Why is glycine dangerous and does it really help?

prescribed, took, did not notice the effect at all. more like homeopathy or placebo. I do not understand why he is assigned to everyone en masse. like "do no harm"

If no jokes, then: before going to bed, dissolve 1-2 large tablets - you fall asleep well. But this is the effect of this substance or from the satisfaction of the sucking reflex, like in babies, is still unclear.

Helps! increases memory and attention, improves performance, relieves nervous tension. I took a course of effervescent Glycine D3, 1 tablet per day (you need to dissolve in a glass of water). There were no adverse reactions, I did not notice any harm from it) If you need to cheer up and recharge your brain, then feel free to take it.

Glycine is an amino acid, also a neurotransmitter, but as a neurotransmitter it does not just penetrate from the gastrointestinal tract (and even from the mouth, since it usually needs to be absorbed by putting it under the tongue, thus the drug bypasses the gastrointestinal tract and the metabolic transformation phase in the liver entering the bloodstream immediately) to the brain, which makes glycine in the form of tablets no more than a dietary supplement. There is no reliable data on its clinical efficacy, neither on Pabmed, nor in Cochrane, nor in RXlist, and it has been tested in exorbitant dosages, as a result, it is absolutely not used abroad in clinical practice. Special attention should be paid to such a drug as "Glycine Forte", in addition to glycine itself, it also contains vitamins of group B, so it is just dangerous to take it in large doses, since an overdose of the above vitamins threatens with very real effects, but, unfortunately , negative, up to fatty degeneration of the liver, kidney damage, seizures, and so on.