What it is
N-Stearoyl Dihydrosphingosine is a ceramide composed of a sphingosine backbone bonded to a stearic acid chain, structurally related to the lipids found in the skin's outermost layer. It is added to formulas to condition the skin and complement the natural lipid matrix, supporting a smooth surface feel. In sunscreens it is typically used at low levels within the lipid phase of barrier-oriented products.
Safety & warnings
Ceramides of this type are generally well tolerated, are not known fragrance allergens, and are used at low concentrations. They are broadly regarded as low-irritation and suitable for sensitive-skin formulas.
Origin & sourcing
May be produced synthetically or by fermentation/biotechnological routes; commercial ceramides are commonly made to a defined structure rather than extracted from skin.
Questions everyone asks
Is this the same as the skin's own ceramides?
It is a ceramide closely related in structure to those naturally present in the skin barrier, used to condition skin and reinforce its lipid layer.
Why is it in barrier-focused sunscreens?
It conditions the skin and complements the natural lipid matrix, helping the product feel comfortable on the skin.