Initially, main concerns were receptor-activating activity while recently, downstream effects of GLP-1R and GIPR have been more and more revealed that not only receptor activation promotes cAMP and stimulates insulin releasing, but also other factors (-arrestin recruitment, residence time, etc.) influence receptor internalization, which further elicits long-term effects in vivo
In fact, nutrient density has declined steadily in soils since at least the 1950s and our food with it (Thomas, 2007)
Potential issues may include: Underdosed products Poor peptide quality Inconsistent administration Protocols that are too short Concentrations that are too low for the severity of the condition In many situations, the issue may not be that peptides do not work, but rather that the body is not receiving adequate and consistent support for long enough
All studies were randomized, parallel-group, multinational trials sponsored by pharmaceutical industries