I've been using EGF serum for a month now and finally see the difference. Battling with acne for last 6 month which I never suffered before, I have used all the product from drugstore brands to very high end from department stores. Now I absolutely love Stacked Skincare product now, but patience is definitely needed. First two weeks - my skin was purging which made me panic at first. I would have 1-2 new acne popping up on my chin and cheek overnight - EVERYDAY. Most of them were very inflamed enough to pop with cotton buds in the morning. Then, I cleansed applied EGF serum. Third week - I no longer had new acne popping up. My skin was much brighter but had a lot of acne scars and dark sports. I started to add sheet masks at night which gave me sting but no more. Fourth week - no more acne popping in the morning - visibly less redness on my skin in the morning. With makeup, I cannot see bumps any more. Only small dark spots are noticeable. I went through half of my bottle and decided to use EGF serum only at night routine. Can't wait to see more progress to come!