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For Healthy Sinus Support Herbal SupplementApproved by Michael Tierra L.Ac O.M.DStinging nettle is one of the most important tonics of western herbal traditions and was traditionally used to support healthy sinuses. Modern research documents this use in biological assays demonstrating it reduces the biosynthesis of arachidonic acid and leukotrienes that play key roles in healthy immune responses and sinus health.