Oxyform D3 2000 IU Immunity 90 Capsules is a food supplement formulated with vitamin D3, which promotes the mineralization of bones and teeth.Vitamin D3, or cholecalciferol, is produced naturally by the skin through the action of ultraviolet B rays. Vitamin D3 is essential for calcium and phosphorus metabolism. The bioavailability of vitamin D3 is optimized in this food supplement thanks to the use of extra virgin olive oil.gluten, preservative and titanium dioxide free.food supplements should never replace a healthy, diversified and balanced diet and a healthy lifestyle.