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Natural D-Hist is a targeted blend of flavonoids, antioxidants, proteolytic enzymes and botanicals designed to provide comprehensive support for seasonal challenges caused by common environmental allergens. The formula includes quercetin, bromelain, stinging nettles leaf, and N-acetyl cysteine. The powerful combination actively promotes healthy nasal and sinus passages for individuals with elevated histamine and respiratory irritation. Suggested Use Loading Dose: 2 capsules three times per day for 7-10 days or as recommended by your health care professional. Acute: 2-3 capsules as needed or as recommended by your health care professional. Maintenance: 1 or more capsules per day or as recommended by your health care professional.