Nature's Sunshine Products est. 1972
Nature's Sunshine Products est. 1972
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HistaBlock can be used to safely manage allergy symptoms and support breathing, without the side effects commonly associated with over-the-counter and prescription antihistamines, decongestants and nasal sprays.

Powerful antioxidants help support the health of the airway passages and mucous membrane. Stinging nettle, quercetin, bromelain and bitter orange offer natural help with seasonal irritants.

This powerful blend enhances immune function and inhibits the release of histamine and other inflammatory compounds that initiate the sneezing, swelling and itching of allergic reactions. 

Indications for use

Provides nutrients that support the respiratory system in its battle against allergens, pollutants and toxins

Provides antioxidant protection

Supports mucous membrane health

Supports the immune system


Per 2 capsules

Proprietary blend 540mg
Nettle leaves  (Urtica dioica), Quercetin (from Sophora japonica fruit), Bitter Orange Fruit (Citrus x aurantium), Bromelain (from pineapple fruit, Ananas comosus)

Other ingredients: Dicalcium phosphate, capsule (gelatin, water), cellulose, vegetable magnesium stearate, silicon dioxide

Recommended Dose

Take 2 capsules twice daily

Customer Reviews

Based on 1 review
Jenny Martin

Amazing product. And natures sunshine delivers so quickly!