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Now, lets state some facts: we are trying to recruit people to take part in a research project who manage perfectly well on their three-monthly regime
Trade-offs include less flexibility in dose adjustment and prolonged exposure if adverse effects develop
B12 from food and supplements has to pass through a fairly involved process in the stomach and gut before your body can use it, and that process becomes less efficient with age, with certain medications, and with diets that include little or no animal protein
Stress management plays a role too
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