Sometimes this behavior goes away as the pup gets older and sometimes it becomes a habit. All of my pups have done it at some point and they have all grown out of it.
We've tried the product and it only worked for one of our dogs. What else you can do... right after they poop, immediately praise then distract them with a ball or other toy. Or if they are on a leash, start while praising them, start walking away to keep them from going back and eating it.
If you see Maddy eating her feces, tell her firmly NO and then praise if she leaves it alone.
I would try the pill and the distracting behavior if I were you. Good luck!