how to give a b12 injection in arm self-inject intramuscular vitamin - Overview B12 Shot Demonstration & Information

Reddit threads on r/Biohackers describe it landing between weeks 3 and 5 most often

Best Sites to Inject B12

Seek emergency medical attention (call 999) if you experience: Difficulty breathing or swallowing Swelling of the face, lips, tongue, or throat Widespread rash or hives developing rapidly Severe dizziness or feeling faint Chest tightness or wheezing Anaphylaxis to hydroxocobalamin is uncommon but documented in the product information

We recommend that you dose up if your symptoms are extreme which would indicate a severe deficiency

We keep up multiple production batches to make sure there is always a supply, and we have set up emergency supply methods to handle pressing needs well