Pretty much. Ingredients are given in the most used to least used order, but my experience with the ingredients also contributed. I only had some dried pumpkin seeds so that was that. Garlic is a known vermifuge so there is a lot in there. Slippery elm bark is like a bandaid for the human intestinal system and I would guess chickens and other animals. It has a beneficial effect on intestinal linings in most animals. So my guess is that it's in there to make the environment less interesting to parasites as it creates a stronger lining. Thyme and mint oils (within the plant - you don't use actual oils) are vermifuges as is DE. But I used very little DE because, although it is used as a pet wormer, if it's sprinkled, it can get in the air and inhalation is not good for the lungs. It tears up lung tissue. So sometimes I add a little extra of just DE separately and wet the food down slightly. I just use it periodically for some extra help to the system. I don't think anyone should be eating a lot of wormer whether natural or not.