There is data suggesting that skin is more prone to sun damage when skin has higher pH levels (>6). The daily use of sunscreen defends the acid mantle by protecting skin cells from sun damage and increasing the skin's ability to protect itself.
Some active ingredients used in sunscreen can increase skin´s optimal pH and are less effective at lowered pH. Ingredients like zinc oxide and titanium oxide (mineral or physical sunscreens) have an optimal “pH window” in which they are more effective. If the pH of zinc oxide or titanium oxide is too low, the oxides will actually dissolve and thus lose efficacy. I understand that some of you might be in favor of only using mineral or physical sunscreen, however with chemical filters or a mix, you most probably maintain a more optimal pH-balance. This is particularly something to consider if you have acne-prone skin, problematic skin, or a sensitive or (very) dry skin type as your skin barrier might already be compromised. Hope you will enjoy the sun well-protected, while maintaining healthy skin.
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