Why the Aliaxin SR is not FDA approved and not as famous as Juvederm and other brands?

Thank you for your question. There are different regulations in Sweden and USA. I suggest that you move forward and consult with a very reputable facial plastic surgeon in Sweden, or, consider a trip to USA for a surgery after doing a Skype consultation. It is important you discuss surgeon options with your family and friends for a recommendation. 
Best wishes,

Thank you for sharing your question.  Some international companies do not submit applications to the FDA due to the length of time and expense that seeking approval requires.  Though I do not have experience with Aliaxin I would recommend you research its use thoroughly to minimize the risk of complications and poor results.  Hope this helps.