Henry Blooms Vitamin D3 promotes Calcium absorption which is essential for building and maintaining healthy bones. Vitamin D deficiency is common in Australia, particularly in the age group where osteoporosis is a risk. Vitamin D assists with the absorption of Calcium. Stronger muscles and bones can help reduce the risk of falls in the elderly and reduce fractures. Vitamin D3 is the most absorbable form of Vitamin D. Tips: Vitamin D3 is more effective in raising blood levels of Vitamin D than Vitamin D2. Vitamin D3 increases absorption of Calcium whereas Vitamin D2 does not. Vitamin D3 binds to plasma proteins and isn't excreted as easily from the body. Vitamin D3 in its natural oily form.