Property Vitamin D3 Contributes To: • The Maintenance Of Healthy Bones And Teeth. • Normal Function Of The Immune System. • Normal Absorption And Utilisation Of Calcium And Phosphorus. • The Maintenance Of Normal Muscle Function. Synergies Vitamin D3 Is The Most Active Vitamin D As It Does Not Require Any Transformation. Our Body Usually Gets Vitamin D3 From Sun Exposure And Foods. A Lack Of Vitamin D3 Causes Excessive Tiredness, Cognitive And Mood Disorders And Heart Diseases.