DOES VITAMIN D DEFICIENCY CAUSE HAIR LOSS?
Vitamin D (also known as calciferol) is a fat soluble vitamin produced endogenously in the skin from ultraviolet rays from the sun, it is also present in certain foods. Vitamin D obtained from food and exposure to the sun just undergo a series of changes (hydroxylations) in the body for it to become active. The first change occurs in the liver, here vitamin D is converted to 25-hydroxyvitamin D (also known as calcidiol). The second change occurs in the kidneys, at this point vitamin D is converted into the physiologically active 1,25-dihydroxyvitamin D (also known as calcitrol).
Vitamin D promotes the absorption of calcium in the gut and maintains bone health. Without vitamin D bones can become misshapen and lead to a condition known as rickets.
Vitamin D is also involved in cell growth, the reduction of inflammation, glucose metabolism and immune function. Vitamin D levels are generally tightly regulated and deficiency will only occur when the need for vitamin D is outweighed by intake.
Vitamin D is associated with hair loss at levels below 75 mol/L (30 ng/mL).