I was just browsing a search engine and found this info on lots of sites, that people with high histamine, or "Histadelia" should avoid b12 and folic acid. Anyways my nasal allergies have been terrible for the last few days, nose clogging at nighttime, (housebound right now, so have not been outdoors no outdoor allergy exposure) and I just re-started taking the Methylfolate and MethylB12. Now it could be a complete coincidence but I was just wondering if increased allery symptoms have been seen in other people? Is it temporary- like my body trying to get rid of excess histamine? If this is the case, is there anything I do to help? Already taking antihistamines and nasal allergy spray. Thanks.