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Blood tests can confirm deficiency, but even people with normal lab results sometimes benefit from Methyl B12 due to poor absorption or methylation

You Have Absorption Issues Some people have trouble properly absorbing vitamin B12 from foods and oral supplements due to digestive disorders like celiac disease or Crohns disease

This means that the concentration of B12 dropped by half within that time

Common side effects Injection-site reactions: mild redness, tenderness, swelling, occasional bruising - usually resolve within hours Skin flushing / warmth - brief, related to vasodilation Transient fatigue in the first 12 weeks of intensive protocols Mild headache - usually dose-related Higher-dose theoretical concerns Copper accumulation - each 2 mg injection adds roughly 0.03 mg of elemental copper, trivial next to the 0.92.2 mg from a normal diet