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Off / washout (after the block): A typical research framing runs a defined block (commonly 812 weeks) followed by an off period before any subsequent block, rather than indefinite continuous use because long-term human data simply do not exist
That is why the date rule exists alongside the visual check rather than instead of it
Vitamin B12 shots are recommended for people who cannot absorb enough through food or oral supplements
In fact, some athletes take supplements of vitamin B12 before big games or competitions
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