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Signs of deficiency The following symptoms may be a sign of B12 deficiency: extreme tiredness lack of energy pins and needles sensation muscle weakness depression and cognitive problems such as impaired memory, understanding and judgement A lack of B12 can lead to a raised level of the amino acid homocysteine in the blood which has been linked to heart disease

Zimmern et al., 2022)

Gut-focused patients often feel a calming effect sooner, within the first 2 to 4 weeks

But for commercial claims, checking the payers fee schedule or provider manual can mean the difference between proper payment and a preventable rejection