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GlossaryVitamin D (ergocalciferol)

fat-soluble vitamin essential for calcium absorption and bone health

Vitamin D is a fat-soluble vitamin that is crucial for maintaining healthy bones and teeth by aiding in the absorption of calcium and phosphorus from the gut. It can be obtained through exposure to sunlight, certain foods, and supplements. There are two main forms: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol), with D3 being more effective at raising blood levels of the vitamin. Deficiency in vitamin D can lead to conditions such as rickets in children and osteomalacia in adults.

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research The Importance of Vitamin D and Its Effects on the Human Body

April 2025

Vitamin D3 is crucial for health, preventing issues like bone disorders and hair loss.

research Vitamin D and the Skin: Focus on a Complex Relationship

139 citations , February 2014 in “Journal of Advanced Research”

Vitamin D is important for skin health and may affect conditions like psoriasis and hair loss, but more research is needed to understand its role fully.

research Extraskeletal Actions of Vitamin D

119 citations , July 2016 in “Annals of the New York Academy of Sciences”

Vitamin D has potential benefits for cancer prevention, heart health, diabetes, obesity, muscle function, skin health, and immune function, but clinical results are mixed and more research is needed.

research Oral Manifestations of Hematologic and Nutritional Diseases

50 citations , November 2010 in “Otolaryngologic Clinics of North America”

Recognizing oral symptoms can help diagnose and treat blood and nutritional diseases early.

research Polycystic Ovary Syndrome and Other Androgen Excess-Related Conditions: Can Changes in Dietary Intake Make a Difference?

48 citations , February 2008 in “Nutrition in Clinical Practice”

Dietary changes, including weight loss and a balanced diet, are important for managing PCOS, especially in overweight women.

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community Just found out I am Vitamin D deficient

in Treatment 58 upvotes 3 years ago

A user found out they are vitamin D deficient and was prescribed high-dose vitamin D supplements, asking if others had similar experiences and if it improved their hair. Some shared improved mood and testosterone levels after treatment, while another combined vitamin D supplements with finasteride due to family history of baldness.