Even the mainstay of any vitamin regimen, vitamin C, becomes less bioavailable with increased doses, especially above 250 mg.1 For example, taking either 1 or 2 grams of powdered vitamin C will yield similar blood levels, as the majority of vitamin C will pass through the body
Specially, Glu-triggered long-distance [Ca 2+ ] cyt propagation is dramatically inhibited in glr3.3glr3.6 mutant 11
Why it was included in the FDA ban Melanotan II was banned for reported adverse effects like melanoma skin cancers, posterior reversible encephalopathy syndrome (a seizure and headache disorder), sympathomimetic toxidrome (symptoms of poisoning), and priapism (dangerous, prolonged erections)
Zhuang P, et al
In other words, they both help gut healthbut of course, glutamine helps more and does so in a more direct way