AS Edexcel BiologyWatch
3. Vitamin C is water soluble and cannot be stored within the body. Many mammals, including dogs, can make vitamin C in certain cells. Humans cannot synthesize vitamin C and have to obtain it from their diet. However, if they consume more than needed, the excess is filtered from the blood in the kidneys and passes out in the urine.
Imagine that you are a scientist in a physiology research lab. Outline the design of an investigation to determine whether taking vitamin C supplements benefits people.