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The biological half-life of pyridoxal phosphate is about 15 - 25 days with an elimination half-life of approximately 3 hours
The Complete Guide to B12 Shots Rebekah Jun 4, 2025 12 min read Updated: Nov 3, 2025 B12 shots are injectable forms of vitamin B12 (cobalamin) administered directly into muscle tissue, typically in the arm or thigh
Vitamin B12 Injections: How They Work Vitamin B12 injections are typically administered through a shot, usually into the muscle, although they can also be given subcutaneously (under the skin)
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