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There are currently four theories about the mechanism by which vitamin B12 deficiency causes neurological disorders [87,88,89]: (i) vitamin B12 exists in two active forms, methylcobalamin and adenosylcobalamin

The rubber tip of the plunger that slides inside the barrel is considered sterile

However, some sources indicate that the benzyl alcohol may degrade IGF-1 LR3 structure over time, potentially reducing potency within days to weeks

[16] [121] Investigations into the intestinal absorption of B 12 confirm that the upper limit of absorption per single oral dose is about 1.5 g, with 50% efficiency

Symptoms of Deficiency Fatigue and Weakness Low levels of vitamin B12 can lead to fatigue and weakness