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Ph measurement
Hello,
<div>I have a question and I hope someone knows its answer please.</div><div>Should I measure the pH value after every addition of active ingredients in my cosmetic formula?</div><div>
</div><div>For example, I have an Alpha Arbutin serum that is stable at a pH of 5-7. I added aloe vera juice to the water, and when I measured the pH, I found it to be 3.8.</div><div>Should I raise the pH to 5 for the Alpha Arbutin, or is it unnecessary?</div><div> Thanks in advance.</div><div>
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3 Replies
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It depends. Usually yes, you want correct pH before adding the ingredient, because some ingredients might be sensitive (for example Sodium Ascorbyl Phosphate). But some (Niacinamide) are that sensitive to pH, so it can be adjusted later.
I don’t know about Alpha Arbutin, but it is better to be safe - measure and adjust the pH before and after addition (because the ingredient itself can change it)
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Thank you for your response!
I have a question regarding a glycolic acid serum formulation.
For example, if I have a solution with a pH of 4 (composed of water and other ingredients) then i add glycolic acid to the medium, maybe a significant PH drop can be noticed for example below 3 (e.g., pH = 2).
Given that the optimal pH stability range for glycolic acid is between 3 and 4, would this pH shift negatively impact the effectiveness or stability of glycolic acid?
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Thank you for your response!
I have a question regarding a glycolic acid serum formulation.
For example, if I have a solution with a pH of 4 (composed of water and other ingredients) then i add glycolic acid to the medium, maybe a significant PH drop can be noticed for example below 3 (e.g., pH = 2).
Given that the optimal pH stability range for glycolic acid is between 3 and 4, would this pH shift negatively impact the effectiveness or stability of glycolic acid?
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