> safe to discount any study that indicates significant health effects from a nonessential amino acid

One, that’s too much confidence for a topic we do not understand well. Two, the study found—with startlingly high confidence and a meaningful, if small, effect size—glycine “can mitigate methionine toxicity,” the latter being an essential amino acid [1].

[1] https://pubmed.ncbi.nlm.nih.gov/30916479/

Well the research is on rats. not to mention that the glycine specific one is funded by a glycine selling company. But despite all that, glycine has strong research backing it especially for reducing inflammation and allergies.

You know SALT is considered bad for you at high doses right?