Signs of low B12 levels can include [8]: Muscle weakness Fatigue Nausea Numbness and tingling in the extremities Diarrhea Increased heart rate Weight loss According to the National Institutes of Health, there is no risk in taking more than the recommended amount of vitamin B12 [2]
Unlike oral supplements, B12 injections bypass the digestive system and are absorbed directly into the bloodstream, ensuring maximum effectiveness
While oral supplements can be effective for some, they may not provide the quick boost or high absorption rates needed for people with more significant deficiencies
Taking too much can cause side effects like nausea, headache, dizziness, and, in some cases allergic reactions
While some are good for several weeks or even months after opening, others must be used within a few days max
Moreover, addressing B12 deficiency has shown promise in reducing symptoms, as supplementation can potentially stabilize mood and decrease anxiety levels