Vitamin B12 injection should be administered only under the recommendation and guidance of a medical professional and they should be aware of complete medical history including any conditions such as hypokalemia, polycythemia vera, gout, Lebers disease, iron and/or folic acid deficiency
NAD injections are self-administered in a few seconds
So they switch
The progress photo feature with side-by-side comparison view is useful for visualizing change over time
These processes include gene expression (how our genes behave or express themselves), and DNA synthesis (creating new DNA, which is important for cell growth and repair)
At the end of the day, you need to take a hard look at your own personal situation and see if the risk, however small, is something that you are willing to handle