Vitamin D is a fat soluble essential vitamin, created from cholesterol by the exposure of our skin to UV rays in sunlight. It's also found in fish eggs and dairy products. Vitamin D helps to control the amount of calcium and phosphate in the body, which is important for proper development and function of teeth and bones. It also plays an important role in hormonal signalling, as well as potentially increasing testosterone in men.
Anyone working indoors or living more northerly than 37 degrees of the equator is likely to have sub-optimal levels of vitamin D as there isn't enough sunlight at these latitudes.
We've crammed 5000iu in each gelatin capsule, take 1 a day and shake away those winter blues.