Powdered cuttlefish is a good supplement to use if you're using worms exclusively (or extensively) Any one of the proprietory multi-vitamins manufactured for reptiles will suffice. If you're spoilt for choice, maybe let price guide you and go for an expensive one! Don't overdo things though, you don't need to add supplements to every meal. If you can get your snakes onto pinkies the only supplement you need to use is the cuttlefish.