Apologies, i should have explained a little. But i don't have the mental capacity to do so in my own words at this point.
This podcast episode and its notes are a compendium on glycine. 2:43 to 8:28 are the cliff notes.
https://chrismasterjohnphd.substack.com/p/049-why-you-need-glycine-a-panel
He does recommend taking collagen as a means to get glycine in but glycine is just more affordable.