HistDAO - DAO Enzyme Supplement for Digestive Health Support* - Diamine Oxidase from Pig Kidney Extract - 20,000 HDU Per Serving - Gluten-Free & Dairy-Free - 60 Tablets

Really happy with the quality and price. They are very tiny pills in a blisterpack. I just cut a section out of the blisterpack to keep in my wallet so I can use them as-needed when I'm not home. I have to take these almost daily and they're a life-saver for me. When my lips swell due to increased gut histamine, these take care of it. (I have never had a full anaphylactic reaction, so I am not recommending these for that, which would require medical attention). But I am saying that these help manage my histamines so I can enjoy more foods. I usually take these right before or during eating a meal that has caused my lips to slightly swell. I have no other obvious symptoms of high histamines. I also take a daily antihistamine on top of taking these as-needed.

This product specifically was recommended by my allergist for histamine intolerance. I take it with famotidine and the combination has completely eliminated my terrible acid reflux that I had long ago just accepted I would always have. I've tried other brands when short on cash, but this one does seem to work best.

This product is a big help. My wife was diagnosed with BHD. She doesn't product DAO at all? or enough of it - this helps her digest food more easily. When you can digest - everything improves. Good quality, Arrives on time. Regular subscriber.

Magic! This is a high quality DAO, seems to be the one that works more often than others, with lasting positive impact.

We didn't know our teen had histamine intolerance. Her new doctor (internist and microbiota specialist) recommended HistDAO and it is really helping her! The pills are really really tiny and easy to swallow. Always go to your doctor before using supplements, etc. The price is fair.

Excellent product. I have a bad histamine intolerance. I have tried other products and they didn't work as well as this one. This one had no side effects for me.

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.

Works well but do follow the instructions by taking only one, if you take another you'll most likely end up on the toilet lol. 4 stars because this product is not affordable.