Tiredness, stress, ill-health, poor or limited diet will all reduce this absorption further. For some people, taking a vitamin B12 supplement is one of the easiest ways to maintain healthy levels
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This complex process means that conditions affecting the stomach or intestines can significantly impair B12 absorption, including pernicious anaemia, atrophic gastritis, previous gastric surgery, coeliac disease, Crohn's disease, and long-term use of certain medications (such as metformin, proton pump inhibitors, and H2 antagonists)
Biotin is also involved in the maintenance of healthy hair, skin and nails