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Thats where B12 injections come in
Basically a study looked at 100 drugs & found that 90% of them were fully potent 15 years after their expiration date, though that may vary by drug, and perhaps liquid forms are a bit more vulnerable (perhaps)
Insert the needle at 90 degrees if youre injecting into the muscle
I just dont get why this has happened as I have been self injecting B12 every month no problem for a long time until now, although I have had similar problems in the past when trying to get my levels right (that I have posted about on here)
Deficiency is widespread in the UK due to limited sunlight exposure, and is particularly prevalent in those with chronic illness, darker skin tones, or conditions affecting fat absorption