DAO Enzyme Supplements Australia

Diamine oxidase (DAO) is an enzyme produced in the gut lining that breaks down histamine from food before it is absorbed. DAO enzyme supplements are not antihistamine medications – they support the body’s existing capacity to process dietary histamine at the point of digestion, which is a distinct mechanism from blocking histamine receptors after it has entered circulation.

This form is most relevant for people who notice inconsistent reactions to high-histamine foods – aged cheese, fermented products, wine, or reheated leftovers – particularly when those reactions are food-triggered rather than environmental. If a practitioner has pointed toward DAO enzyme specifically, or your own research has led you here, the formulas stocked here cover a range of doses, sources, and formulation approaches to suit different protocols.

Key principle: HDU (Histamine Degrading Units) is the standard activity measure for DAO enzyme – when comparing products, the HDU count per serving matters more than the milligram weight, because enzyme potency varies significantly between sources and preparations.

DAO Enzyme products at Fairfield Nutrition

Product	Brand	Best For	Key Ingredients / Notes
Pure Encapsulations DAO Enzyme for Histamine – 60 caps	Pure Encapsulations	Standardised standalone DAO	Diamine oxidase standardised to 26,000 HDU per serving
Seeking Health Histamine Nutrients – 60 Caps	Seeking Health	DAO with nutrient co-factors	DAO enzyme combined with co-factor nutrients and antioxidants that support histamine processing
Histamine Bundle	Seeking Health	Two-formula protocol bundle	Seeking Health DAO Enzyme paired with HistaminX B-vitamin and botanical formula
Omne Diem Menopause Complete – 30 caps	Omne Diem	Hormonal transition formula with DAO	DAO enzyme with Estro8PN (hops extract), flaxseed lignan, black cohosh – not a standalone DAO product
Seeking Health DAO Enzyme (formerly Histamine Digest)	Seeking Health	Porcine-derived standalone DAO	DAOgest diamine oxidase sourced from porcine kidney extract
Omne Diem Histamine Digest (30,000 HDU)	Omne Diem	High-dose standalone DAO	4.2mg DAO at 30,000 HDU per capsule – highest per-capsule HDU count among standalone formulas

How to choose between DAO Enzyme products

The main question is whether you need DAO enzyme on its own – so you can adjust the dose cleanly before meals – or as part of a broader formula that includes co-factor nutrients or condition-specific support.

Standalone DAO enzyme: Pure Encapsulations DAO Enzyme, Seeking Health DAO Enzyme, and Omne Diem Histamine Digest are all single-focus DAO formulas. Omne Diem delivers the highest per-capsule dose at 30,000 HDU; Pure Encapsulations offers 26,000 HDU per serving in a practitioner-grade format; Seeking Health uses DAOgest, a porcine kidney-derived DAO source used across clinical protocols.
DAO with co-factor nutrients: Seeking Health Histamine Nutrients adds co-factor nutrients and antioxidants alongside DAO – suited to protocols that address both enzyme activity and related nutrient status at the same time rather than with separate products.
Bundle format: The Histamine Bundle pairs Seeking Health DAO Enzyme with HistaminX, a B-vitamin and botanical formula. Practical for those starting a two-formula protocol and wanting both products together.
Condition-specific formula with DAO: Omne Diem Menopause Complete includes DAO alongside botanical ingredients specific to hormonal transition. This is not a standalone DAO product and is appropriate only where both concerns are relevant.

For most people starting with DAO enzyme, a standalone formula with a clearly stated HDU count is the practical entry point – it allows dose adjustment without introducing other variables.

If you are exploring histamine support more broadly, the Histamine Support category covers complementary nutrient-based and botanical approaches that practitioners often use alongside DAO enzyme.

All DAO Enzyme products stocked at Fairfield Nutrition are shown below.