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I'm looking for better research on the process of mobilization of B12 from liver stores - in some textbooks it has been described as "not well understood" so it seems to me this is an open question

At this concentration, 0.25mg equals 0.125ml (12.5 units on an insulin syringe)

Women who participated in the paid labor force have lower rates of memory decline: Working to remember

Once the needle is in the muscle, the plunger should be pulled back slightly to ensure the needle is not in a blood vessel

Also the NHS, the UK healthcare system, mentions that both B12 deficiency and folate deficiency are affecting around 1 in 10 people aged 75 or over and 1 in 20 people aged 65 to 74