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Description
Ingredients: The active ingredient in this injection is cyanocobalamin at a concentration of 1000 mcg/mL
Acta Physiol (Oxf)

I think it was just my own Dave Tilley: Googling

Nasal sprays may come in fixed concentrations (for example 50 mcg per spray) and may require adjusting number of sprays rather than volume
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B., Chung, Y