• Formulating

  Why use 2 grades of inorganic sunscreens?

  Posted by pma on February 3, 2014 at 12:41 pm

  Kao almost always use 2 grades of inorganic sunscreens in their sunscreens (“regular” and “micronized”). Does anyone know why? Using just the micronized type would be easier… 

  Here there is an example:

  http://www.ratzillacosme.com/2011/grace-sofina-medicated-uv-cut-milk-spf50/

  mikebavington replied 10 years, 2 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Bobzchemist

  Member

  February 3, 2014 at 1:02 pm

  That’s…interesting - I’ve never seen that on an ingredient list before. Then again, putting “micronized Zinc Oxide” on an ingredient label would be (technically) illegal in the US. 

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  pma

  Member

  February 3, 2014 at 2:44 pm

  Bobzchemist: in Japan, if a product has any whitening ingredient approved by the Japanese government it’s called a quasi-drug, not a cosmetic. And if the sunscreen is a quasi-drug (bacause contains the whitening quasi-drug), you must show in the ingredients list if the inorganic actives are micronized, regular or both. 

  Japanese regulations for cosmetics are very different from the rest of the world… 
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  mikebavington

  Member

  February 4, 2014 at 1:27 pm

  Good thing they didnt have regulators around when Geishas became prevalent.

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