Skin Encyclopedia

An evidence-based skincare reference by SYNC Beauty.

Encyclopedia

Should Face Oil Go Before or After Moisturizer?

in most routines face oil is applied after moisturizer, because oils are occlusive and help seal in the water-based hydration underneath rather than pass through it. A lighter oil can...

Should Face Oil Go Before or After Moisturizer?

in most routines face oil is applied after moisturizer, because oils are occlusive and help seal in the water-based hydration underneath rather than pass through it. A lighter oil can...

How Long Until Azelaic Acid Works?

azelaic acid typically takes several weeks of consistent use before visible results appear, with many people noticing improvements in redness, breakouts, or uneven tone around the four to twelve week...

How Long Until Azelaic Acid Works?

azelaic acid typically takes several weeks of consistent use before visible results appear, with many people noticing improvements in redness, breakouts, or uneven tone around the four to twelve week...

Can I Use Azelaic Acid Twice a Day?

yes, azelaic acid is generally well tolerated and is commonly used once or twice daily, often in morning and evening applications. Starting once a day and increasing to twice daily...

Can I Use Azelaic Acid Twice a Day?

yes, azelaic acid is generally well tolerated and is commonly used once or twice daily, often in morning and evening applications. Starting once a day and increasing to twice daily...

Which Comes First, Vitamin C or Niacinamide?

either order works, but a common approach is to apply vitamin C first because it performs best at a low pH, followed by niacinamide. Both are water-based antioxidants that layer...

Which Comes First, Vitamin C or Niacinamide?

either order works, but a common approach is to apply vitamin C first because it performs best at a low pH, followed by niacinamide. Both are water-based antioxidants that layer...

Can I Use Retinol and Niacinamide Together?

yes, retinol and niacinamide can be used together and are often considered a complementary pairing, since niacinamide can help support the skin barrier and may reduce some of the irritation...

Can I Use Retinol and Niacinamide Together?

yes, retinol and niacinamide can be used together and are often considered a complementary pairing, since niacinamide can help support the skin barrier and may reduce some of the irritation...

How Do I Stop Retinol Peeling?

retinol peeling is a common early side effect that can be minimized by lowering the frequency of use, applying a smaller amount, and buffering with moisturizer. Building up tolerance slowly...

How Do I Stop Retinol Peeling?

retinol peeling is a common early side effect that can be minimized by lowering the frequency of use, applying a smaller amount, and buffering with moisturizer. Building up tolerance slowly...