(There might be exceptions, such as during loading doses, and the odd person who gets more frequent injections.) Second, there is absolutely NOTHING in the legislation (which I quoted here recently) that states or implies a quantity limit
Opened bac water usually follows a 28-day window unless the label states another period, and that opened-vial window never extends beyond the original expiry
Instead of relying on oral supplements that may not absorb properly, B12 injections deliver nutrients directly into your system for better results
At Bhumibol Adulyadej Hospital, directorate of medical service, Royal Thai Air Force, a tertiary training hospital in Thailand, DDAVP is only used when serum sodium tends to increase beyond the limited range (reactive) or in cases of overcorrection (rescue)
What are these, and how can the problem arise in the first place
NHS approach to B12 deficiency: NICE Clinical Knowledge Summaries recommend investigating B12 deficiency in patients presenting with macrocytic anaemia, unexplained neurological symptoms, or risk factors including pernicious anaemia, gastrectomy, malabsorption disorders, metformin use, proton pump inhibitors, or nitrous oxide exposure