• Glycolic acid: occurs naturally in, inter alia, unripe grapes, sugar-cane juice and sugar-beets. Has a keratolytic effect

• Malic acid: can be found in unripe apples, gooseberries and other fruits – in a higher concentration, this also has a slightly keratolytic effect

• Tartaric acid: tartaric acid and its salts are found in abundance in the vines, grapes, and leaves of the grapevine; has a slightly keratolytic effect

• Citric acid: is found in lemons, but also in many other fruits; has a keratolytic effect

• Saccharide isomerates: moisture-retaining substance based on natural sugars; it binds naturally to the skin’s keratin and is seen as a “moisture magnet”