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Absorption Challenges: Pernicious Anemia and Dietary Factors While some individuals may experience B12 deficiency due to dietary choices, others face challenges in absorbing the vitamin

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For larger vials you can use up to 5 mL more bac water makes microdosing easier, but insulin needles usually max out at 1 mL per injection

[37] Natural plant and algae sources of vitamin B 12 include fermented plant foods such as tempeh [86] [87] and seaweed-derived foods such as nori and laverbread

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Vitamin B12 in health and disease