Citronellal ek natural fragrance ingredient hai jo citronella, lemongrass aur doosre essential oils mein paya jata hai. Cosmetic formulations mein iska use mainly perfume aur scent ke liye hota hai. Yeh EU ke anusaar recognized fragrance allergen hai, isliye label par declare karna padta hai. Sensitive skin wale logon ko allergic reaction ho sakta hai agar unhe citronellal se sensitivity hai.