In my medical aesthitician practice I am often asked, "What is glycolic acid and why is it used in skin care products?"
Glycolic acid is a non-toxic alpha hydroxy acid (AHA) occurring naturally in sugar cane and sugar beets. Other natural AHA'S are lactic acid from milk, malic acid from apples, citric acid from limes and lemons, oxalic acid from sauerkraut, and tartaric acid from grapes. Glycolic acid derived from sugar cane is found to be the most effective natural acid used for peeling due to its small single chain molecular structure, which allows better skin penetration.
Once glycolic acid is applied on the skin, it begins to break down the "intercellular glue" that binds the outer skin cells together. As this occurs, the outer skin cells are released and easily exfoliated away. Old skin cells that build up on the skins surface cause a dull lifeless appearance. The "rapid cell turnover" caused by the use of glycolic acid will bring a healthy new luster and clarity to the skin.
The outer layer of skin or epidermis is also the skins protective layer. Once the underlying dermis realizes its protective layer is being disturbed, it begins to kick out new skin cells causing the outer cells to turnover more rapidly. Once this cell buildup is removed from the outer layer, the glycolic acid can work more effectively on the second major layer of skin, the dermis. The dermis is our cushion or support for the epidermis, and that support eventually breaks down due to the aging process. A good analogy would be a basket weave that has aged and some of the weave has pulled apart weakening its strength. The same thing happens to the structure of the underlying dermis and the skin begins to weaken, wrinkle and sag, thus loosing its elasticity. Glycolic stimulates collagen and elastin in the dermis, helping to restore its support. Fine lines and wrinkles will diminish and a youthful glow appear as the skins health and support is restored.
Some acne scars can be diminished by continued use of glycolic acid. As the surface layer is continually exfoliated it begins to smooth out, while at the same time the under layer is building support. The acne scars soften and flatten out making them less visible. The results may not be apparent for several months.
Glycolic acid purges pores and causes them to behave more normally. As dead cells build up inside the follicle and harden, a plug is created that prevents sebum or oil from reaching the skins surface. Trapped sebum can result in acne and potential scarring. Glycolic acid will keep these pores clean and unclogged. White heads or milia are also a result of sebum trapped under the skin. If this pore was open the white head would be a black head and easily treated, but since it is trapped below the surface and has no way out, it will continue to impact until it is a hard seed. Continual use of glycolic acid will allow these tiny white seeds to be realesed. It may take a few months for this to happen, but with pores now free of debris they will appear smaller and less noticeable.
Overall, skin health can be restored and texture and tone returned to a youthful glow. The strength of glycolic right for you depends on your particular skin type and tone. I always suggest starting with a 10% solution for average skin types and 15% solution for thicker acne prone skin. Severely sun damaged skin may want to start lower and eventially work up to a 20% strength. Delicate and more sensitive skin should consider a 5% glycolic in a creme base moisturizer.
One important point to remember when purchasing glycolic acid products is that not all glycolic acids are created equal. The majority of glycolic products purchased in department stores and drug stores have been buffered to lower their ph to take the sting out. It may state on the bottle 10% to 12% glycolic acid. but in fact buffering glycolic acid drops its level to 5%, thus loosing most of its potency. If it doesn't sting this generally means it has been buffered.
Please feel free to respond to my glycolic acid information. I will welcome your questions and comments.
Sincerely,
Barbara