Yes. You could actually get your little froggies sick from too much vitamins. High amounts of minerals could be toxic. I would recommend dusting twice a week on whatever amount of food you give them a day. It isn't recommended to have a multi and calcium all rolled into one because it might be hard on the little ones digestive system and may not absorb. so. two for just plain calcium and 2 days for just vitamins ( if it is necessary - I heard roaches are very nutritious! but I do not know about roaches specifically so I can't confirm this.)