Will a moisturising injectable stretch your skin in the long term? Is this something that you would need to continue for the foreseeable future? What happens if you stop after several years? Thank you.

No, it won’t. Injectable moisturisers don’t add any volume to the skin and even dermal fillers, which add volume to the face, don’t stretch the skin. To maintain the benefits of injectable moisturisers, yes, you need to keep up the treatments every six or nine months – how long they last depends on the brand. If you stop after several years, your skin will slowly go back to how it was before, but it still be better than it would have been without the treatment, because for the time that you’re doing it, the treatment will have ‘turned back the ageing clock’ for all the time that it was in place, if that makes sense.