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Related Concept Videos

Role of Skin in Vitamin D Synthesis01:23

Role of Skin in Vitamin D Synthesis

The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
Vitamins01:30

Vitamins

Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...
Connective Tissue Cell Types01:22

Connective Tissue Cell Types

Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Immunodeficiency Diseases01:25

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...

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Related Experiment Video

Updated: Jun 5, 2026

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
10:46

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data

Published on: December 9, 2015

Vitamin D insufficiency.

Tom D Thacher1, Bart L Clarke

  • 1Department of Family Medicine, Mayo Clinic, Rochester, MN 55905, USA. thacher.thomas@mayo.edu

Mayo Clinic Proceedings
|January 4, 2011
PubMed
Summary
This summary is machine-generated.

Vitamin D supplementation in adults helps reduce fracture and fall risks. However, evidence for other health benefits, like preventing chronic diseases, is mainly from observational studies, requiring more clinical trials for confirmation.

Related Experiment Videos

Last Updated: Jun 5, 2026

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
10:46

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data

Published on: December 9, 2015

Area of Science:

  • Endocrinology
  • Nutritional Science
  • Public Health

Background:

  • Vitamin D deficiency classically causes bone disease (rickets, osteomalacia) due to impaired mineralization.
  • Vitamin D insufficiency is linked to low serum 25-hydroxyvitamin D and potential non-skeletal health issues.
  • Defining vitamin D status is complex due to individual variability and calcium intake interactions.

Purpose of the Study:

  • To review the evidence for vitamin D's effects on skeletal and non-skeletal health outcomes.
  • To identify studies with the strongest evidence for clinical decision-making regarding vitamin D.
  • To assess the current evidence for vitamin D's role in conditions beyond bone health.

Main Methods:

  • Literature review of personal libraries and PubMed search.
  • Search terms included "vitamin D" combined with non-skeletal health outcomes (e.g., mortality, cardiovascular, diabetes, cancer, multiple sclerosis, allergy, asthma, infection, depression, pain).
  • Selection focused on studies with the highest level of evidence.

Main Results:

  • Vitamin D supplementation in adults is proven to reduce fracture and fall risks.
  • Evidence for other health benefits (non-skeletal) is largely derived from observational studies.
  • Controlled clinical trials are needed to conclusively demonstrate non-skeletal benefits.

Conclusions:

  • Vitamin D plays a clear role in preventing fractures and falls in adults.
  • The broader health benefits of vitamin D require further investigation through rigorous clinical trials.
  • Current evidence suggests caution in attributing non-skeletal health improvements solely to vitamin D based on observational data.