Thank you for your inquiry.
Both a 45 degree and 90 degree injection angle are equally acceptable. In our practice, we let the nurse administer the injection according to her own comfort in regards to the angle of injection. You will be fine by simply accepting the specific instructions for each individual extract regardless of whether or not the physician has specified a 45 or a 90 degree injection angle.
Thank you again for your inquiry and we hope this response is helpful to you.
Phil Lieberman, M.D.