Rep Cal calcium supplement is a supplement that we offer to tortoises that are being kept outdoors, with access to natural sunlight. Tortoises maintained indoors should be offered the Rep Cal calcium supplement with D3. 

This product is a ultra fine powder that should be dusted on their diets, and consumed with their foods. Quantity will vary depending on species, size, age and their situation (adult females producing eggs require more than adult males, for example). Check with the source of your tortoise for a supplementation schedule if you don't know how much to use.