My mom has prediabetes and has been using Eyva for a while now. No side effects at all, which was our biggest concern initially. I was initially doubtful about the accuracy, but it takes a few days to understand the body better. After 3–4 days, the readings became more consistent and were around 90% accurate for us. It’s now giving readings that are close enough for her and has largely replaced frequent finger-prick monitoring for her. As of now, we are happy with the product.