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Urinary or plasma methylmalonic acid (MMA), a substance produced in the body thats dependent on B12, is also helpful for detecting early stages of B12 deficiency
Its important to note that if your B12 levels are already normal, additional injections are unlikely to provide extra benefits
Cognitive issues like memory loss, difficulty concentrating, or mood swings may also indicate a deficiency
No published study has tested this split approach directly, but the pharmacological logic holds: maximize both local concentration and systemic delivery
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