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First, it is an endogenous molecule: it circulates in human plasma at a concentration of roughly 200 ng/mL around age 20, declining to about 80 ng/mL by age 60, a fall that has been linked, at least associatively, to the general decline in tissue regenerative capacity with age

doi: 10.1016/j.cmet.2018.03.001

While that initial boost is great, the real goal is to maintain your B12 levels over time so you can enjoy sustained energy and focus without the ups and downs

Who Are Good Candidates

Why Its Important (For Real, Though) You might think clinical research is some distant thing that happens in a giant skyscraper in another country