PlainVitamins

Histamine Block

by Seeking Health · capsule · 30 capsules

  • On the market (NIH)
  • UPC 8 10007 52044 5
  • DSLD label 322646
  • Serving 1 capsule
  • 30 servings

Histamine Block by Seeking Health lists 2 ingredients, 2 with an amount per serving of 1 capsule, such as 10 mg of vitamin C and 4.2 mg of Dao2. Its current label entered the NIH Dietary Supplement Label Database on February 23, 2025.

What is in Histamine Block?

Each row as the label prints it, per serving of 1 capsule. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Histamine Block: Supplement Facts rows against the market (DSLD label 322646, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Ascorbyl Palmitate10 mg11%Vitamin C in Histamine Block against 18,583 products10 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg10 mg

95% of 18,583 products listing vitamin C give more (median 100 mg).

Dao2as Porcine Kidney Extractdiamine oxidase activity 10,000 HDU4.2 mgKidney in Histamine Block against 82 products4.2 mg per serving; the middle half of products list 30.5 mg to 483.75 mg, the median 63 mg.4.2 mg

85% of 82 products listing kidney give more (median 63 mg).

Source: NIH ODS Dietary Supplement Label Database, label 322646 (entered February 23, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • 95% of the 18,583 products that print an amount of vitamin C list more than its 10 mg of vitamin C (median 100 mg).
  • 85% of the 82 products that print an amount of kidney list more than its 4.2 mg of Dao2 (filed by NIH under kidney) (median 63 mg).

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

1 product lists the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Suggested use: Take 1 capsule no more than 15 minutes before consumption of histamine-rich foods, or use as directed by your healthcare professional.
Warnings
Cautions: Consult your healthcare professional before use, especially if you are pregnant or nursing.
Keep out of reach of children.
Contains ingredient derived from porcine (pig). Avoid if allergic to pork or any other ingredient. Histamine Block is not effective for symptoms of immune-related (anti-body- or IgE- related) food allergies, such as peanuts, shellfish, etc., or for gluten intolerance due to sensitivity or celiac disease.
Allergens and what it does not contain
Does not contain: Milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soy, gluten, GMO, artificial colors, or artificial flavors.
Storage
Storage: Keep tightly closed in a cool, dry place.

Source: label statements in DSLD label 322646.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Hypromellose, Water, Gellan Gum, Ascorbyl Palmitate.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Manufactured in the USA from globally sourced ingredients third-party independently tested.

How many labels does Histamine Block have?

7 labels are on file under this name since January 25, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 322646 (current) Entered February 23, 2025 · on the market · 30 capsules · UPC 8 10007 52044 5
  2. Label 292541 Entered July 18, 2023 · off the market July 21, 2023 · 30 capsules · UPC 8 10007 52044 5
  3. Label 292542 Entered June 22, 2023 · on the market · 90 capsules · UPC 8 10007 52045 2
  4. Label 233113 Entered August 23, 2020 · off the market June 17, 2022 · 90 capsules · UPC 8 10007 52045 2
  5. Label 233111 Entered August 23, 2020 · off the market June 17, 2022 · 30 capsules · UPC 8 10007 52044 5
  6. Label 210817 Entered January 25, 2020 · on the market · 90 capsules · UPC 7 10465 14908 3
  7. Label 210813 Entered January 25, 2020 · on the market · 30 capsules · UPC 7 00580 72369 5

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Seeking Health, LLC (distributor), Bellingham, WA. All Seeking Health products.

Where next?