If you are pregnant, nursing, trying to conceive, taking any medications, or have a medical condition, please consult your healthcare practitioner before using this product
The pen format changes nothing about that and is merely a product format for the laboratory context
Andrade et al, 2017
W.ChenH
Rotator cuff injuries are generally broken down into two categories: Acute injuries happen suddenly, often as a result of a fall, sudden impact, or unnatural extension or twisting of the arm around the shoulder
However, "unlike most other vitamins, B12 is stored in substantial amounts, mainly in the liver, until it is needed by the body," according to Merck Manuals Consumer Version