doi: 10.1016/j.biopsych.2008.10.011
Environmental factors like UV exposure or pollution accelerate this by inducing more DNA damage, thus more PARP activity
Injection with a separately identifiable E/M: Bill both
Gomez N, Touihri K, Matheeussen V, Mendes Da Costa A, Mahmoudabady M, Mathieu M, Baerts L, Peace A, Lybaert P, Scharpe S, et al: Dipeptidyl peptidase IV inhibition improves cardiorenal function in overpacing-induced heart failure

HMT is present in the cytosol of cells in many tissues including the kidneys, liver, spleen, prostate, ovaries, spinal cord, bronchi, and trachea.[4] HMT is present in the airway tissues which play an important role in degrading histamine and regulating the airway response to histamine.[5] The intermediate products of histamine metabolism via HMT are broken down by the enzymes monoamine oxidase B (MAO B) and aldehyde dehydrogenase (ALDH).1,[6] HMT catalyzes the methylation of histamine in the presence of methyl donors such as S-adenosyl-L-methionine (SAMe).[7] Single nucleotide polymorphisms (SNPs) in any of these enzymes may affect the bodys ability to metabolise and eliminate histamine and the products of its catabolism.[8] Diamine oxidase (DAO), also known as histaminase, is the main enzyme responsible for the metabolism of ingested histamine
If you have any underlying health conditions, you may also find that one medication works better for you than the other