doi:10.1073/pnas.1209927110
It is being studied for the treatment of type 2 diabetes and obesity
Vitamin B12 is a nutrient that your body doesn't make, so you have to get it from animal products, such as meats, dairy, and eggs, or from supplements
Most antihistamines, such as diphenhydramine (Benadryl) and cetirizine (Zyrtec), are processed by your liver
However, the drawback is that it has a short half-life in the body (ie it doesnt last very long ) so youd need to repeat the expensive procedure, which needs a medical professional to administer it
Some patients may experience a transient increase in acne or rosacea-like skin reactions, thought to be related to the effects of vitamin B12 on skin bacteria, though this is uncommon and typically mild