does b12 injection cause weight gain How Affect Loss? Why do I feel worse

Yes, it can

Side effects are uncommon and typically mild, such as brief tenderness or redness at the injection site

Because of this, B vitamins are generally nontoxic, with very little risk of causing harm

Memory or comprehension issues

The result is a significant boost in intracellular NAD+ levels, which in turn activates sirtuins (SIRT1) proteins known to regulate cellular health and metabolism

Now, I opt to get it through other sources: Vega Complete Plant Based Protein Powder Vitamin B complex, which is going to give you all the variations (again with pills quality is HUGE!) From all of my research, this is actually pretty normal