Our supplements are based on whole, organic, dried and blended mushrooms and are the result of extensive scientific research by Marvin Hausman, MD., and his distinguished team of scientists at Penn State University. D is for DOGS is a breakthrough in whole food nutritional support for dogs because it takes a holistic approach to canine nutrition. Used as a daily supplement, Healthy Gums can keep your dogs mouth healthy and its gums soft and pink. Healthy Gums with vitamin D2 also helps dogs with gums that are bleeding or receding. Scientifically formulated from the finest organic mushrooms, Healthy Gums provides your pet with powerful and natural antioxidants necessary for good oral heath.