My veiled is having some shedding issues and I was told vitamin A would help. I thought the thread that I read said to use the 400 iu jelcaps and put a very small drop on one of his feeders. Is this correct on the size of gelcaps? I checked several drug stores and all I could find is 10,000 and 8,000 iu. I don't want to overdose him. Hope you can help. David