I've experimented with several Glycolic creams in recent months on my middle age skin, but this one seems to have all the positive results without any irritation even with a 20% glycolic acid content. There's was a noticeable difference from the very first application. My skin felt and looked more supple, firm  and hydrated with an even coloring. After a few weeks of use, I also noticed several sun spots on my forehead are also lightening and are almost undetectible. I use it only at night, avoid the thin skin under the eyes, and apply oil on my face as well, like Tamanu  or Emu. Extremely happy and enthusiastic! Everyone's skin and sensitivity are unique, but for me this is the best product I've found and will without question reorder it after I've used up this first experimental jar!