is l carnitine bad for you Carnitine: the claims and why it may not work Can L-Carnitine Cause Side Effects?

Its possible to get peptides without a prescription but these, referred to as research-use-only peptides, have not gone through a rigorous safety testing process

42 IndiveriC.IacobazziV.TonazziA.GiangregorioN.InfantinoV.ConvertiniP.et al (2011)

Yang Y., et al

A growing body of evidence points to a relationship between glutathione levels and chronic illnesses such as fibromyalgia, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and multiple chemical sensitivity (MCS)

It is a small peptide made of amino acids and was first studied for its potential relationship to sleep regulation, particularly slow-wave sleep