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The critical limitation for both compounds is the same: evidence is preclinical, human clinical data is either minimal (BPC-157) or nonexistent (KPV), and both are sourced through unregulated markets where product quality cannot be guaranteed

European Neurology

Peptides can be relatively short chains of amino acids that can function as signalling molecules, or proteins can be longer chains of amino acids that fold into more intricate shapes that are able to carry out specialised biological functions

In some cases, a bone marrow biopsy may be necessary

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doi: 10.1111/j.1574-6968.1991.tb04345.x 33 KhanS.TndervikA.SlettaH.KlinkenbergG.EmanuelC.OnsyenE.et al