Encyclopedia
Can I Use Retinol and Benzoyl Peroxide Together?
these two ingredients are often kept in separate routines because some traditional forms of retinol can be destabilized when applied at the same time as benzoyl peroxide, and combining them...
Can I Use Retinol and Benzoyl Peroxide Together?
these two ingredients are often kept in separate routines because some traditional forms of retinol can be destabilized when applied at the same time as benzoyl peroxide, and combining them...
Why Did My Vitamin C Turn Orange?
a color change toward yellow, orange, or brown is typically a sign of oxidation, meaning the ingredient has reacted with air, light, or heat over time. Oxidized vitamin C is...
Why Did My Vitamin C Turn Orange?
a color change toward yellow, orange, or brown is typically a sign of oxidation, meaning the ingredient has reacted with air, light, or heat over time. Oxidized vitamin C is...
How Should I Store Vitamin C?
keeping it in a cool, dark place away from heat, light, and air helps slow the oxidation that breaks down the ingredient. Opaque, air-restrictive packaging and a tightly closed cap...
How Should I Store Vitamin C?
keeping it in a cool, dark place away from heat, light, and air helps slow the oxidation that breaks down the ingredient. Opaque, air-restrictive packaging and a tightly closed cap...
Can I Use Expired Skincare?
it is generally not recommended, because ingredients can degrade, lose effectiveness, or become more likely to harbor bacteria after their expiration or period-after-opening date. Active ingredients and sunscreens in particular...
Can I Use Expired Skincare?
it is generally not recommended, because ingredients can degrade, lose effectiveness, or become more likely to harbor bacteria after their expiration or period-after-opening date. Active ingredients and sunscreens in particular...
Can Makeup Replace Sunscreen?
generally no, because makeup with added SPF is rarely applied thickly or evenly enough to deliver the protection stated on the label. It can supplement a dedicated sunscreen but is...
Can Makeup Replace Sunscreen?
generally no, because makeup with added SPF is rarely applied thickly or evenly enough to deliver the protection stated on the label. It can supplement a dedicated sunscreen but is...
Should I Use SPF on Cloudy Days?
yes, daily sunscreen is generally recommended even when it is overcast because a significant portion of ultraviolet radiation passes through clouds. UVA rays in particular reach the skin year-round and...
Should I Use SPF on Cloudy Days?
yes, daily sunscreen is generally recommended even when it is overcast because a significant portion of ultraviolet radiation passes through clouds. UVA rays in particular reach the skin year-round and...
