This is a Reptile Calcium Powder + D3 – 500g (Reptile One). Reptile One’s calcium powder + D3 is carefully formulated for use in supplementing your amphibian or reptile’s diet. Vitamin D is essential for captive amphibian or reptiles that may not be receiving sufficient natural sunlight or UVB. Calcium is essential in promoting healthy bone growth, nerve function, hormone synthesis and for healthy egg production in breeding females. It can also help prevent MBD (Metabolic Bone Disease), especially in young reptiles as they grow. Calcium supplements help restore the minerals that a reptile would normally receive through a varied diet in the wild. You can ensure that your reptiles receive the calcium they need by dusting feeder insects and/or vegetables.