Concern by Liadiris Garcia: Scalp injections for alopecia – how extended does it take to perform/show the final results? I just turned 13 and today i received ten to fifteen injections in my scalp. I have to go again in 2 weeks to see whats going on, if theirs no results there gonna have to put much more injections. Very best response: Reply by sinsationalHello,sorry to hear about this but it typically will take about 8months. Give your response to this concern under!