I've been using their product for the last 18 months and absolutely love it. I have tried a few different brands over the years egNivea, Loreal,etc, from cheap to expensive) recently I tried a bit of nutri-metics but wasn't happy with it and went back to Dr Lewins. I will never stray again. They actually have a web site you can go to (www.drlewins.com) and do a questionaire and they can then tell you what part of the range you require. Chemplus also have staff that can help you out with the range. You could also check to find out where one of their consultants are demonstrating & book in for a facial. They have ranges for the 20,30,40 &50 & over. After using it properly for 3 weeks my husband noticed the difference in my skin & he said it looked healthier and cleaner. When I'm asked my age I ask people what they think I am & normally get told any where between 35-45 and they don't believe me when I tell them I'm 48. Honestly my skin has never felt smoother & softer. I absolutely love it. Good luck!