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| What is Propylene Glycol and why do you use it in the Salicylic/20 Gel Peel? |
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Salicylic acid is a white powder. In this pure form it cannot be applied to the face safely, and doing so would cause severe irritation and scarring. Further, while in its solid form, it would not be able to penetrate within the pores to unplug acne blackheads and reduce inflammation.
The Propylene glycol is a unique oil soluble solution which we use as a carrier for the salicylic acid that does not buffer the acid. Propylene glycol has a pH of 5-6 which is slightly acid. Propylene glycol also have the lowest comedonic rating of any of the available carriers meaning it will not contribute to breakouts.
In formulating this product for the face, we wanted to create a spot treatment that would not be irritating to the skin. For this reason we could not use the alcohol which is normally used. We instead dissolve the Salicylic acid in an anhydrogenous environment (one without water). This is quite a bit more expensive, but it allows us to create something that can be left on the face for a much longer time.
If you would like the see the salicylic acid, take a drop of water and a drop of our Salicylic /20. You will immediately see some of the Salicylic acid precipitate out of the solution.
By maintaining an anhydrogenous environment we preserve the lipid solubility of the entire solution. This allows us to greatly lessen the risk of excess irritation because of the nature of the molecules. Salicylic acid is oil soluble, which is great for two reasons. First, the outside layer of you skin is covered in oil, and being oil soluble, the salicylic acid is able to penetrate this outer layer.
However under this outermost layer is the dermis, and this layer is made up of mostly water. As you know oil and water don't mix, and this keeps the salicylic acid from moving down past the outer most levels of the epidermis, and is therefore is much safer than using alcohol/water solvent which would force the salicylic too deeply into the skin, disrupting this natural mechanism.
Please let us know if we can be of any further service.
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