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The Reaction: The solution causes the walls of the vein to stick together and shrink

While often mild and self-limiting, it causes some users to discontinue therapy or struggle with dose escalation

According to the NIH Office of Dietary Supplements, vitamin B12 is available as cyanocobalamin and hydroxocobalamin, which are typically administered parenterally by intramuscular injection to bypass gastrointestinal absorption barriers

Pay attention to signs of a possible infection, such as worsening pain, warmth, or pus, or the symptoms of an allergic reaction, like hives, difficulty breathing, or swelling of the face and throat