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This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged
While it might initially make us drowsy (sometimes to the point of dozing off in that comfy couch spot weve parked in for the night, or even on the train ride home), its actually a sleep saboteur
Prepare smaller batches if your protocol allows some users report reduced efficacy after 2 weeks
Each injection is prepared in our sterile medical environment following strict protocols
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