Octyl Methoxycinnamate Allergy [SEP] I had a severe reaction to the first ingredient Octyl Methoxycinnamate  I had to be put on antibiotics. After researching the ingrident i found out it could cause other more severe side effects. I am glad I didn't use it long enough to have other symptoms. I would highly suggest doing research on that compound before deciding to put it on your face. It took two days for me to start developing the symptoms. They started out as a rash on the face that quickly spread to to the neck area.