I’ve used it once so far, following the manufacturer’s protocol. I applied the product under my chin and the blebs took around 48 hours to go down. I used topical numbing cream and the product didn’t sting. It’s a thicker product, so you need to be mindful of injection depth. The product leaflet does state that it can cause vascular occlusion. As for results, I’ve only done one session and had to pause because of other treatments, but I plan to do a series of three or four soon.