Because they are unable to get it
However, there is more to consider than just taking a B12 supplement
Thymosin alpha-1 is now prescribed worldwide for a variety of conditions involving immune support (long COVID, chronic Lyme, chronic mono, chronic fatigue syndrome, and a host of viral, bacterial, parasitical/fungal/candida infections and even cancer)
It is indicated for treating vitaminB12 deficiency in conditions such as pernicious anemia, dietary deficiency, and malabsorption syndromes, as well as for use in diagnostic procedures like the Schilling test
These compounds help your body break down stored fat more efficiently and convert it into energy rather than allowing it to accumulate
Any website or seller offering B12 vials without a prescription is breaking the law and, frankly, putting your health on the line