Glycolic Acid is bit more aggressive than mandelic and lactic acids. Glycolic acid is an alpha hydroxy and will exfoliate the outer layers of your skin. Glycolic acid is a good all-around acid for normal-oily skin types to exfoliate and rejuvenate the skin, as well as improving the appearance of acne, acne scarring, wrinkles, and fine lines.Benefits:

Skin is better able to absorb moisture…use of topical moisturizers is greatly enhanced.
Removes dead, dry, dull cells on surface layer of skin.
Diminishes appearance of fine lines.
Refines and smoothes skin texture.
Unclogs and cleans dirty pores on acne-prone skin.
All over revival of skin to give a more youthful appearance.
No “down time”.

The effects of Glycolic Acid are cumulative.Use as directed (enclosed with kit instructions) for maximum benefit.  Professional Recommendations:

Estheticians recommend having 6-8 glycolic acid treatments in 1-2-week intervals for optimum results.
The average cost of one visit to an esthetician is $60.00 – $80.00