The product is an ultrafine powder supplement by Rep-Cal specifically designed for reptiles to support calcium levels in their diet. The powder contains calcium carbonate as the main active ingredient, with an added bonus of Vitamins D3 for optimal calcium absorption. This phosphorus-free formula ensures a pure source of calcium without any potential negative effects on reptile health. The convenient powder form makes it easy to incorporate into a pet's diet, providing a non-GMO option for pet owners looking to enhance their reptile's wellbeing.