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The skin tone is expected to be even due to vitamin B12s role in regulating melanin
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Daily Intake of 4 to 7 g Dietary Vitamin B-12 Is Associated with Steady Concentrations of Vitamin B-12-related Biomarkers in a Healthy Young Population. American Journal of Clinical Nutrition 91.3 (2010): 571-77
Reward: The risk of ruining your research is not worth the minimal cost of a new vial
Just remember that each additional needle puncture increases contamination risk
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