Hi Jenkal, welcome to the forum 🙂 I hope that the results of your test show that you are not diabetic. Whether it does or not, it is still worth following the principles of a diet suitable for people with diabetes, since this is a diet which is actually healthy for everyone!
I'm not sure why your friend says not to use the circulation booster, did they give a reason? I would suggest having a word with her GP to see if they can think of any reason she shouldn't use it. Many devices of this nature have a 'catch-all' disclaimer that they shouldn't be used by people with diabetes, but usually it will depend on the individual's own situation - it certainly sounds like a good idea to encourage good circulation 🙂
Please let us know how your tests go, and if there is anything we can help you with 🙂