Hi Elizabeth @ess77 you have provided great information for the importance of having balanced nutrition. Proper nutrition does have an impact on health. You must not have the intrinsic factor in your digestive system to be giving yourself a subcutaneous injection of vitamin B12. I have known people who were not able to get B12 orally i.e. through foods or vitamins because of this issue. People do need to look at their diets for any deficiencies and be careful in taking supplements because some are water soluble, which do not store in the body, and others, such as vitamins A, D, E, and K, are fat soluble meaning the body stores them in the fat. Anyone in question should get the advice of their PCP for help.