if your trying to work wild deer you need to get the right amount of wormer and how would you be sure that the deer came to your feed for the 2-4 days that product needed to be consumed? Things like chicory, and some brassicas have worming like properties and if deer were consumming them regularly, the odds of them benefitting deer would be greater. If your in an area where you can place deer mineral, use one with "garlic in it.....yeah, there are a couple other things you can put in your deer mineral that also will help you worm those deer but...garlic is a natural attractant for deer and has worming properties. it also is a natural fly repellent of sorts.
The deer mineral ive formulated the past 20 years has garlic in it and any pelleted/game farm deer feeds that i formulate has garlic in it for the gut health, fly repellent and worming benefits of it......