How Can I Deworm My Cat Naturally? Herba-Worm Naturally for cats & dogs is a natural alternative to chemical dewormers. Herba-Worm Naturally is an herbal cat dewormer that helps rid your feline's body of worms by promoting an environment that is repelling to parasites.A natural cat wormer helpful in supporting the body in defending itself rather than relying on just poisoning the worms. Worms don’t build up a resistance like they do with conventional cat de wormers.Sometimes cats can be finicky. Starting with just a very small amount added to wet food is the best approach. Once they acclimate, increase the amount slowly until you reach the recommended dosage. Our 30 return policy can be found here.Q- What is the difference in Herba Worm Naturally and Worm Free Naturally dewormers?A- Herba Worm Naturally is used for de-worming but not prevention. Herba Worm is an herbal based wormer you use 10 days.Worm Free Naturally is de-worming and prevention. WFN is a Diatomaceous Earth based wormer you use for 90 days but then it can also be used 3 x week for prevention. 8 oz jar- 80 small servings (approx)