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DHA and effect on UVA Sunscreen filters
i am thinking of formulating a sunscreen (SPF and UVA) including dihydroxyacetone. However, i have heard anecdotally that they are incompatible, in that the DHA will quite quickly adversely affect the UVA value of the product. can anyone point me in the direction of any literature that supports this? I do not want to put the product through expensive SPF/UVA testing and for it to fail! thanks
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2 Replies
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@ERP I cannot site any literature on hand, but I am pretty sure DHA lowers the extinction coefficient for organic sunscreens. If you are using TiO2 or ZnO it may not matter and you may be onto something there. I must say that the DHA is inducing melanin just as the sunscreen is inducing it at the same time. Is this redundant? Maybe that’s why nobody has done it?
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DHA is not recommended to be used with metallic oxides as it will degrade the DHA. Here is a good summary article; https://knowledge.ulprospector.com/413/pcc-stabilizing-sunless-tanning-formulations/
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