@burcinc-- No, diabetics don't automatically develop glutathione deficiency. This is a very, very rare disorder. Less than 100 people worldwide have it. And it's inherited. So the likelihood that you have it is very low. Of course, a doctor will give you the best advice on this but being a diabetic doesn't mean that you will have it.
People experiencing symptoms associated with this should probably suspect other conditions with the same symptoms first.