I tried one of their gadgets some time ago. I have used other similar products, including a slendertone one, and a dermawand, for years with no bad effects.The LAB one you had to keep your hand on the metal bar on the side of the hand held wand, to make some sort of circuit. I used it as directed for two or three days. The next day I was struck down with the most debilitating bout of vertigo, I couldn’t even get out of bed as every time I moved, the room just spun . I gradually got better, but it took a couple of weeks. Now I can’t blame this on the gadget, but it seemed quite a coincidence. I’ve never suffered with vertigo before, or since.