Early warning signs of Vitamin B12 deficiency often include persistent fatigue and weakness, brain fog, memory and concentration issues, a smooth or sore tongue (glossitis), pale or yellowish skin, and tingling sensations in hands or feet
Giustarini D, Milzani A, Dalle-Donne I, Tsikas D, Rossi R
Now, that name has certain problems that we'll get to in a moment, but
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Thiamine, which is found in a variety of foods of plant and animal origin, is essential for energy metabolism, and its deficiency leads to beriberi
doi:10.1158/1940-6207.CAPR-11-0306