can you take b12 tablets as well as injections How Long Does It for Vitamin to Work? Simple Guide Do You Still Need B12

Complex medical conditions Youre much more likely to need lab work before or during vitamin/IV plans if you have: Chronic kidney disease Significant liver disease A history of bone disease or very low bone density Digestive conditions that affect nutrient absorption A long list of medications that interact with vitamins and minerals In these situations, labs help your provider understand how your body is handling nutrients and guide more precise decisions

This method, typically subcutaneous or intramuscular, often represents the gold standard for achieving high and predictable bioavailability for many peptides and small molecules

2007 Jul;30(7):834-9

OLeary F, Samman S