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Standard (5 mg/mL) provides a balanced approach for most research scenarios
If your FDA-approved pen contains liquid that is pink, red, cloudy, or has visible particles, do not use it
In vitro laboratory use only
While there is no scientific evidence recommending against taking B12 at night, because of its role in energy production, it can elicit a stimulatory effect in some people, as do the other B vitamins
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