“Based on what I see for sale online, this has some of the highest quantity mgs of ingredients for the best possible price. Since my doc recommends this brand, I'm doubly sold.”
Natural Histamine Support
A natural histamine supplement with quercetin and nettles for seasonal immune support.
- 5 active ingredients, not just one
- Professional-grade seasonal formula
- Ideal for sinus and respiratory seasons
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$51$54
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- Stabilizes mast cells to reduce histamine release
- Supports clear nasal and sinus passages
- Promotes healthy respiratory function
- Balances immune response to seasonal triggers
- Supports normal mucus viscosity
- Provides antioxidant protection
- 5 clinically studied active ingredients
- Flexible loading and maintenance dosing
Natural Histamine Support
The science behind our ingredients
Natural Histamine Support
Is this right for you?
Natural Histamine Support
Is this right for you?
- 01You deal with seasonal sensitivities
Elevated histamine during seasonal changes causes sinus congestion and respiratory irritation. This formula targets the root mechanisms — mast cells and histamine release.
- 02You want more than a single-ingredient formula
Most natural histamine supplements use just quercetin or nettles. This formula combines five active ingredients that work through complementary pathways.
- 03You need both acute and ongoing support
The loading dose addresses acute needs fast, while the maintenance dose supports year-round histamine balance during any season.
- 04You want a clean, professional-grade formula
No harsh ingredients, no drowsiness, no artificial additives. Physician-formulated and tested for people who want effective seasonal support.
01
You deal with seasonal sensitivities
Elevated histamine during seasonal changes causes sinus congestion and respiratory irritation. This formula targets the root mechanisms — mast cells and histamine release.
02
You want more than a single-ingredient formula
Most natural histamine supplements use just quercetin or nettles. This formula combines five active ingredients that work through complementary pathways.
03
You need both acute and ongoing support
The loading dose addresses acute needs fast, while the maintenance dose supports year-round histamine balance during any season.
04
You want a clean, professional-grade formula
No harsh ingredients, no drowsiness, no artificial additives. Physician-formulated and tested for people who want effective seasonal support.
why we’re different
Not all supplements are created equal
At Parsley, "professional grade" means every supplement is third-party tested for quality and purity, and manufactured in NSF/USP-certified, cGMP-compliant U.S. facilities that meet FDA standards.
Our clinicians know which supplements actually move the needle — and which don't. Every formula is selected for clinical evidence, optimal bioavailability, and meaningful dosing. Not what's cheapest to manufacture. What actually works.
| Parsley Supplements | Standard Supplements | |
|---|---|---|
| Physician-Formulated | ||
| Third-Party Tested | ||
| Clinically Dosed | ||
| Made in USA | ||
| Most Bioavailable Forms |
Ever get a cold where you're still sniffling weeks later? This supports histamine breakdown and soothes those inflamed sinuses.
Nisha Chellam, MD
Doctor
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Supplement FAQ
Parsley physicians have treated over 50,000 patients using a root-cause, functional medicine approach. That depth of practice informs every ingredient we select, every dose we use, and every formula we craft. The result is a standard most supplement brands can't meet: physician-formulated, third-party tested for purity and potency, clinically dosed, and manufactured in NSF/USP-certified, cGMP-compliant U.S. facilities that meet FDA standards.
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