As a rule, I really dislike taking any "health supplements" because there is no regulation on them. I have no idea what is really in them or the quality of the products or in their efficacy. My doctor recommended a few for me because I eat a vegan diet. One was green tea extract. I've had suspicions about the supplements I've been taking and I decided some time ago that when they run out, I'll not take them any more. The only real loss I've noticed (and my doctor as well) is lower levels of vitamin B and D. I get a booster shot for vitamin B and I'm trying to get a bit of sunshine and am drinking more almond milk for my vitamin D. Otherwise, all of the supplements are leaving my cabinet.
I've done the same with many of the other drugs I'm taking as well. Five years ago, I swept my cabinet and fridge clean of all the drugs I was taking for diabetes. I was in an abusive relationship, didn't realize what was going on, and decided that if I died, I didn't care. I went vegan (because that's all I could afford) and lost lots of weight. My glucose levels started to drop and I decided to starve the diabetes beast of anything it could make sugar out of. Since then, I've lost the abusive spouse, lost over a hundred pounds, and have educated myself on how to eat a balanced vegan diet. I do watch my carb intake and match it with being healthy and maintaining my weight. For the first time in my life, I can buy a size 8 jeans.
I don't encourage anyone with diabetes to do what I did but I do encourage everyone to consider going vegan. At the minimum, watch what you eat. Cut out all the simple carbs and limit the fat and carbs you eat to levels that can maintain your ideal weight.