Health Reach D-Mannose 60 Capsules contains 500mg of pharmacy grade D-Mannose per capsule. D-mannose is used to prevent UTIs and Cystitis symptoms. D-Mannose is a simple sugar found in cranberries. The amount of D-mannose in a cranberry supplement is not as high as a pure D-mannose supplement. Pure D-Mannose powder has up to 50 times more D-Mannose than Cranberry.