RUKU Bars are energy bars formulated for precise canine energy replenishment. RYŌKEN INSTINCT believes in an organic diet as close to what our dog ancestors thrived on. We use only whole whole food ingredients and absolutely NO preservatives. RUKU BARS are made of a meat and organ based blend supplemented with canine superfoods for added nutritional benefit. Each recipe was thoughtfully crafted following the guidelines set by AAFCO and is USDA certified.