So I was perusing the Rhyothemis blog rhyobrain.blogspot.com and stumbled across something concerning "Hcy neurological harm depends on glycine levels" rhyobrain.blogspot.com/2021... which led me to this:
The Controversial Role of Homocysteine in Neurology: From Labs to Clinical Practice 2019 ncbi.nlm.nih.gov/pmc/articl...
"The mechanism of damage evoked for Hcy excitatory role has been found [65,66]: Hcy is an agonist of the endogenous glutamate receptors, NMDA receptors [67,68].
Through Hcy-NMDA binding, Hcy indirectly enhances calcium influx [69]. This is not a constant reaction, and it largely depends in the Glycine concentration; when glycine is in normal concentration (10 μmol/L), Hcy acts as a partial antagonist of the glycine site of the NMDA receptor, and it inhibits the receptor-mediated activity, acting as a neuroprotective factor [23,65]. Therefore, it can be easily demonstrated that when glycine levels are normal, only HHcy could exert a toxic effect (i.e., Hcy = 100 μmol/L).
On the contrary, when glycine levels are higher inside the brain, more than 10 μmol/L, (and this occurs in clinical conditions in different scenario: brain ischemia, head trauma, or even protracted migraine cluster), even a low concentration of Hcy (i.e., Hcy = 10 μmol/L) could be an agonist on NMDA [70,71], exerting an excitatory action, and enhancing calcium influx.
More recent data underlies a new possible mechanism of Hcy’s action: its direct activation of the group I metabotropic glutamate receptors, by competing with inhibitory neurotransmitters, such as GABA [70], inducing also this way an increase of calcium influx. "
I am trying to lower my Homocysteine levels, not add things to my brain that make Homocysteine more successful at damaging my brain.
For now, Glycine is off the stack. Please explain why I am mistaken.
Update: windhorsepixy provided some good counterpoint (and made me remember how well I have been sleeping):
Glycine, the smallest amino acid, confers neuroprotection against d-galactose-induced neurodegeneration and memory impairment by regulating c-Jun N-terminal kinase in the mouse brain 2020 jneuroinflammation.biomedce...
Wow: Conclusion
Our findings demonstrate that Gly-mediated deactivation of the JNK signaling pathway underlies the neuroprotective effect of Gly, which reverses d-gal-induced oxidative stress, apoptotic neurodegeneration, neuroinflammation, synaptic dysfunction, and memory impairment. Therefore, we suggest that Gly (an amino acid) is a safe and promising neurotherapeutic candidate that might be used for age-related neurodegenerative diseases.
Thank you windhorsepixy ! I was really hoping somebody would steer me back to Glycine. You may have done it!