Most captive reptiles require a vitamin supplement for continued good health. Many natural food items (crickets ; meal worms etc) are vitamin deficient that may lead to health problems in captive animals. Spot on Vitamins work by using absorption enhancers to drive the vitamins through the skin of the animal. The absorption technology allows a slow delivery of vitamins without the problems of interactions within the gut. Vitamin requirements will vary with the type of animal and the diet provided. Directions: Herpavite should be used once weekly in non hibernating snakes and twice weekly in active lizards and skinks. Herpavite is not suitable for amphibians.