I have a really deep furrow in between my eyes could bellafill work for it? (photo)

Bellafill would be a good option.  It is FDA approved for 5 years.  This area is off label and you'll want to go to an experienced injector.  I would highly recommend using the microcannular technique to avoid any risk of intraarterial injection which can happen in this area.

Fillers, fat, and botox can help this area.  Please seek an expert as this area has blood vessles that need to be protected during injection to not cause any injury.  Best, Dr. Emer.

I would recommend using Botox first for the furrow between your eyes.  This will help to relax the muscle causing the furrow.  You could try Botox alone first and see how much improvement you get.  If there is still a furrow after the Botox, then a filler could be used for further improvement.  There are a variety of fillers, including Bellafill, that could be used.  The cost will vary by physician.

I have used Bellafill to those deep etched lines on the midforehead but only when my patient has committed to using Botox regularly in order to keep the dynamic muscle motion under control.  Injection of glabellar folds is a delicate process requiring firm knowledge of the anatomy of the forehead.  This should only be done by an experienced injector

Treatment of choice is to start with Botox and see how it improves over several sessions. Filler can be used there but there are additional risks with putting filler there so the recommendation is to place an HA filler. HA fillers can be dissolved if there is a vascular complication and Bellafill can not. Even if filler is placed, Botox should be used in conjunction. See link.