This isnt just a hunch
Vitamin B12 requirements are generally lower and may increase during pregnancy or in cases of malabsorption
Even respected medical journals published concerns about non-equivalent formulations, rarely noting that 503B facilities must follow FDA cGMP standards and source ingredients from registered suppliers
Conversely, in a recent randomized, double-blind, placebo-controlled study involving twenty healthy volunteers, a once-weekly injection of a GLP-1R agonist, dulaglutide, for three weeks did not influence HPA axis activity, showing no significant effects on circadian rhythms of blood or salivary cortisol secretion, and the level of this hormone also was not changed after the dexamethasone suppression test in comparison with the placebo-receiving group [78]
Studies which make use of phosphocreatinine/creatinine for this purpose may suffer from methodological error given the reported negative association between creatinine levels and depression scores (Faulkner et al
Moreover, while MT typically regulates survival signaling and tumor progression through its G protein-coupled membrane receptors, MTNR1A and MTNR1B [4], our findings suggest a receptor-specific effect