Sufficient levels of vitamin B12 in the body help to increase energy levels, and overall brain function, support a healthy metabolism, encourage better moods, and even support weight loss
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Some individuals simply do not tolerate certain compounds well
In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet
How long should injection-site reactions last before I worry
While B12 is involved in metabolism and energy production, there is limited evidence to support its use as a weight-loss aid alone