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Home Cosmetic Science Talk Formulating Skin Isn’t zinc oxide sunscreen @ph7 harmful for skin acid mantle?

  • Isn’t zinc oxide sunscreen @ph7 harmful for skin acid mantle?

    Posted by Abdullah on June 22, 2022 at 3:22 am

    Zinc oxide provide sunscreen at pH 7 only. 
    If we use zinc oxide sunscreen 2 or 3 times a day, it will rise the pH of skin to 7. 

    Now if skin adjust it’s pH and acid mantle, sunscreen will not be effective at that acidic environment. If it does not adjust the pH and acid mantle, sunscreen will be effective but acid mantle will be damaged if skin is at pH 7 all day long.

    This is how i am thinking 🤔 about zinc oxide sunscreen. Am i right or wrong? 
    Please correct me. 

    jemolian replied 9 months, 1 week ago 2 Members · 1 Reply
  • 1 Reply
  • jemolian

    June 22, 2022 at 6:50 am

    I think the issue is if there’s any data to show if the skin’s pH is affected by pH 7 products over a period during the day. People can always apply other products to bring it back down if required after cleansing the sunscreen.

    Not sure if there’s any data if the performance of the zinc sunscreen will be affected by pH once applied. I believe the pH issue is that it’s self regulating at pH 7 as the product?