Rep Cal Herptivite is a supplement that we offer to tortoises to fill the gaps that their diet may be lacking, much like a human would take a multivitamin.
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. In general, we offer this to most tortoises no more than once a week. It can be dangerous if over used, so care should be taken. Check with the source of your tortoise for a supplementation schedule if you don't know how much to offer your tortoise.