Vitamin B12 shots are administered most often in those with genetic conditions that block absorption and people with the disorder called pernicious anemia, which can result in severe malabsorption and deficiency
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"Dietary Reference Intakes for Japanese 2010: Water-Soluble Vitamins" Journal of Nutritional Science and Vitaminology 2013(59):S67S82
Not available in: AL, AR, CA, HI, ID, IA, KS, LA, MI, MS, MT, NE, NV, NC, OR, RI, TX, WV Formula : Methionine 15mg, Inositol 50mg, Choline 12.5mg, Thiamine 30mg, Riboflavin-5-Phosphate 5mg, Niacinamide 30mg, Pyridoxine 5mg, Dexpanthenol 2.5mg, 5-methyltetrahydrofolate (MTHF) 5mg, Methylcobalamin 300mcg, Sodium Ascorbate 15mg, L-Carnitine 50mg, Chromium 0.09, Lidocaine 10mg per mL
Three reasons can cause deficiency, inadequate intake, inadequate bioavailability, or malabsorption