Good suggestion. I had thought about it, but here's why I had decided not to include it.
Decreased MTHFR may cause a reduction in the breakdown of histamine, but if the cause of histamine issues is MTHFR then there's a good chance that addressing the other issues like this product will, will help with that issue as well.
The problem with adding Quercetin to it is that Quercetin ideally needs to be taken on an empty stomach and many people have to take B Vitamins with a meal. I did think about adding it, but that, along with that it would add a number of capsules to the product is why I had decided not to.
Histamine intolerance is contributed to or caused by other genes and issues as well. I have issues with histamine intolerance myself, and we will be doing a product to help target that later in the year. It's one that is very novel and unique, so I can't really give out any info on that now. I'm normally not very secretive about upcoming products or ideas I'm researching, but this project is special to me and I've been researching concepts for this for years and its a collaboration between myself, a dermatologist, and an allergy specialist, so it will be super cool.