Been taking Testogen XR for roughly 3 months, 7 days on , then a few days off, i train twice a week, but wanted to boost my Testosterone to see any improvements, at first i got the sh!ts, but almost immediately i started to notice better mood, more energy, libido increase, better and quicker brain function..im happy with it. I still eat lean meats and good diet, but for me i feel like i am 25 again.. would be interested to know about the research about aspartic accid causing MS etc …any scientific proof of this, example of people taking it and turning into vegetables, ..if proof could be provided ..for sure id stop using, but for now i feel like a new guy.
While a single NR2 subunit is found in invertebrate organisms, four distinct isoforms of the NR2 subunit are expressed in vertebrates and are referred to with the nomenclature NR2A through NR2D (encoded by GRIN2A , GRIN2B , GRIN2C , GRIN2D ). Strong evidence shows that the genes encoding the NR2 subunits in vertebrates have undergone at least two rounds of gene duplication.  They contain the binding-site for the neurotransmitter glutamate . More importantly, each NR2 subunit has a different intracellular C-terminal domain that can interact with different sets of signalling molecules.  Unlike NR1 subunits, NR2 subunits are expressed differentially across various cell types and control the electrophysiological properties of the NMDA receptor. One particular subunit, NR2B, is mainly present in immature neurons and in extrasynaptic locations, and contains the binding-site for the selective inhibitor ifenprodil .