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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
You're in a caloric deficit, recovery is impaired
Not entirely
Nervous System Issues : Vitamin B12 injections can sometimes cause nervous system problems, such as numbness or tingling in the hands and feet, muscle weakness, or difficulty walking
B12 injections are an effective method of maintaining healthy levels of B12 in your body
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