Sinol
Established in the USA, Sinol brings an all-natural nasal spray solution to cure headaches, congestions, and allergies and provide sinus relief. Sinol uses capsaicin as its main ingredient, which offers quick results. The company has been in business for more than 20 years, and its products are used by headache clinics and even the US Olympic team. Sinol's products are homeopathic, which means that they have no severe side effects and are non-addictive.