What Are Dog Supplements and How Do They Work? PetMD Dogs are glyphosate sponges, and this time of year it's hard to avoid chemical exposure, it's everywhere. They walk barefoot, roll in grass, lick their furand rarely shower off environmental contaminants. Inside Glutathione the king of antioxidants Animal Wellness Magazine Glutathione, Cysteine & C, 100 vegetarian capsules Life Extension