this really doesn't matter much but my friend has MCAD and tried quercetin and she said it didn't help at all.  Everyone is different though.  I would love to use natural supplements but I'm not in that position.  I have 2 little ones and I need to be better now and not later after experimenting forever.  Hope something you try helps.  Timed release vitamin C according to Dr. Afrin can help as well.

Godsgal,
What is the target symptom that increasing vitamin c is supposed to help? What dose is recommeded?

Just keep in mind just like medications no vitamin is the same. Quercertin can come from all sorts of sources. I'm not on quercertin at the moment I was trialing a brand but just did not have enough stability in symptoms to be sure it wasn't triggering me. My trust would be in Dr Theo for sure, I was leary of his if I recall because it had chamomile in it. That's an allergy for me. A lot of herbs are just pollen weeds to my system! Vitamin C is thought to help stabilize mast cells too.  Look up Dr Theos research on quercertin he's done a lot. The neat thing with his algonot was the "mix" leutin along with quercertin and the ability to stabilize mast cells. Again we are all different. Be careful with chondrotin sulfate if you have food triggers, you are looking at a lot of sorces there, pork, bovine, fish, shark. I'm so done ever trying chondrotins/glucosamine/etc.!

Just looked at Dr. Theo's formula the Neuroprotect one and saw some reviews on amazon that were positive.  It has the supplements you were looking for as mentioned quercetin, rutin, etc.  I would look at that.  It's not too expensive.  I'm thinking of trying it myself.

In addition to vitamin C, there's some evidence that vitamins D3, B6 (pyroxidine), and E can help people like us:

http://www.jhoonline.org/content/pdf/1756-8722-4-10.pdf
http://www.ncbi.nlm.nih.gov/pubmed/21244748

I also recently learned that dehydration stimulates your brain to release histamine (causing headaches, changes in mood, etc...):

http://www.ncbi.nlm.nih.gov/pubmed/7720668
http://www.ncbi.nlm.nih.gov/pubmed/8033816

So... you might find it helpful to drink enough water and supplement with electrolytes (sodium, potassium, magnesium, etc...).  I'm starting to train for a marathon (I can still hardly believe it!) and I've found that it's very important to add electrolyte tablets to my water, take "salt" capsules, and use energy gels.

Other people have given you some good cautions, but I'd like to add one: if you've had problems with bleeding (nose bleeds, petecheiae, easy bruising) due to your mast cell disorder, I would steer clear of supplements that have blood thinning properties... vitamin E, fish oil, turmeric, garlic, flax oil, quercetin, bromelain, etc...  In fact, I feel better taking vitamin K, which is one of the few supplements that promotes coagulation  Otherwise, I've definitely found that vitamins D3 (4,000iu per day), C (1g per day), and B6 (100mg per day) help prevent symptoms.

Heather