Rickets is a childhood disease of softening of weakening bones (mayoclinic). In 1914 As a plan to find the cure for Rickets, Dr Mellanby fed cod liver oil to dogs and discovered that the dogs did not develop Rickets and the ones that had Rickets were treated. Because of such results, it was concluded that Vitamin A was the cause of the disease prevention. Then in 1922 Dr. Elmer McCollum synthesized cod liver oil to where Vitamin A was removed. The oil still continued to cure the dogs and it was concluded that a different substance was the that cause of a cure for Rickets. That substance was later named Vitamin D
Rickets is a childhood disease of softening of weakening bones (mayoclinic). In 1914 As a plan to find the cure for Rickets, Dr Mellanby fed cod liver oil to dogs and discovered that the dogs did not develop Rickets and the ones that had Rickets were treated. Because of such results, it was concluded that Vitamin A was the cause of the disease prevention. Then in 1922 Dr. Elmer McCollum synthesized cod liver oil to where Vitamin A was removed. The oil still continued to cure the dogs and it was concluded that a different substance was the that cause of a cure for Rickets. That substance was later named Vitamin D