Encyclopedia
Skin Anatomy
the structural organization of the skin, the body's largest organ, into distinct layers and cell types that work together to protect against the environment, regulate temperature, and sense touch. It...
Skin Anatomy
the structural organization of the skin, the body's largest organ, into distinct layers and cell types that work together to protect against the environment, regulate temperature, and sense touch. It...
What Is a Humectant?
an ingredient that attracts and binds water, drawing moisture into the upper layers of skin to keep it hydrated. Common humectants include hyaluronic acid, glycerin, urea and panthenol.
What Is a Humectant?
an ingredient that attracts and binds water, drawing moisture into the upper layers of skin to keep it hydrated. Common humectants include hyaluronic acid, glycerin, urea and panthenol.
What Is the Skin Barrier?
the skin's protective outer layer (the stratum corneum) that keeps moisture in and irritants, allergens and microbes out. It is often described as a "brick and mortar" wall of skin...
What Is the Skin Barrier?
the skin's protective outer layer (the stratum corneum) that keeps moisture in and irritants, allergens and microbes out. It is often described as a "brick and mortar" wall of skin...
Can You Use Vitamin C and Retinol Together?
yes — vitamin C and retinol can be part of the same regimen and are not dangerous together. Many people simply separate them (vitamin C in the morning, retinol at...
Can You Use Vitamin C and Retinol Together?
yes — vitamin C and retinol can be part of the same regimen and are not dangerous together. Many people simply separate them (vitamin C in the morning, retinol at...
Can I Use Retinol Every Day?
a common question with a nuanced answer: many people can eventually use retinol nightly, but you should build up to it. Starting slowly — a couple of nights a week...
Can I Use Retinol Every Day?
a common question with a nuanced answer: many people can eventually use retinol nightly, but you should build up to it. Starting slowly — a couple of nights a week...
Does Natural Always Mean Safer?
a widespread misconception. "Natural" does not automatically mean gentler or safer, and "synthetic" does not mean harmful. Safety depends on the specific ingredient, its concentration and how your skin responds...
Does Natural Always Mean Safer?
a widespread misconception. "Natural" does not automatically mean gentler or safer, and "synthetic" does not mean harmful. Safety depends on the specific ingredient, its concentration and how your skin responds...
