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A qualified healthcare professional can properly diagnose a deficiency, rule out other causes of fatigue, and recommend the most appropriate form and dosage of B12, or indeed, direct you towards different treatments entirely
& Kelley, A
Objective measurements More quantitative approaches include: Bloodwork: Tracking relevant biomarkers before, during, and after protocols
See below for more on whether non-deficient folks should consider B12 shots to improve their energy
Morton RW, Murphy KT, McKellar SR, et al
Does the stack have a proven optimal ratio
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