As you may have already heard, Calcium is the most important ingredient in bone and joint formation. Hence, Calcium must be part of one's diet. Calcium intake must be supplemented with Vitamin D, so as to absorb the Calcium into the body. Deficiency in Calcium intake can lead to rheumatoid arthritis or osteoarthritis. So what is the best source of Calcium? One must keep in mind that the human body needs different levels of Calcium at different ages. Also, bone density increases then decreases with age. Hence, it is important to know the facts about Calcium and its role in Arthritis.