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Symptoms of B12 deficiency can appear in years because the body naturally stores the vitamin in the liver

Shorten the cycle if: results have plateaued for 2+ weeks despite dose optimization, you are experiencing fatigue or other signs of potential receptor desensitization, or your goals have been achieved before the planned cycle end

Relying on any single metric can be misleading

Although your vials might have dark amber glass instead of clear glass protecting them, it is still necessary to protect the nutrients contained inside by shielding B-vitamins from all light

Not having enough can cause serious problems like nerve damage and memory issues