Herbal Wormer for Horses Is A Natural Alternative to Chemical Wormers Herbs have been used for hundreds of years as a natural way to control internal worms without causing harmful side effects. We use a special blend of herbs that not only control parasite infection but supports the immune system to improve overall health.Herba-Worm Naturally is an herbal horse wormer that rids the body of worms by supporting the body in expelling parasites. That way the worms can't build up a resistance like they do with conventional horse wormers.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. Available: 60,120 & 240 Servings (approx.)Directions: Use daily for 10 days every other month to break the cycle of re-infestation and keep your horse healthy and de-wormed. Most effective if used around the full moon when the adult worms are shedding.2 scoops per day for 10 days, for 1000-1200 lb horse (scoop provided)1-Scoop = 1-Serving (Scoop included is 1 tablespoon)