My GF's daughter took it and it worked. I did not hear of any ill effects. I assume he has tried the topical stuff that everyone raves about?
Interestingly for me, I had bad acne as a teenager and tried all the Clearasil products on the market. It just kept getting worse. Come to find out many years later that I am allergic to Benzol Peroxide which is the active ingredient in Clearasil. DUH! Now salicic acid works like a charm (because at middle age, the acne is back. LIFE IS CRUEL!)