HistaBlock - Short Dated

Short Dated until end Feb 2027

Nature's Sunshine 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 off 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. 

• Provides nutrients that support the respiratory system in its battle against allergens, pollutants and toxins
• Provides antioxidant protection
• Supports mucous membrane health
• Supports healthy mucous membranes

Adults: Take 2 capsules with a meal twice daily

Per 2 capsules:
Proprietary blend 540 mg
Stinging Nettle (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

Keep out of reach of children. If symptoms persist, contact your healthcare professional. 

HistaBlock combines stinging nettle, quercetin, bitter orange and bromelain, ingredients commonly used for seasonal respiratory and sinus support. Nettle is a classic herb in this area, quercetin is a plant flavonoid often used for its antioxidant and histamine-support role, and bromelain is known for helping with nasal and sinus comfort.

Bitter orange adds citrus bioflavonoids and rounds out the blend. The reason these ingredients are often grouped together is that they support respiratory comfort from more than one angle, including antioxidant support and support for clear nasal passages. If you are looking at HistaBlock before buying, the key point is that it is aimed at seasonal upper respiratory comfort rather than general immune support alone.

What is quercetin in HistaBlock there for?
Quercetin is a flavonoid used for antioxidant support and is often included in supplements for seasonal respiratory comfort. In HistaBlock, it is one of the core non-herbal actives.

Why does HistaBlock include bromelain with nettle?
Bromelain is commonly used to support sinus and nasal comfort, while nettle is a traditional herb for seasonal respiratory support. Together, they help make HistaBlock more targeted for the upper airways.