This doesnt really answer your question, but I thought I might share my experience with you about acne.
I had acne from the time I was 11 years old. I think I tried every product from supermarket washes, over the counter creams, prescription medications and antibiotics - none of it worked. At 24 I started using the 'oil cleansing method' on my skin (lots of information on the net if you google it) and now my skin is as close to flawless as its ever been. I just mix equal parts castor oil and extra virgin olive oil, massage it over my face for 5-10mins, then wash off with very hot water and a clean washcloth. I do this 3 times a week.
Sorry if I sound like an adverisement but I will tell anyone who'll listen about this because it worked so well for me. No chemicals, no animal testing and incredibly cheap (as you only use a small amount each wash). I hope you'll try it and have the same result I have