Zesty Paws Healthy Aging NAD+ Precursor Cellular Energy, Brain & Heart Supplement is a fantastic supplement that supports your dog as she ages. This powder is specially formulated with Niagen (Nicotinamide Riboside Chloride) that helps support your pet’s cellular, metabolic, heart, brain, and skeletal muscle health. Keep your pet feeling zesty with this premium supplement that is easy to mix and serve and will bring back memories of her puppy days.