XYMOGENHistDAO - DAO Enzyme Supplement to Supports Healthy Degradation of Food-Derived Histamine - Diamine Oxidase for Digestive Health 20,000 HDU Per Serving (60 Tablets)

This is absolutely the gold standard in DAO supplements available on Amazon. I have tried several brands. They’re all kind of expensive, but nothing works like this one. I take it first thing on waking and wait 20 to 30 minutes for best effect. Love how small the pills are. Apparently the blister pack makes a difference? I don’t know why these work so much better. But this is the one you wanna get.

Always on time, love this product!

Great value delivered on time as promised

My symptoms are much worse if I do not take this before my evening meal.

Great SellerArrived just as described, on time, great conditionwill shop with this seller again

Works as described. Arrived on time. 3 stars as would prefer if the lightweight paper box were sealed in an outer package or envelope - weird to receive medication in the mail with no layer of protection. Too easy to tamper with. Box arrived smashed. Luckily the pills were ok.

Very effective histamine blocker

It helps.