As prescription only medicines, any promotion of them on social media, for example, falls foul of restrictions in relation to medicine regulations which prohibits the direct or in-direct promotion of a prescription only medicine to the public
Injectable B12 has few direct drug interactions, but certain medications can interfere with B12 absorption or measurement: Chloramphenicol: This antibiotic may antagonise the haematological response to B12 in some patients, potentially preventing the expected rise in red blood cell count
For more information about dietary and supplemental sources of iron, as well as the side effects and safety of iron, see the article on Iron
Timing matters equally in how you space your meals around injections
Although each of these ingredients will benefit you, putting them all together is an excellent way to get a jump on your weight loss journey