The choice of diluent depends on the study: sterile water is common for single-session work, while bacteriostatic water, which contains a small amount of benzyl alcohol, is often preferred when a solution will be drawn from over several days
Differential changes in free and total insulin-like growth factor I after major, elective abdominal surgery: the possible role of insulin-like growth factor-binding protein-3 proteolysis
Nature 370 , 223226 (1994)
In humans, cyanocobalamin must undergo intracellular enzymatic conversion to the active coenzyme formsmethylcobalamin and adenosylcobalaminwhich, depending on the pH environment, can interconvert with hydroxocobalamin (Gherasim et al., 2013), the most common B12 form in both food and human plasma (Obeid et al., 2015)