Doctors Purest MEGA Vitamin D3 2000 IU supplies the key vitamin in a highly-absorbable liquid soft gel form. D3 (also known as cholecalciferol) is a form of vitamin D that the body manufactures when skin is exposed to UV radiation from the sun and it is synthesized through the skin.

Studies show that a significant population has lower levels of D3 and a minimum 1000 IU is recommended for optimal health.

UCLA scientists and the Human BioMolecular Research Institute have found that a form of vitamin D, together with curcumin, may help stimulate the immune system to clear the brain of amyloid beta, which forms the plaques considered the hallmark of Alzheimer's disease.

"We hope that vitamin D3 and curcumin, both naturally occurring nutrients, may offer new preventive and treatment possibilities for Alzheimer's disease," said Dr. Milan Fiala, study author and a researcher at the David Geffen School of Medicine at UCLA and the Veterans Affairs Greater Los Angeles Healthcare System.

Vitamin D3 is an essential nutrient for bone and immune system health. Together with Calcium, Vitamin D3 helps develop strong bones and teeth, and also assists in immune system health. It also plays a part in regulating cellular growth and keeping the nervous and immune system functioning properly. Vitamin D3 deficiency may cause such problems as cardiovascular diseases, diabetes, osteoporosis, depression and gum diseases. All these conditions contribute to dementia. Vitamin D3 is believed to play a role in controlling the immune system (possibly reducing one’s risk of cancer and autoimmune diseases), increasing neuro-muscular function and decreasing falls, improving mood, protecting the brain against toxic chemicals, and potentially reducing pain.

Vitamin D3 is both a vitamin and a hormone. It acts as a vitamin when it binds with calcium for proper absorption. Humans cannot digest calcium without adequate amounts of Vitamin D3.