What it is
This ingredient is a mixture of straight-chain fatty alcohols ranging from twelve to fifteen carbons in length. Fatty alcohols of this type contribute emolliency and help build body and stability in emulsions. In sunscreens they can refine skin feel and assist in keeping the oil and water phases evenly combined.
Safety & warnings
Fatty alcohols in this carbon range are generally well tolerated and are commonly used in leave-on products. They are distinct from drying, low-molecular-weight alcohols like ethanol. Some longer-chain fatty alcohols have a low-to-moderate comedogenic reputation, so those very prone to clogged pores may wish to note their presence, though tolerance varies by individual and formula.
Origin & sourcing
Can be synthetic or derived from natural oils; the fatty alcohol blend may be produced from petrochemical feedstocks or from plant oils such as coconut or palm.
Questions everyone asks
Are C12-15 Alcohols drying like alcohol?
No. These are fatty alcohols that act as emollients and texture agents, unlike volatile alcohols such as ethanol that can feel drying.
What role do they play in sunscreen?
They serve as emollients and help stabilize the emulsion and adjust its thickness and skin feel.