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Lack of vitamin B12 can result in anemia, stomach problems, and nerve damage

Vogel G, Couzin-Frankel J

Vitamin B12 plays a vital role in hair growth

Data that remained non-normally distributed and/or heteroscedastic after log transformation were analyzed (not log-transformed, but still 1e13-transformed) with a KruskalWallis test, while normally distributed and homoscedastic data were analyzed with a one-way ANOVA, performed on the log-transformed data as necessary

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Some people, particularly those who were severely deficient, report a sudden improvement in energy, focus, or mood within 24 to 72 hours