What it is
This ingredient is the diester formed between neopentyl glycol and heptanoic acid, giving a light, low-viscosity, dry-feeling oil. In sunscreen formulas it spreads easily, leaves a non-greasy finish, and helps dissolve and distribute organic UV filters such as those that are difficult to keep in solution. Because of its smooth slip it is also used to improve the sensory texture of emulsions and stick products.
Safety & warnings
Esters of this type are generally well tolerated on skin with a low irritation profile and are not associated with fragrance allergens. As a light, branched ester it tends to have low comedogenic potential, though individual response can vary.
Origin & sourcing
Synthetic; manufactured by esterifying neopentyl glycol with heptanoic (enanthic) acid, both of which are produced industrially.
Questions everyone asks
Does neopentyl glycol diheptanoate provide sun protection on its own?
No. It is an emollient and solvent that carries and helps dissolve UV filters, but it does not absorb or reflect UV light itself.
Why is it used in sunscreens?
It gives a light, dry, non-greasy skin feel and helps keep oil-soluble UV filters evenly dissolved and spread across the skin.