HNMT

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HNMT controls histamine levels in the brain and airways. The stimulatory activity of histamine in the brain may benefit memory and concentration, however, it can also negatively affect sleep and cause allergy-type symptoms. Genetic variants cause up to a five-fold decrease in HNMT activity resulting in symptoms such as headaches, watery, itchy eyes and nose, coughing, wheezing, shortness of breath, insomnia, and anxiety.

When looking at your HNMT genotype, it is important to consider your methylation profile too by looking at your MTHFR SNP.