b12 injections side effects weight gain If you have a low vitamin level, can go a long way toward improving your health and well-being. But if your B12 level is normal, don't fall for claims that Vitamin B12 Deficiency and Weight

So, we recommend using SL vitamin B12 rather than oral and IM, especially in patients who do not tolerate IM injection and patients who need prolonged vitamin B12 supplementation, such as patients with long-term metformin use and patients with pernicious anemia or with gastro-duodenal resection [51,52,53,54]

Others have side effects that are so bad they aren't worth considering

Vitamin B12 Injections Vitamin B12 is an essential nutrient that plays a critical role in the health of your brain, nerves, and blood cells

K.SwaminathanS.et al (2018)

That is exactly what the gray market lacks, and the savings are not worth the gamble

decades of human data confirm a clean side effect profile