Nasal spray sodium chloride or sea water), isotonic (0.9% sodium chloride) and hypotonic (0.65% sodium chloride). Isotonic solutions have the same salt concentration as the human body, whereas hypertonic solutions have a higher salt content and hypotonic solutions have a lower salt content. Isotonic saline nasal sprays are commonly used in infants and children to wash out the thick mucus from the nose in case of allergic rhinitis. Hypertonic solutions may be more useful at drawing moisture from the mucous membrane and relieving nasal congestion. Natural nasal sprays that include chemical complexes derived from plant sources such as ginger, capsaicin and tea-tree
Nasal infix would be expected. For example, the PIE root "to win" would yield a nasal-infixed present stem . These presents are called "nasal infix presents" or simply "nasal presents" and are typically active transitive verbs, often with durative aspect. Since the linguistic ancestor of PIE is not known, there can only be speculations about the origins of the nasal infix. It has been suggested that it arose from a suffix (also related to and ) which underwent metathesis. Besides the nasal infix, PIE employs a number of affixes to mark the present: , , , , , and others. All in