sunscreen with zinc oxide

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wxz123

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Does anyone knows how much zinc oxide I need ( % ?) to make a 30 SPF lotion?
Thanks
 
Different places sell different kinds of Zinc Oxide powder, micronized is a smaller crystal.

You need less micronized zinc oxide than non-micronized.
 
Sorry, sick today - forgot to answer.

Use 20% of micronized and 25% of non-micronized.

(for homemade only - if you want to sell it you must comply with FDA drug monographs and have your formulas lab tested.)
 
No problem :D

Do I really have to tested in lab before selling? i did not have a clue :roll:
 
Oh, yeah, SPF is a drug claim. Whole new ball game.
 
You need to start by doing some research at the FDA.
 

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