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This will give us a final concentration of 2.5mg/ml (or 2500mcg/ml)

Additionally, B12 is vital for DNA synthesis, cell division, and energy metabolism, helping to reduce fatigue

It is found in saliva, urine, and various tissues and its concentrations in plasma decline with age

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Birkholz, O., Rickert, C., Berger, C., Urbach, R