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Can You Mix Aha+ W/ Cetaphil Lotion?


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#1 XXYY

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Posted 27 June 2013 - 01:51 PM

Or do any of the ingredients 'deactivate' it? I just use Cetaphil Moisturizing Lotion. It seems like it would be fine but I wanted to make sure so I dont waste half a tube of AHA.



#2 Tom Busby

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Posted 27 June 2013 - 04:27 PM

For 230 ml of Cetaphil lotion, I add 0.15% citric acid and 1 gram of Salicylic Acid (to compound a 0.5% SA lotion).  One gram of Salicylic acid dissolves in 1ml of USP Glycerin and 2ml of 100% Isopropanol, heated in water bath to 130 degrees, and then the SA will not precipitate out of 200ml of lotion, which otherwise does, without the Glycerin.  This body lotion has a measured pH of 4.5, using a pH test strip. 

 

Citric acid is water soluble, and has a very low pH, and costs $8 at Ace Hardware for 7.5 ounces.

 

Here's a discussion of the difference between SA and AHA:  http://dermatology.a...cts/a/aha_2.htm

 

I like SA because it's effective for exfoliation even at low percentages, and it costs only $15 for half pound if you mail order it, and I can't mail order pure AHA --I think because pure AHA is explosive at high concentrations. 

 

I'm not saying SA is better than AHA for you, but I thought my example might be helpful.



#3 Tom Busby

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Posted 27 June 2013 - 05:09 PM

Oh, I was overthinking it.  Just take a 1.5 ounce shot glass, and mix a small test batch at whatever ratio you are planning to use.  It the Cetaphil doesn't turn into water instead of a cream, or turn into clumps, or turn slightly brown-red, probably nothing reacted and the mix is ok.






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