Ribose is a naturally occurring sugar and is thought to help support the recovery of ATP (Adenosine triphosphate); the primary energy carrying molecule. ATP levels are thought to drop after a strenuous workout.D-Ribose may be partcicularly useful for athletes who are exercising extensively and depleting energy reserves.. Take two to six capsules daily, preferably with meals. Do not exceed stated dose. Getting the proper nutrition before your workout can prove the difference between a positive and mediocre session. Before putting your body through it's paces, make sure to get the carbohydrates and other nutrients your body needs. Holland & Barrett stock a wide range of pre workout products for you to discover. Click through to individual products to find the flavours and ingredients right for you.