Hi and welcome to the forums.
I hadn't heard of Sugar Defender. Google took me to a site where it's on sale for $50 a bottle (this is a discounted price, it's normally $69). The page makes lots of claims - and it also says:
All content and information found on this page are for informational purposes only and are not intended to diagnose, treat, cure or prevent any disease. The FDA hasn't evaluated the statements provided on this page. Make sure you consult with a licensed doctor before taking any supplement or making any changes to your diet or exercise plan. Individual results may vary.
I also noted it carries the logos of YaleNews, the American Diabetic Association, Newcastle University, and the National Library of Medicine - in small print underneath it says:
The company is not endorsed by, sponsored by, or affiliated with any of these organizations
So...on that basis, I wouldn't be buying it.
[Edited for politeness]