Alpha Hydrox Where To Buy
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α-Hydroxy acids, or alpha hydroxy acids (AHAs), are a class of chemical compounds that consist of a carboxylic acid with a hydroxyl group substituent on the adjacent (alpha) carbon. Prominent examples are glycolic acid, lactic acid, mandelic acid and citric acid.
Although these compounds are related to the ordinary carboxylic acids and are therefore weak acids, their chemical structure allows for the formation of an internal hydrogen bond between the hydrogen at the hydroxyl group and one of the oxygen atoms of the carboxylic group. The net effect is an increase in acidity. For example, the pKa of lactic acid is 3.86, while that of the unsubstituted propionic acid is 4.87; a full pKa unit difference means that lactic acid is ten times stronger than propionic acid.
Who Should Use It: Given their wide range of effects, most people can benefit from using AHAs, says Nazarian, so long as you find the right alpha-hydroxy acid and concentration of it for your skin type.
Don't Use With: Avoid using retinoids at the same time of day as AHAs, and be cautious when using both BHAs (beta hydroxy acids, such as salicylic acid) and AHAs in order to minimize irritation.
How often you use alpha-hydroxy acid depends on the particular acid, product, and skin. Follow product directions, but always start slow, using any AHA only once or twice per week and gradually increasing frequency as your skin can tolerate it.
Alpha hydroxy acids are a group of natural acids found in foods. Alpha hydroxy acids include citric acid (found in citrus fruits), glycolic acid (found in sugar cane), lactic acid (found in sour milk), malic acid (found in apples), tartaric acid (found in grapes), and others.
Various alpha hydroxy acids are applied to the skin (used topically) for moisturizing and removing dead skin cells, for treating acne and improving the appearance of acne scars, for improving the appearance of photo-aged skin, and firming and smoothing skin.
Treating sun damage when applied to the skin in a cream or lotion, but alpha hydroxy skin peels do not seem to work for this use.Treating dry skin when applied to the skin in a cream or lotion.
Treating an inherited skin disorder that causes dry, scaly skin (ichthyosis). Other conditions.More evidence is needed to rate alpha hydroxy acids for these uses.
Alpha hydroxy acids at a concentration of 10% or less as a lotion or cream are LIKELY SAFE for most people when applied to the skin appropriately and as directed. In some people, alpha hydroxy acids can make the skin extra sensitive to sunlight. Be sure to use a sunscreen while using alpha hydroxy acid products.
APPLIED TO THE SKIN:For treating skin wrinkled and aged by sunlight: Alpha hydroxy acid products containing lactic acid, tartaric acid, gluconolactone, or glycolic acid (GA) in 8% concentration are used. The alpha hydroxy acid gluconolactone has also been used in a 14% solution. These products are usually applied to the skin twice daily. For improving the appearance of acne scars: glycolic acid (GA) facial peels are used. Peels of increasing strength of 20%, 35%, 50%, and 70% are applied every two weeks. Peels are applied first for 2 minutes and then for a longer time (up to 4-5 minutes) before applying the next stronger solution. Completing the series at least 6 times is usually needed before skin looks better. People who do not like facial peels often use 15% GA lotion daily long-term instead. For lightening brown patches due to a condition called melasma: a 10% lotion of the glycolic acid (GA) is applied with a sunscreen to facial skin nightly for 2 weeks. Then a peeling program is done monthly for 3 months in a row. The peeling program features a 50% GA peel applied three times to the face and left on for a period of 2-5 minutes each time (first peel 2 minutes, second peel 4 minutes, and third peel 5 minutes).
Ditre CM, Griffin TD, Murphy GF, et al. Effects of alpha-hydroxy acids on photoaged skin: a pilot clinical, histologic, and ultras