We have now been using VeganZyme for a year for my 12 year old daughter who has a rare metabolic condition called Congenital Sucrase-Isomaltase Deficiency (CSID)which means her digestive system doesn't produce the enzymes to break down Sucrose and Starch. She takes one capsule with every starch containing meal meaning she can have a portion of starch just like everybody else. Without it she becomes bloated, very gassy, very irritable and lethargic. If she forgets to take one you can hear the gas building up within an hour. VeganZyme has really improved her ability to digest foods, the Invertase isn't high enough to allow her to eat much in the way of sugars still but by helping digest the starch it means she can eat a substantial and satisfying meal. We noticed an improvement within a couple of days of starting the capsules.