Welcome! I recall seeing a series of old posts by "KW" on collagen injections. You can use the HW search function to find them. I don't think KW is on HW anymore. I have not seen him post in the time I have been on HW. I am sure there are other members that know more about this topic and will chime in. From what little I know, the injections are done using a cystoscope and have mixed long-term results.