Eyebright has been used to treat respiratory conditions including bronchitis, allergies, colds, and sinusitis. It contains astringent compounds known as tannins that may help to tighten the top layers of mucous membranes, thereby reducing mucus secretion, which in turn relieves irritation and improves tissue firmness. Consequently, many believe that eyebright can help relieve the numerous symptoms associated with allergies. Eyebright also contains many chemicals, including caffeic acid, which may have antibacterial effects.
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