DAO cofactors
Substances that the DAO enzyme needs to do its job, mainly copper and vitamin B6. Without them, the enzyme cannot work at full capacity, even if there is enough of it in the body.
DAO belongs to a group of enzymes that cannot function without copper. Copper is a fixed part of the catalytic site where histamine is broken down; without it, nothing happens. The second crucial substance is vitamin B6, specifically its active form, pyridoxal-5-phosphate. Vitamin C is also frequently mentioned, as it accelerates the breakdown of histamine under laboratory conditions.
This leads to an important practical takeaway: when the body lacks copper or vitamin B6, a person can experience low DAO activity even without any genetic predisposition. A deficiency in B6 is by no means rare—it appears with long-term unbalanced diets, the use of certain medications, or higher alcohol consumption.
At the same time, it is necessary to remain realistic. Supplementing cofactors is not a miracle solution, and evidence that it actually helps people with histamine intolerance remains limited for now. It makes sense primarily where a true deficiency exists, which can be confirmed by blood tests.
Furthermore, high doses are not harmless. Long-term excessive intake of vitamin B6 can damage peripheral nerves in the limbs. High doses of zinc, on the other hand, impair the absorption of copper—the very element DAO relies on. It is therefore far better to discuss supplementation with a physician or a clinical dietitian rather than setting up a regimen based on internet articles.
Related terms
DAO enzyme supplementation for better histamine breakdown in histamine intolerance.
DAO enzyme supplementation for better breakdown of dietary histamine in people with HIT.
The main enzyme responsible for breaking down histamine in the body. Its deficiency is related to HIT.
An enzyme that breaks down biogenic amines, such as tyramine or serotonin. It also completes the degradation of histamine after it has been processed by HNMT.
Substances that reduce the activity of the DAO enzyme, which worsens the breakdown of histamine.