K9 Young at Heart is a longevity and anti-aging dog supplement.Scientists have begun to unlock the biological basis of aging, and arrived at natural nutrition strategies to help halt, or perhaps even reverse key aspects of aging. Using these discoveries with the goal of returning your dog's metabolism to what it was in its prime. But Young at Heart is not just about helping dogs live longer, it's about living better. Contains nutrients demonstrated in major medical studies to strengthen the biochemical links leading to a better quality of life for older animals. K9 Young at Heart has the highest human grade ingredients. Reverses muscle loss, boosts metabolism, strengthens joints and resistance. Hydrates older canine bodies, optimizing cellular water balance. Enhanced digestion and absorption with partially predigested calories and pre and probiotics.