does a b12 injection break your fast Shots: Benefits, Uses, Safety, Cost & How They Work B12 Injections & Weight Loss:

According to the NIH Office of Dietary Supplements, B12 plays a key role in: Making red blood cells and preventing megaloblastic anemia Maintaining healthy nerve function and the myelin sheath that protects nerves DNA synthesis Supporting brain function and preventing cognitive decline Converting food into energy (cellular metabolism) Because B12 is found almost exclusively in animal products meat, fish, dairy, and eggs certain groups of people are at much higher risk of deficiency than others

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Three RCTs met inclusion criteria The trials randomized 153 participants (74 participants to oral vitamin B12 and 79 participants to IM vitamin B 12 )

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Injecting into fat instead of muscle reduces absorption, so the dose may not work as intended