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Clinical guidance for intramuscular injections points to a 22 to 25 gauge needle, given at a 90-degree angle, with the length chosen so it reaches muscle without going too deep

In February 2026, the U.S

For comprehensive storage recommendations across all forms, see our peptide shelf life guide

B12 plays a role in how your body processes fats and proteins, so a deficiency can leave you feeling sluggish

One common question that arises is, "How long do the benefits of a vitamin B12 injection last?" The answer can vary from person to person based on factors such as metabolism, overall health, and the severity of B12 deficiency