Taurine is one supplement recommended by some doctors for diabetics. Dr. Jensen, MD, recommends this in her book.
http://obesitysanswer.com/

Taurine has a value for older patients who can no longer make it for themselves:

http://en.wikipedia.org/wiki/Taurine

This monograph is very good:
http://www.webmd.com/vitamins-supple...ntName=TAURINE

I really think for our purposes here, 1 to 2 grams a day is probably enough.

Taurine is inexpensive and has no side effects to speak of.
It is something to think about here, if you are older, have glucose control problems, or are very overweight. Taurine is very helpful for sluggish gall bladder issues, and I've used it myself for that. I also supplement my cats, when they have
human food/or tuna because cats cannot make their own taurine.

There is a product called magnesium taurate...by Cardiovascular Research. It supplies both magnesium and taurine, and is used by
cardiac patients, and some Tourette's patients.

http://www.magnesiumtaurate.net/
It used to be more expensive, and difficult to find. But both of those issues have changed. It is one option some readers here might
consider.