Viral social media posts warn against spraying perfume on the neck, claiming that fragrance chemicals penetrate the skin within seconds and directly impair the thyroid gland. Medical experts, however, clarify that these claims misunderstand basic human anatomy and pharmacology. While the skin on the neck is relatively thin, substances absorbed through the skin enter the systemic bloodstream rather than targeting underlying organs directly.

While perfume formulas can contain complex synthetic compounds and potential allergens, safety standards set by organizations like the International Fragrance Association (IFRA) strictly regulate or ban harmful phthalates in cosmetics. Experts advise that applying perfume to clothing or hair can reduce overall chemical contact and skin sensitivity, but spraying it on the neck poses no localized threat to thyroid function.