The effects generally last between 1 and 4 weeks, depending on your bodys metabolism, B12 usage, and the severity of the deficiency
(NCD-RisC)
An oral supplement has to travel through your digestive tract, survive stomach acid, bind to a protein called intrinsic factor, and be absorbed in the small intestine
Symptoms of deficiency include fatigue, weakness, neurological problems (such as paraesthesia, balance difficulties, and cognitive impairment), and megaloblastic anaemia
However, markedly elevated levels without supplementation may warrant GP review to exclude underlying conditions such as haematological disorders, liver disease, or renal impairment
The exact volume depends on your research protocol see our reconstitution calculator guide for dilution mathematics