn Vitamin B6

How does Vitamin B6 support healthy hair growth? Vitamin B6 is essential for amino acid metabolism, supporting normal hair growth.

learn vitamin b2

How does Vitamin B2 support scalp circulation and cellular energy production? Vitamin B2 enhances scalp circulation and energy production by supporting cellular metabolism.

learn Vitamin D

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

learn Biotin

supplement to help with hair texture and quality

Vitamin B7: is it the ultimate secret to healthy hair or just a myth? Biotin is important for hair health, but supplementation is often unnecessary for most people.

learn Overview

learn Neem Oil

natural substance from Neem tree with medicinal and pesticidal properties

learn Vitamin C

Is your itchy scalp a sign that it’s missing vitamin C? Find out how it may help with patchy hair loss. An itchy scalp may indicate a vitamin C deficiency affecting hair health.

learn vitamin A

Are you unknowingly overdoing vitamin A? It could be speeding up hair loss linked to hormones like DHT. Sustained vitamin A intake above the tolerable upper limit (3,000 mcg/day of retinol for adults) is linked in case reports to diffuse hair shedding; the claim that it amplifies DHT-driven hair loss has no published human evidence behind it.

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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 Study: There is 70x Higher Unconjugated DHT in Feces Compared To Blood Levels in Young Adults - Gut Microbiota Manages DHT Recycling and Metabolism

in Research/Science 194 upvotes 1 year ago

Gut microbiota significantly influences androgen metabolism, impacting hair loss treatments like finasteride. Probiotics, dietary changes, and fecal microbiota transplants may help manage DHT levels and improve hair health.

community Update about Hair Follicle Glucose Metabolism: New Clinical Data Collection with Ex-President Of American Board Of Hair Restoration Surgery.

39 upvotes 2 years ago

David Barreto shared that a London-based research group is conducting a 12-month trial for a new nutraceutical treatment for pattern hair loss, designed with Dr. Carlos Puig. The trial aims to provide robust data, with results expected in 1-2 years, potentially representing a significant advancement since finasteride’s introduction in 1997.

community Can low level of vitamins cause hair loss?

21 upvotes 2 years ago

The conversation is about whether low vitamin levels can cause hair loss. The consensus is that the user's vitamin levels are normal and unlikely to affect hair loss or the effectiveness of finasteride and minoxidil treatments.

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