Soria Natural Composor 16 Sinusol Complex XXI 25ml is a product designed to relieve the symptoms of sinus problems. Instructions for use Soria Natural Composor 16 Sinusol Complex XXI 25ml is a product used to relieve the symptoms of sinus problems. It contains a combination of herbal extracts that help decongest and reduce inflammation of the sinuses, relieving nasal congestion, facial pressure and headaches associated with sinus problems. It is used by diluting 25 ml of the product in half a glass of water and taking it three times a day, preferably before meals. It is important to follow the instructions for use and consult a doctor before using this product.