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Most adults can safely get weekly injections indefinitely

Choi KS, Cohn MJ, Harfe BD: Identification of nucleus pulposus precursor cells and notochordal remnants in the mouse: implications for disk degeneration and chordoma formation

If reconstituted in plain sterile water without preservative, the solution should ideally be aliquoted into single-use volumes and used within 48-72 hours refrigerated, or frozen at -20C for extended storage up to several weeks

For a researcher, this means the three compounds answer different questions

Better Brain Function: B12 is important for maintaining healthy nerve cells and is involved in neurotransmitter signaling