The amount of oral vitamin C someone can tolerate depends on the person and their health. Studies indicate that when someone gets an infection, their ability to absorb vitamin C increases. This is because the body uses up a lot more vitamin C when it’s under stress and is an example of how your physiology adapts to meet your body’s needs. This phenomenon of increased vitamin C absorption is often called “to bowel tolerance.” It’s a technique I shared with many of my patients. This blog teaches you how you can use it to improve your health too.