l-theanine glutathione L-GLUTATHIONE – Research Peptide L-Theanine by Healthwise – Supplement

Effect of alendronate and MK-677 (a growth hormone secretagogue), individually and in combination, on markers of bone turnover and bone mineral density in postmenopausal osteoporotic women

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But their experience is most likely due to the placebo effect instead of the peptides themselves: Research linking GH supplements with better sleep shows it helps only in the case of people with a true GH deficiency

Nature Communications , 4 , 2516

It is also important for the normal function and development of the brain and the nerve cells