One of the few mandelic acid formulas on the market. Contains 10 percent mandelic acid… I figured it would be a great addition to my skincare routine since I love utilizing acids in my skincare routine, but at times experience slight irritation or peeling from products with stronger AHAs like glycolic or lactic acid. However, the reactivity of both molecules will come from the carboxylic acid … The Ordinary Azelaic Acid Suspension 10%, $7.90 ... Lactic acid is the best researched AHA after … Lactic acid. Those with dry skin will want oleic acid on their radar. Basically, I do use this The Ordinary Mandelic Acid … The Ordinary Mandelic Acid 10% + HA exfoliates the skin. Try: The Ordinary Mandelic Acid 10% + HA, $6.80 at The Ordinary. Mandelic acid is another alpha-hydroxy acid, one that’s derived from bitter almonds. The major difference in structure lies in the fact that salicylic acid has a benzene ring, while lactic acid is a linear molecule. (Unlike lactic and glycolic, mandelic is not a naturally occurring acid and must be artificially created in a lab from bitter almonds.) Oleic Acid. Salicylic acid.