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The onset of benefits can vary from person to person
The compound is most often taken with meals, as this may improve absorption and reduce the likelihood of gastrointestinal discomfort
How B12 Deficiency Affects Your Metabolism and Energy Now, while B12 doesn't directly cause weight gain, a deficiency can certainly have an indirect impact on your body's energy levels and, consequently, your activity and metabolism
Injectable B12 is often preferred because it bypasses the digestive system and delivers the vitamin directly into the body
More severe side effects include: Advertisement It can be difficult to diagnose vitamin B12 deficiency because you may not have symptoms, or symptoms can be like other nutritional deficiencies