This is because they have different active ingredients and mechanisms of action
Although cyanocobalamin is more readily absorbed, much of it is excreted through the urine before it can reach the cells Cyanocobalamin vs Hydroxocobalamin In comparison to hydroxocobalamin, cyanocobalamin has a significantly worse absorption rate and storability, which is why today mostly hydroxocobalamin is used in B12 injections
Not a Standalone Solution: L-carnitine is not a standalone solution for achieving fitness or weight loss goals
Reprogrammed transsulfuration promotes basal-like breast tumor progression via realigning cellular cysteine persulfidation
Endothelial injury generated directly by intracellular viral replication and by ACE2 downregulation, exposing cells to angiotensin II in the absence of the modulator effects of angiotensin 17 (270, 271), and vascular chronic inflammation promoting the development of tissue macrophages overloaded by cholesterol (foam cells), both increase the possibility of acquiring a severe COVID-19 infection (170, 209, 258, 259, 272, 273)
For gut or systemic use, lower, consistent doses often work better than aggressive cycling