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Vitamin B12, also known as cobalamin, is a water-soluble food that plays an important role in maintaining proper muscle and red blood cell function
Only the math changes
If your body is missing a key nutrient, B12 may make a more noticeable difference
Concentration: community-reported topical serums commonly fall in the ~1-2 mg/mL range (roughly 0.1-0.2%), described for daily scalp application
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