You usually dont need to conduct clinical trials to sell dietary supplements, sometimes referred to as nutraceuticals. A second loophole involves compounding pharmacies, which are largely regulated by state pharmacy boards
As researchers from Cornell University Medicine stated, Management requires correctly diagnosing cobalamin deficiency, reversing it, defining its underlying causes, preventing relapse, managing the underlying disorder and its complications, and educating the patient. Do You Need B12 Injections
Luckily, theres an exception - Setria Glutathione, a patented form of glutathione that is deliberately made to be easy for the body to absorb
However, the most convincing results about the effect of ascorbate on human health can be obtained from clinical studies (Halliwell 2018)