How old a kitten are you talking about. I think that might make a difference. If under 8 weeks, not sure there is anything. Are you seeing evidence of worms, or is this precautionary? If precautionary, I know you can feed food grade diatomaceous earth
Dosing for Dogs and Cats
Because food-grade DE is not a toxic agent, it is very safe to use in the recommend dosage for worming pets, even very young puppies and kittens. The following can be given once or twice daily: