I have abandoned fillers in the glabellar lines after seeing two patients complicated by intravascular embolization/occlusion/ischemia. The complication is extremely rare, but if you do enough injections, it happens. I prefer Botox for this area.
Juvederm works well with or without Botox in the glabellar lines. A skilled dermatologist or plastic surgeon understands how to safely perform these filler injecitions.