Hista Block
Hista Blok NSP (item 776) is a phytomineral formula with quercetin, bromelain, nettle and orange. Supports the natural balance of histamine, helps reduce allergic manifestations. Capsules 540 mg.
Dietary supplement. Not a medicinal product. Consult a doctor before use. Results may vary.
Description
Hista Block NSP (SKU 776): Comprehensive Phyto-Support for Allergic Reactions
Hista Block NSP (SKU 776) combines three synergistically acting natural compounds: quercetin, bromelain, and stinging nettle leaf extract (Urtica dioica). Each component has demonstrated ability to modulate histamine and inflammatory responses without the sedative effects typical of antihistamine drugs.
Mechanism of Action
Quercetin: Mast Cell Stabilizer
Quercetin is a bioflavonoid that inhibits histamine release from mast cells and basophils, suppresses calcium-dependent exocytosis of allergy mediator granules, and reduces prostaglandin E2 and leukotriene synthesis (PMID: 12723939).
Bromelain: Proteolytic Inflammation Modulator
Bromelain is an enzyme complex from pineapple stems. It hydrolyzes pro-inflammatory proteins, reduces immune cell adhesion to airway epithelium, and decreases nasal secretion viscosity (PMID: 18327401).
Stinging Nettle: Natural Antihistamine Agent
Urtica dioica contains lectins that inhibit histamine-N-methyltransferase and block H1 receptors, reducing allergic rhinitis symptoms (PMID: 19140159).
Key Clinical Studies
- Masuda et al. (2003) — Quercetin inhibits mast cell degranulation (PMID: 12723939)
- Guo et al. (2008) — Bromelain reduces IgE-mediated reactions (PMID: 18327401)
- Deveraux et al. (2009) — Nettle reduces rhinitis symptoms (PMID: 19140159)
Composition (per capsule)
- Quercetin — standardized bioflavonoid
- Bromelain — from pineapple stems (Ananas comosus), standardized for proteolytic activity
- Stinging Nettle leaf extract (Urtica dioica) — standardized for lectins
- Gluten-free, lactose-free; GMP NSP (USA)
Applications
🌸 Allergic Rhinitis: Reduces sneezing, runny nose, nasal itch without drowsiness.
👁️ Allergic Conjunctivitis: Reduces eye watering and itching.
🫁 Seasonal Reactions: Support for pollen allergy and house dust reactions.
🍽️ Food Hypersensitivity: Modulates IgE-mediated reactions.
Nutrient Synergy
- Vitamin C NSP — potentiates quercetin’s antihistamine effect
- Magnesium NSP — stabilizes mast cell membranes
- Vitamin D3 NSP — immunomodulation, reduces atopic sensitization
💬 Consultant’s Comment
Hist-A-Block is my first-choice recommendation for clients with seasonal allergies and hypersensitivity. The formula is unique: quercetin — a natural stabiliser of mast cells (which release histamine); bromelain for enhanced absorption; N-acetyl-L-cysteine for respiratory tract and mucous membrane support; and stinging nettle extract, which has shown positive effects on allergy symptoms in research. In over 25 years of practice, I’ve found that starting Hist-A-Block 2–3 weeks before the peak allergy season — rather than at the onset of symptoms — delivers far better results.
— Oleksii Ignatenko, Independent NSP Partner · ID 220701
Composition
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Proprietary blend 540 mg:
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Nettle leaves (Urtica dioica)
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Quercetin (from the fruit of Soora japonica)
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Bitter orange, fruit (Citrus aurantium)
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Bromelain (from pineapple)
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OTHER INGREDIENTS: cellulose, stearate magnesium, silicon dioxide, dicalcium phosphate, gelatin, water.
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Does not contain gluten or lactose
Contraindications
Individual intolerance of product components. Pregnant and lactating women should consult a doctor before use.
Usage
Take 1-2 capsules twice a day with meals.
Store in a dry, cool, protected from light place.
What is Hist-A-Block and how does it differ from antihistamine tablets?
Hist-A-Block is NSP's natural formula to support the body during allergic reactions. Unlike pharmaceutical antihistamines, it does not chemically block histamine — instead, it supports the body's own mechanisms for regulating the immune response.
What are the ingredients in Hist-A-Block and what do they do?
The formula contains quercetin (stabilises mast cells, reduces histamine release), bromelain (improves absorption, has anti-inflammatory effects), N-acetyl-L-cysteine (supports the respiratory tract and mucus secretion) and stinging nettle extract (supports control of allergy symptoms).
When should I start taking Hist-A-Block — before or during allergy season?
For best results, start 2–3 weeks before the allergy season begins. Starting early allows quercetin to accumulate in tissues and prepares the immune system before allergen exposure.
Does Hist-A-Block help with year-round allergies (dust, pet hair)?
Yes — Hist-A-Block can be beneficial for any allergy involving hypersensitivity and excessive histamine release, whether triggered by pollen, house dust, pet dander or food sensitivities.
How should Hist-A-Block be taken for best results?
Follow the dosage on the label. Quercetin is better absorbed with food. At the start of the allergy season, the dose may be temporarily increased — check with an NSP consultant for personalised advice.
Can Hist-A-Block be combined with other NSP products?
It pairs well with NSP Vitamin C (enhances quercetin's effect) and NSP Omega-3 (anti-inflammatory synergy). Together they form a powerful natural defence against allergic reactions.
Are there any contraindications for Hist-A-Block?
Hist-A-Block is not recommended during pregnancy or breastfeeding without medical advice. Bromelain may interact with anticoagulants. Consult your doctor if you are taking prescription medications.
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