Your doctor may determine if you have a deficiency based on your medical history, lab work and signs or symptoms
while the acute repletion might be IV/IM for a period, they may transition to high-dose oral vitamins thereafter
Some observational research has also suggested a slight increase in lung cancer risk linked to long-term, high-dose B6 and B12 supplementation, particularly among men and smokers, although this kind of study cannot prove that the supplements caused the cancers
Stuart (US authors) Some forum members have met health professionals with poor understanding of PA and B12 deficiency Misconceptions about a B12 deficiency (From Dutch B12 website - units, ref ranges, treatment patterns may vary from UK) stichtingb12tekort.nl/engli
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