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pH in skincare formulations
pH is pretty important when it comes to performance and stability of cosmetic formulations. The ideal pH for different products varies from formulation to formulation instead of the skin pH of 5.5, some nifty chemistry dictates pH be suited to the formulation efficacy instead of matching it to the skin. Where can I access more exhaustive info about why and how different formulations need to be at different pH.
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1 Reply
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I do not have any source for this, [hopefully someone has], but the main thing you would worry about is actives. The active or the product type would tell you what pH do you need.
Let’s say you are formulating with ascorbic acid .. the best pH for its stability (even it will still be around 2 months) would be 3 - 3.5.
Conditioners need lower pH for its strong charge - 4 - 4.5.
Other active might need pH 6-7, therefore you would formulate for this pH (I believe MAP would need this) etc ….So investigate every ingredients, how to incorporate it into your formula and stick to it.
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