HistaBlock provides nutrients that support healthy respiratory function as the body battles irritants, pollutants and toxins. Stinging nettle provides well-known support against seasonal airborne substances. This formula provides antioxidant strength to help stabilize mast cells. The antioxidant quercetin has been used for its reputed effects in supporting the respiratory system. Quercetin may help stabilize cells that release compounds when exposed to irritants. Bromelain is an enzyme that works to help reduce the swelling of mucous membranes during times of respiratory stress. Bitter orange contains synephrine, which helps the body support open airways. 
Main ingredients: Nettle leaves, quercetin, Bitter orange fruit and bromelain.

Take 2 capsules with a meal twice daily.

Label Description:

Nettles Combination Herbal Combination Supplement

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Ingredients:

Serving Size 2 Capsules
Servings per container: 45
Amount Per 2 Capsules
Proprietary blend 540 mg*
Stinging Nettle Leaves (Urtica dioica)
Bioflavonoid (Quercetin dihydrate)
Fructus aurantia immaturi (Citrus aurantium)
Bromelain Fruit (Ananas comosus)
*Daily Value not established
Other Ingredients: Di-calcium phosphate, cellulose (plant fiber), maltodextrin, magnesium stearate (vegetable), silicon dioxide (powdered silica), gelatin, and water.

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Recommended Usage:

Take two capsules with a meal twice daily.

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Notes:

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This bottle was sealed for your protection. Do not use if inner seal is missing or damaged.

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Miscellaneous Information:

Supports Mucous Membrane Health
Minimizes the Effect of Irritants & Pollutants
Maintains Open Nasal Passageways
Nature’s Sunshine uses natural source materials in its products that are subject to color variation.
©2001 Nature’s Sunshine Products, Inc.
Product of U.S.A.

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