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The other benefits of vitamin B12 include the following: Improved metabolism Higher energy levels Better concentration Easier weight loss Enhanced immune system Accelerated hair growth Vitamin B12 Deficiency The best approach to tell if someone is vitamin B12 deficient is not to measure vitamin B12 levels in the blood because some deficient individuals can have regular vitamin B12 levels

As with most things, the key lies in the context

Sixty patients aged 65 and older were randomly assigned to either a loading dose regimen (daily administration for 14 days followed by weekly doses) or a regimen without a loading dose (administration every 3 days) over 90 days