α-Hexylcinnamaldehyde (hexyl cinnamal) is a common additive in the perfume and cosmetic industry as aroma substance.

It is found naturally in the essential oil of chamomile.

The commercial material often contains low levels of 2,6-di-tert-butyl-4-methoxyphenol as a stabilizer.

[2] Hexyl cinnamaldehyde is typically produced via crossed-aldol condensation of octanal and benzaldehyde.

Hexyl cinnamaldehyde is known to cause contact allergies in some individuals but the rate of incidence is low, with patch tests indicating ~0.1% of people to be susceptible.