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It is caused by a combination of genetics and hormones

doi: 10.3390/jcm7100304

It helps to preserve lean muscle while helping you burn fat and increases your metabolism

Description Give your body a natural energy boost with a Vitamin B12 injection and end your reliance on stimulants like coffee and energy drinks

References American Society of Clinical Oncology (ASCO)

While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient