How long did it take you to see results?
It took me about 3-4 days to realize I was not getting any new ones. After 1 week, I knew my back had stopped getting new ones. After 2 weeks, my back was clear (of even little small ones). But the cysts went away fast.
So 1-2 weeks to get rid of the acne, and then a few months to get rid of the scarring. I stil; have hyperpigmentation scars and I've been on the magnesium since mid-October. So... But then again, my back acne was pretty severe. I was offered Accutane and declined.
I also did not mention it, but it helped with my chest acne too. My chest acne was mild though. Nothing major. But it still got rid of it.