Evidence supporting the use of: Sea water
For the health condition: Allergies (respiratory)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Seawater, often in the form of saline nasal irrigation solutions, is supported by scientific evidence for use in treating respiratory allergies, such as allergic rhinitis. Numerous clinical studies and systematic reviews have demonstrated that saline nasal irrigation can improve symptoms of nasal congestion, sneezing, and rhinorrhea in individuals with allergic rhinitis. The mechanism is thought to involve the physical removal of allergens (like pollen and dust), inflammatory mediators, and mucus from the nasal passages, thereby reducing the overall inflammatory response.

Most studies use isotonic or slightly hypertonic saline solutions, which can be derived from seawater or formulated to mimic its mineral content. Commercial products containing purified seawater are widely available for nasal irrigation and have been shown to be generally safe and effective as adjunctive therapy alongside standard treatments such as antihistamines or intranasal corticosteroids. The European Academy of Allergy and Clinical Immunology and other professional organizations recognize saline irrigation as a beneficial, low-risk intervention for allergic rhinitis.

However, while the evidence supports its role as part of a broader management strategy, saline (including seawater-based) irrigation is not a standalone cure and does not address the underlying immune mechanisms of allergy. The evidence is strongest for symptom relief and improved quality of life, with moderate-quality studies supporting its use.

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