b12 injections vs oral supplements vitamin tablets injection vs. Supplements: Which is Better? The Advantages of B12 Injections – B12 Injections or Oral B12:

Limited human evidence: Human studies have mainly evaluated safety and metabolic markers

As cells age, mitochondria can become less efficient, leading to a decline in overall cellular function

One review concluded that vitamin B12 plays a key role in fat metabolism, noting that a deficiency could be linked to increased fat accumulation and obesity ( Another animal study found that severe vitamin B12 deficiency led to a significant increase in body fat percentage and cholesterol levels in pregnant mice ( Whats more, one animal study showed that administering B vitamins to rats fed a high fat diet reduced weight gain and increased levels of several enzymes that influence metabolism, compared with a control group ( However, current evidence is lacking, and additional high quality studies are needed to determine how vitamin B12 may affect metabolism and body fat in humans

That growth hormone then has widespread effects, including some fat-burning activity