are b12 injections better in the muscle or fat & Weight Loss: What Evidence Says – Bolt Pharmacy B12 shots for weight loss:

Many patients do not absorb B12 efficiently through food or oral supplements, especially those over 40 or on certain medications like metformin or acid reducers

[41] Hird returned to court in early November 2014, [42] and his appeal was dismissed on 29 January 2015

A low mood that doesn't lift despite doing "all the right things." You start searching for answers, and somewhere between the medical websites and the social media posts, you land on B12 deficiency as a possible explanation

A beginner-friendly way to think about it is this: biohacking is self-optimization with more data and more intention

PMCID: PMC3136748