Can you have vitamin c, coffee, collagen powder or whey protein isolate powder 2 weeks prior to rhinoplasty?

Hi and thank you for your question.
All of the above mentioned supplements except for coffee should be absolutely fine. Some may even help speed your healing / recovery.  However, you must speak directly to your surgeon with regards to his or her preferences. Many surgeons prefer patients avoid coffee immediately before and after surgery.  
Hope this helps and good luck.
John Frederick