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The vitamin b12 injection is a prescription-only medicine that is widely used by clinicians to treat or prevent vitamin b12 deficiency
However, for studies requiring precise dosing and maximal efficacy, injectable forms usually remain the preferred choice
It does not create any hormonal risks as with full HGH treatments
But it does not cause a direct rise in testosterone levels
doi: 10.1016/s0928-4257(97)89480-6
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