Natural D-Hist® by Ortho Molecular Products – Seasonal Sinus Support
Natural D-Hist® by Ortho Molecular Products is a capsule formula that combines quercetin dihydrate, stinging nettle leaves, bromelain, N-acetyl-L-cysteine, and vitamin C for adults navigating seasonal environmental challenges. The formula provides 400 mg each of quercetin dihydrate and stinging nettle leaves per serving.
Natural D-Hist® provides seasonal wellness support through a combination of flavonoid, botanical, proteolytic enzyme, antioxidant, and amino acid ingredients. Bromelain supplies 240 GDU per serving, while N-acetyl-L-cysteine and vitamin C complement the formula’s targeted support for nasal passages, mucus consistency, and normal immune activity.
Key Natural D-Hist® Benefits
- Promotes sinus passage support with quercetin dihydrate, stinging nettle leaves, and bromelain
- Helps maintain normal mucus viscosity through N-acetyl-L-cysteine and bromelain
- Provides respiratory health support for adults anticipating seasonal changes
- Offers immune balance support with vitamin C, quercetin dihydrate, and stinging nettle leaves
How Natural D-Hist® Works
Natural D-Hist® works by pairing several complementary functions in one capsule formula: quercetin dihydrate and vitamin C provide antioxidant activity, stinging nettle leaves support balanced immune signaling in the airways, bromelain supplies proteolytic enzyme activity, and N-acetyl-L-cysteine supports glutathione production and normal mucus consistency. This ingredient combination makes Natural D-Hist® a targeted quercetin supplement for seasonal nasal and respiratory wellness.
Key Functional Ingredients Include:
- Quercetin Dihydrate: Provides 400 mg per serving of a plant flavonoid used for antioxidant and seasonal immune support.
- Stinging Nettle (Leaves): Provides 400 mg per serving of Urtica dioica botanical material for airway and nasal passage support.
- Bromelain: Provides 100 mg and 240 GDU per serving of pineapple-derived proteolytic enzyme activity.
- N-Acetyl-L-Cysteine USP: Provides 50 mg per serving as a precursor used by the body to produce glutathione.
- Vitamin C: Provides 300 mg per serving as ascorbic acid USP for antioxidant and immune support.
Natural D-Hist® is a botanical allergy support formula made without gluten, yeast, artificial colors, or artificial flavors, according to the manufacturer’s Product Information Sheet.
Natural D-Hist® Is Formulated For
- Adults seeking seasonal support for comfortable nasal and sinus passages
- People who want quercetin dihydrate, stinging nettle leaves, bromelain, NAC, and vitamin C in one practitioner-positioned formula
- Individuals looking to maintain normal mucus consistency and respiratory comfort during environmental changes
Supplements support your health but do not replace a balanced diet. Always check with your healthcare practitioner if you have doubts about a new supplement. Or you may book a FREE product consultation with Holistic Health Partners, led by Carolyn Mulally BS, RN, HN-BC. You may also wish to explore our other Seasonal Allergies, Allergy Products, and Ortho Molecular Products collections.
Recommendation: Loading Dose: 2 capsules three times per day for 7-10 days. Maintenance: 2 capsules per day or as recommended by your health care professional.
Serving Size: 2 Capsules
Servings Per Container: 60
Vitamin C (as Ascorbic Acid USP) ... 300 mg (333% Daily Value)
Quercetin Dihydrate ... 400 mg
Stinging Nettle (Leaves) ... 400 mg
Bromelain (from Pineapple) ... 100 mg (240 GDU)
N-Acetyl-L-Cysteine USP ... 50 mg
* Daily Value not established.
Other Ingredients: Hypromellose (Natural Vegetable Capsules), Silicon Dioxide, Stearic Acid and Magnesium Stearate.
Does Not Contain: Gluten, yeast, artificial colors or flavors.
Storage: KEEP CONTAINER TIGHTLY CLOSED. STORE AT ROOM TEMPERATURE.
Warnings/Cautions: If you are pregnant or nursing, consult your physician before taking this product. As with all dietary supplements, some individuals may not tolerate or may be allergic to the ingredients used. Please read the ingredient panel carefully prior to ingestion. Cease taking this product and consult your physician if you have negative reactions upon ingestion. KEEP OUT OF REACH OF CHILDREN.
Frequently Asked Questions About Natural D-Hist®
What are the benefits of Natural D-Hist®?
Natural D-Hist® helps adults maintain nasal comfort, clear airway function, and a measured immune response when seasonal exposures become more noticeable. Quercetin dihydrate contributes flavonoid activity, while ascorbic acid adds antioxidant capacity and supports ordinary immune defenses. Stinging nettle leaves are included for botanical airway support. The pineapple enzyme bromelain retains proteolytic activity after oral absorption, and the formula supplies 240 GDU with each labeled serving. N-acetyl-L-cysteine serves as a building block for glutathione and assists the body’s handling of mucus thickness. These distinct roles give the product a broader purpose than a single-ingredient option: the ingredients address antioxidant status, mucosal conditions, and respiratory ease through separate but complementary pathways. Natural D-Hist® is intended as nutritional support, not as a substitute for evaluation or treatment by a qualified health professional.
Who should take Natural D-Hist®?
Natural D-Hist® is intended for adults who anticipate changes in their nasal or respiratory comfort when pollen and other common environmental materials vary through the year. The product may suit someone who prefers a practitioner-positioned blend rather than assembling separate quercetin, nettle, bromelain, vitamin C, and NAC products. A person who values a formula free from gluten, yeast, artificial colors, and artificial flavors may also find the published formulation relevant. Selection should still reflect individual circumstances because bromelain is sourced from pineapple, nettle is a botanical, and the formula contains several active compounds. Anyone who is pregnant, nursing, using medication, preparing for a procedure, or managing a complex health concern should discuss suitability with a health care professional. The loading and maintenance directions are different, so customers should follow the manufacturer’s label or personalized practitioner guidance rather than create their own schedule.
Are there any side effects of taking Natural D-Hist®?
Natural D-Hist® may not be tolerated by every person, and bromelain research has reported flatulence, nausea, and headache with oral use. The manufacturer gives several explicit safety directions: “If you are pregnant or nursing, consult your physician before taking this product.” The label also states, “As with all dietary supplements, some individuals may not tolerate or may be allergic to the ingredients used.” Customers should examine the ingredient panel before use because the product contains pineapple-derived bromelain, stinging nettle leaves, quercetin dihydrate, NAC, and excipients including hypromellose and magnesium stearate. “Cease taking this product and consult your physician if you have negative reactions upon ingestion.” People taking medication or planning a medical procedure should review the entire formula with a qualified practitioner before beginning it. “KEEP OUT OF REACH OF CHILDREN.” Natural D-Hist® should not be used when either protective seal is missing or damaged.
How does Natural D-Hist® support overall health?
Natural D-Hist® supports overall health by contributing nutrients and plant compounds to antioxidant defenses, glutathione synthesis, mucosal conditions, and routine immune regulation. Vitamin C cannot be produced by the human body, so the formula supplies ascorbic acid as an essential dietary nutrient. NAC contributes cysteine for endogenous glutathione formation, a process involved in cellular antioxidant protection. Quercetin dihydrate adds a flavonoid found naturally across many plants, and nettle leaves broaden the product’s botanical profile. Bromelain adds enzymatic activity measured at 240 GDU in the labeled serving. For someone whose wellness priorities include comfortable breathing during predictable environmental shifts, those mechanisms can complement sleep, hydration, food quality, and clinician-directed care. Natural D-Hist® remains a dietary supplement rather than a treatment; its contribution is targeted nutritional support within a wider health plan that accounts for medical history, current products, and individual tolerance.
These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.
8 Reviews Hide Reviews Show Reviews
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So far so good
On my 7th day of "loading" and can already tell the difference of before D-Hist and after. I'll stick with this through allergy season. So happy to find a natural remedy.
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Great product
My husband takes this everyday for seasonal and environmental allergies. For him, it works better than any OTC drug without the side effects.
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Ms.
This really helps here in PA>
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Review
I love this product, it takes care of my sneezing and no more sinus headaches or antibiotics for sinus infections. It has nipped those days in the bud!
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Review
We love this product. Non drowsy works very well on sinus headaches or heavy feeling fluid in you sinus cavity have used for 4 years as needed and keep it in our cabinet don’t want to be without this product
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Review
So glad I found this for my allergies!
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Review
this works great foe allergies. i take it daily. its a little pricey but covenent had a coupon witch helped
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D-HIST
I'm pretty much free of allergy symptoms since my integrative doctor recommended DHIST. Great product!

