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Avoid repeated freeze-thaw cycles to maintain peptide integrity

Tingling or numbness in hands and feet B12 is essential for nerve health

Although B12 is water-soluble, it differs from most other water-soluble vitamins in that it is significantly stored in the liver

How long B12 shots take to work depends on your B12 levels when you receive the injection, but you can expect to see improved energy, mental clarity, sleep, and other benefits anywhere from 12-48 hours after treatment

That preservative is the entire reason you can open one vial, draw from it, and return to it over the following weeks instead of discarding it after a single use