Chemistry

Replicating Cetaphil Gentle Skin Cleanser for all skin types

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This is such an interesting product – you’ll see what I mean when you look at the list of ingredients… Ingredients: Water, Cetyl Alcohol, Propylene Glycol, Sodium Lauryl Sulfate, Stearyl Alcohol, Methylparaben, Propylparaben, Butylparaben. We have very low levels of surfactants, and one that is considered the most irritating of what we have available to us....

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Neutrogena Oil-Free Cream Cleanser with Salicylic Acid

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Let’s take a look at a facial cleanser intended for acne prone skin, Neutrogena’s Oil-Free Cream Cleanser with Salicylic Acid (2%). Water: Necessary and welcome. Our solvent. Sodium C14-16 olefin sulfonate: We know this is a great surfactant for oily skin. Cocamidopropyl betaine: The amphoteric surfactant that increases mildness and viscosity. Cetearyl alcohol & stearyl...

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The importance of preservatives

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I found this little video on Cosmeticsinfo.org and thought I would share it with you! (Click on the “Importance of Preservatives” video on the right hand side.) Even though the mould appears in splotches on day 8, there’s a lot of contamination going on that we can’t see in the days beforehand. Yes, I know...

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Surfactants: Building viscosity – creating gels (updated)

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This is the last in the very long series of posts on surfactants before we get to some super fun formulating! We’ve covered the idea of increasing the micelle size and increasing the concentration of the surfactants, so let’s take a look at creating gels. There are a few ways to create a gel that...

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Surfactants: Building viscosity – increasing micelle size

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The second way to increase the viscosity of our surfactant-y creations is to increase the size of the micelles. (Please click here for a refresher on micelles!) We learned in the post about increasing mildness that increasing micelle size can reduce irritation, so you’re not only building viscosity, you’re decreasing irritation! (I love two-for-one processes!)...

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