should you refrigerate bac water does need to be refrigerated before opening How long do use you Bac water for? : r/Retatrutide Bacteriostatic Water 10ML - Simple
Description
Important : If B12 deficiency is suspected, folic acid should not be started before B12 deficiency is excluded or treated, as this can worsen neurological complications

Chronic conditions impacting absorption include atrophic gastritis or pernicious anaemia, where there is a lack of intrinsic factor, a protein essential for the uptake of B12 in the digestive tract

But you can also use B12 shots for cold and flu symptom relief
But simply raising B12 for everyone may not be the answer

A deficiency means that there isnt enough of something