Glycolic acid is one of the acids in the AHA (Alpha Hydroxy Acids) group. Since I started using this over a year ago, my skin has brightened, cleared and best of all, I've changed my skintype from oily/acne prone to oily/combo very few breakouts. Fine lines have certainly diminished and no one can accuse me of being dull! [ this applies to both skin and mind!
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It works by exfoliating dead skin cells that accumulate on the surface of your skin. If you don't exfoliate all this junk, skin looks dull, rough and pores can clog. AHA acids really are an all around product good for oily and anti-aging.
For me at least, the combination of BHA[beta hydroxy acid, or salicylic acid] and AHA keeps my skin clean, smooth and bright. I use a 20 percent solution of glycolic acid everyday, but I've worked up to this over the past year. If you have never used AHA before, start off slow, with lesser amounts and always, always do a patch test before you use it all over your face. If you find that glycolic acids [derived from sugar] don't work for you, other possible AHAs would be Malic acid [derived from applies] or Lactic acid [milk based]. For sensitive skin that can't tolerate any kind of AHAs, fruit enzyme acids [the kind derived from pineapple and papaya] are also very beneficial.
To start you off, there's a very decent drugstore line called Alpha Hydroxy.
Home - Alpha Hydrox - Neoteric Cosmetics, Inc. You can find this at most Walgreen's and CVS and it's a great way to introduce yourself to glycolic acids. Murad is also a very good line and a great way to get you started on skincare, but it tends to be a little pricey. I use a brand from a home-based company and it's proven to be extremely effective as well.
I cannot stress this enough. When you start using AHAs or other exfoliants on a regular basis, it'll be critical to use a facial sunblock
every single day. Increased cellular turnover will increase your sensitivity to harmful UVA rays. Damage from free radicals causes more obvious aging than nearly any other environmental factor.
To get you started on your own research, here's a few links: The first one is a very long thread from one of my favorite forums and contains a wealth of information. The last two links aren't quite as lengthy but should hopefully provide you with a little more food for thought.
1. Am I too young to use Lactic Acid peels biweekly?
2.
Alpha Hydroxy Acids
3. Glycolic Acid, Glycolic, Lactic, TCA Peel, At Home Chemical Peels, Exfoliating Peels, Facial Peels, Skin Peels