Vitamins play a key role in the functioning of our bodies, they are the building blocks of our health
Children and adults need 15 mcg of vitamin D
The most comfortable way of doing this is by measuring the methylmalonic acid (MMA) in the urine, which determines how much vitamin B12 the cells actually receive
B12 is also known by the name Cobalamin so don't get confused if you see that term thrown around online

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