how long does it take b12 injections to take effect Quickly Do Shots Work? How Quickly Do B12 Shots

A meta-analysis

Central nervous system control of food intake and body weight

The survey also found that those who self-injected were more likely to report feeling unsafe in primary care and, at times, they felt that they were not treated with dignity and ..the main reasons given were to improve fatigue and TO REDUCE BRAIN FOG and pins and needles. Theres a clue there somewhere

Controlled-release phentermine/topiramate in severely obese adults: a randomized controlled trial (EQUIP)

Intranasal treatment (via a nasal spray) of B12 is also available through a prescription (Andrs, 2018)

Effect of leptin deficiency on metabolic rate in ob/ob mice