Nature's Sunshine
Stock #: 776
HistaBlock
90 CapsulesStock #: 776
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Availability: In stock as of 05/15/2026
Expiration Date: 11/2026
Free returns for 90 days
Technical information
Ingredient list
| Ingredient | Amount |
| Proprietary Blend: Nettle leaves, quercetin, bitter orange fruit, bromelain | 540 mg |
Other ingredients: capsule (gelatin, water), cellulose, di-calcium phosphate, magnesium stearate, silicon dioxide
Recommended Use
Take 2 capsules twice daily.
Serving size: 2
Days Supply: 22
Cost Per Day: $1.32
Product Categories: Immune System, Allergies, Antioxidants, Breathing Aids, Respiratory System
UPC: 099904007765
Product Information
Why take this product?
- Battles pollutants, allergens, and toxins
- Contains antioxidant properties
- Assists in reducing swelling of mucous membranes
How it works
Nature’s Sunshine HistaBlock® nourishes the respiratory system and fights off irritants and pollutants to maintain respiratory health. The formula blends stinging nettle, quercetin, bromelain, and immature orange peel (which contains synephrine). HistaBlock also has antioxidant properties, assists in reducing mucous membrane swelling, and opens respiratory airways for easier breathing.
STOCK NUMBER: 776-1
Frequently Asked Questions
HistaBlock is Nature's Sunshine's targeted formula designed to nourish the respiratory system and support the body's natural response to environmental irritants and pollutants. It combines stinging nettle, quercetin, bromelain, and immature orange peel to promote clear breathing and healthy respiratory function.
HistaBlock features four complementary ingredients: stinging nettle, traditionally used to support a healthy histamine response; quercetin, a powerful antioxidant flavonoid that helps maintain healthy mucous membranes; bromelain, a pineapple-derived enzyme that supports comfortable breathing; and immature orange peel containing synephrine, which may help open respiratory airways. Together, they work synergistically to promote respiratory comfort.
The typical recommendation is 2 capsules with a meal, up to three times daily. Many of our long-time customers find it helpful to begin taking HistaBlock before seasonal challenges ramp up, so the body has consistent support when it's needed most.
HistaBlock is a great choice for anyone looking for natural respiratory support, especially those who are sensitive to seasonal environmental changes, pollen, dust, or other airborne irritants. It's also popular with customers who want antioxidant support alongside their respiratory care.
Both are part of Nature's Sunshine's respiratory support lineup, but they take different approaches. ALJ is an herbal blend focused on promoting clear breathing and supporting healthy mucous membranes, while HistaBlock combines herbs with quercetin and bromelain to specifically support the body's natural histamine response. Some customers even use both together during their most challenging seasons.
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