I HIGHLY recommend getting some samples to try out before buying his products. I made the mistake of buying the Nutritive Cleanser, Firming Toner, Advanced Face Firming Activator, Concentrated Restorative Cream, Face Moisturizer, and Eye Therapy before testing any of these products beforehand. I figured since I've been using Obagi and Retin-A for 2-3 years, I can probably tolerate anything! I wanted to stop using Obagi since it is such an aggresive treatment, so I switched to Dr. Perricone. After 2 weeks of using his products, my face was red and starting to breakout, but was told it's probably the products working to cleanse my skin out and I should give it 6 weeks to really see the results. By the end of 6 weeks, my face was super red and sensitive, it felt like the skin was burned off, and to top it off remember those breakouts I had at week 2? Well they never went away, it just got worse..I was getting larger cystic acnes around my mouth, chin and jawline. I stopped using Dr. Perricone and switched back to Obagi to clear out my acne and lighten the scars. It's been 10 months now, I have my clear skin back and the scars are not visible anymore, so I'm slowly phasing out my Obagi products and replacing them with La Mer...so far so good.