Sterile water does not contain preservatives
Individuals with a B12 Deficiency Studies have repeatedly shown that oral B12 tablets are just as effective as shots, for any level of deficiency
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Protocols commonly use subcutaneous injection in a loading-then-maintenance pattern over 46 week blocks, but there is no FDA-approved product or official dosing
If you find yourself vomiting frequently, talk to your doctor
This gives you the evidence you need for a productive discussion with a healthcare provider, armed with facts, not just feelings