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Urine might be a darker yellow if youre dehydrated, as it contains more waste products
Vitamin supplementation is for wellness only, and not intended to cure or treat disease
The 250 to 500 mcg range is an educated estimate, not a clinically validated dose
However, there are certain conditions in which vitamin B12 cannot be absorbed, for example, due to dietary insufficiency, malabsorption, or lack of intrinsic factor, hepatic stores are depleted, and deficiency ensues
Theyll ask you about your diet, general health, meds you take, and how often you have bowel movements
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