PlainVitamins

Histamine Block Plus

by Seeking Health · capsule · 60 capsules

  • On the market (NIH)
  • UPC 8 10007 52158 9
  • DSLD label 322647
  • Serving 2 capsules
  • 30 servings

Histamine Block Plus by Seeking Health lists 12 ingredients, 12 with an amount per serving of 2 capsules, such as 100 mg of vitamin C, 20 mg of thiamine, 10 mg of riboflavin and 25 mg of niacin. Its current label entered the NIH Dietary Supplement Label Database on February 23, 2025.

What is in Histamine Block Plus?

Each row as the label prints it, per serving of 2 capsules. 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 Plus: Supplement Facts rows against the market (DSLD label 322647, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Ascorbic Acid100 mg111%Vitamin C in Histamine Block Plus against 18,583 products100 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg100 mg

50% of 18,583 products listing vitamin C give more (median 100 mg).

Thiamineas Thiamine Hydrochloride20 mg1,667%Thiamin in Histamine Block Plus against 9,830 products20 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg20 mg

Higher than 69% of 9,830 products listing thiamin (median 5 mg).

Riboflavinas Riboflavin 5-Phosphate Sodium10 mg769%Riboflavin in Histamine Block Plus against 9,824 products10 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg10 mg

Higher than 61% of 9,824 products listing riboflavin (median 4 mg).

Niacin25 mg156%Niacin in Histamine Block Plus against 12,413 products25 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg25 mg

Higher than 56% of 12,413 products listing niacin (median 20 mg).

Vitamin B6as Pyridoxal 5-Phosphate7 mg412%Vitamin B6 in Histamine Block Plus against 15,277 products7 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg7 mg

Higher than 52% of 15,277 products listing vitamin B6 (median 6 mg).

Pantothenic Acidas D-Calcium Pantothenate10 mg200%Pantothenic Acid (Vitamin B5) in Histamine Block Plus against 10,060 products10 mg per serving; the middle half of products list 6 mg to 50 mg, the median 12 mg.DV 5 mg10 mg

52% of 10,060 products listing pantothenic acid (vitamin B5) give more (median 12 mg).

Magnesiumas Albion Di-Magnesium Malate50 mg12%Magnesium in Histamine Block Plus against 14,003 products50 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg50 mg

59% of 14,003 products listing magnesium give more (median 86 mg).

Zincas Zinc Gluconate5 mg45%Zinc in Histamine Block Plus against 13,186 products5 mg per serving; the middle half of products list 5 mg to 15 mg, the median 11 mg.DV 11 mgUL 40 mg5 mg

72% of 13,186 products listing zinc give more (median 11 mg).

Copperas Copper Gluconate0.5 mg56%Copper in Histamine Block Plus against 6,468 products0.5 mg per serving; the middle half of products list 0.5 mg to 2 mg, the median 1 mg.DV 0.9 mgUL 10 mg0.5 mg

68% of 6,468 products listing copper give more (median 1 mg).

Alpha-Ketoglutaric Acid150 mg
SAMeas Disulfate Ptoluensulfonate100 mgSAMe in Histamine Block Plus against 163 products100 mg per serving; the middle half of products list 200 mg to 400 mg, the median 200 mg.100 mg

82% of 163 products listing SAMe give more (median 200 mg).

Pyrroloquinoline Quinoneas LifePQQ7 mgPyrroloquinoline Quinone in Histamine Block Plus against 168 products7 mg per serving; the middle half of products list 10 mg to 20 mg, the median 10 mg.7 mg

80% of 168 products listing pyrroloquinoline quinone give more (median 10 mg).

Dao2as Porcine Kidney Extractdiamine oxidase activity 5,000 HDU2.1 mgKidney in Histamine Block Plus against 82 products2.1 mg per serving; the middle half of products list 30.5 mg to 483.75 mg, the median 63 mg.2.1 mg

96% of 82 products listing kidney give more (median 63 mg).

Source: NIH ODS Dietary Supplement Label Database, label 322647 (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:

  • 96% of the 82 products that print an amount of kidney list more than its 2.1 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?

The products whose ingredient lists overlap most with Histamine Block Plus's, rare ingredients counting for more.

  • Pqq 20ProCaps Laboratories · off the market 7 shared, 42% alike
  • PQQ 20 mgProCaps Laboratories · off the market 7 shared, 42% alike
  • PQQ 20 mgProCaps 7 shared, 42% alike
  • CoQ10 200 + PQQ 20ProCaps Laboratories 7 shared, 38% alike

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 2 capsules as needed, with or without food, 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 (ping). Avoid if allergic to pork or any other ingredient. Histamine Block is not effective for symptoms of immune-related (antibody 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 322647.

What else is on the label?

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

How many labels does Histamine Block Plus have?

2 labels are on file under this name since August 24, 2023: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 322647 (current) Entered February 23, 2025 · on the market · 60 capsules · UPC 8 10007 52158 9
  2. Label 292543 Entered August 24, 2023 · on the market · 60 capsules · UPC 8 10007 52158 9

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?