What it is
Methyl 2-octynoate is the methyl ester of 2-octynoic acid, an alkyne-containing compound valued in perfumery for its intense green, cucumber- and violet-leaf-like odor. In sunscreens and other cosmetics it appears only as a minor fragrance component to shape the overall scent. Because of its potency it is used at very low concentrations.
Safety & warnings
Methyl 2-octynoate is a recognized fragrance allergen and skin sensitizer, and its use is restricted under fragrance-industry guidelines, particularly when combined with other alkyne carbonate materials. People with sensitive or fragrance-reactive skin may wish to be cautious with products containing it.
Origin & sourcing
Synthetic. It is produced through organic synthesis as a fragrance material.
Questions everyone asks
Why is methyl 2-octynoate in a sunscreen?
It is a fragrance ingredient added in tiny amounts to give the product a green, fresh scent, not for any sun-protection function.
Can methyl 2-octynoate cause skin reactions?
It is a known fragrance allergen and potential sensitizer, so people with fragrance-sensitive skin may want to patch test or avoid it.