Hi again Robbie,
This is not a supplement that is recommended for diabetics, nor do the makers claim that it will help a diabetic. Chromium is believed to play some part in increasing insulin production, although the research into this is very patchy and nothing has been conclusively proved. Your body only needs trace elements of chromium so if your normal diet includes some beef, liver, eggs, chicken, oysters, green peppers, apples, bananas or spinach, then you are getting all the chromium your body needs. If you buy the tablets then it is a 99.9% certainty that you will just be throwing your money away. In fact, as you body will simply excrete any chromium over and above what it needs, you will literally be flushing your money down the pan!
Whey protein on the other hand has been proved to be of help to diabetics, but only if used in the correct way and at the correct time. Whey digests very rapidly, allowing it's amino acids to get into the blood stream faster than other protein sources. This is beneficial in the post work-out "anabolic window" (0-45 minutes after training or competition) because the muscle tissue at that point is most receptive to insulin and nutrients in the blood. It is often used by athletes to fine-tune their metabolisms, but is not something that you should tinker with without expert advice.
I see that your profile says you are "diet controlled". Have you actually changed your diet in any way since diagnosis, or are you doing what probably most of us have done in the past and looking for a magic potion that will do it for you? Believe me - there is not such thing as a easy fix for diabetes. If controlling it was as simple as taking a vitamin supplement, why do you think all the drugs companies make billions out of diabetes medicines!!