N-acetyl-cysteine, a drug that enhances the endogenous activation of group-II metabotropic glutamate receptors, inhibits nociceptive transmission in humans
But, quite a few other cell types, can and do, make carnosine, including the kidneys, where the carnosine is nephro-protective
What If My Symptoms Return on the Monthly Schedule
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Some potential side effects include redness or pain at the injection site, nausea, headache, or diarrhea