Quantifying the moisturizing effects of your formulas on a budget - possible?

In the ideal world you'd empirically test all significant aspects of your formulas, to design better ones and to give people an accurate idea of what your product does.

Is there a way to do this on a budget for moisturizers? I know AMAlabs (not sure what's happening with the FBI probe) could do 2% SLS challenge testing and do tewameter readings for around $500/subject with two test points. You'd probably want to do more than one subject too to reach statistical significance. 

Are there and more affordable empirical methods to get at least an estimation of moisturization effect? How do you validate the efficacy of your moisturizer formulas?


  • PerryPerry Administrator, Professional Chemist
    You could buy your own Corneometer  and set up a test yourself. That might be less expensive in the long run. You can then get friends and family to be your subjects.  You need at least 30 subjects to get statistical significance. 
  • Depends on target p value and if you're more concerned with that or statistical power - if you have a potentially big effect then you don't need as many people to plausibly prove there's an effect. Also you can do multiple samplings per person to increase power. I should talk to a statistician about this!

    I had a corneometer, but I think it's preferable to use a 3rd party that has experience, access to test subjects and it could also unbias the experiment.
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