HistDAO
by XYMOGEN EP · capsule · 20 vegetable capsules
- On the market (NIH)
- UPC 8 71149 00225 1
- DSLD label 49471
- Serving 1 to 2 capsules; amounts per 2 capsules
- 10 servings
HistDAO by XYMOGEN EP lists 2 ingredients, 2 with an amount per serving of 2 capsules, such as 20 mg of vitamin C and 20,000 HDU of diamine oxidase. Its current label entered the NIH Dietary Supplement Label Database on August 25, 2015.
What is in HistDAO?
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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Vitamin Cas Ascorbic Acid | 20 mg | 33% | 90% of 18,583 products listing vitamin C give more (median 100 mg). |
| Diamine Oxidaseas Porcine Kidney Protein ConcentrateDiamine Oxidase (Form: from Porcine Kidney Protein concentrate) | 20,000 HDU |
Source: NIH ODS Dietary Supplement Label Database, label 49471 (entered August 25, 2015), version 9.4.0. See the label on DSLD. 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:
- 90% of the 18,583 products that print an amount of vitamin C list more than its 20 mg of vitamin C (median 100 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.
- Histamine SupportVillage Vitality · off the market same ingredients
- Hist-DAdaptogen Research 1 shared, 84% alike
- NaturDAO 1,000,000 HDUNaturdao 1 shared, 84% alike
- DAO Histaminase With BioflavonoidsAllergy Research Group 1 shared, 49% alike
- DAO Histamine Digester with BioflavonoidsNutriCology 1 shared, 49% alike
- HistDAOXYMOGEN 1 shared, 41% 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
- Directions: Take one to two capsules no more than 15 minutes before the consumption of histamine-rich foods, or take as directed by your healthcare practitioner.
- Warnings
- Cautions: Consult your healthcare practitioner before use, especially if you are pregnant or nursing.
- Keep out of reach of children.
- Avoid if allergic to pork or any other ingredient.
- HistDAO(TM) is not effective for symptoms of immune-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: Wheat, gluten, yeast, soy, dairy products, fish, shellfish, peanuts, tree nuts, egg, ingredients derived from genetically modified organisms (GMOs), artificial colors, artificial sweeteners, or artificial preservatives.
- Storage
- Storage: Keep tightly closed in a cool, dry place.
Source: label statements in DSLD label 49471.
What else is on the label?
Other ingredients: Microcrystalline Cellulose, HPMC, Sucrose, Rice Starch, Shellac, Hydroxypropylcellulose, Polyvinylpolypyrrolidone, hydrated Magnesium Silicate, Acetylated Corn Starch, Sodium Carboxymethylcellulose, Glycerol.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): VEGETABLE CAPSULES.
How many labels does HistDAO have?
3 labels are on file under this name since December 21, 2012: other sizes, label designs and reformulations. The current one leads this page.
- Label 49471 (current) Entered August 25, 2015 · on the market · 20 vegetable capsules · UPC 8 71149 00225 1
- Label 27857 Entered November 25, 2013 · off the market November 8, 2018 · 60 vegetable capsules · UPC 8 71149 00226 8
- Label 16340 Entered December 21, 2012 · off the market August 19, 2013 · 20 vegetable capsules
DSLD also links this label to: HistDAO (package size difference, same product), HistDAO (package size difference, same product).
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names XYMOGEN Exclusive Professional Formulas (distributor), Orlando, FL. All XYMOGEN EP products.