It takes something like six to eight weeks for the average person to grow about an inch of hair. The cool thing is that, compared to blood, you have about a thousand times more data per element tested. So it's like surveying a thousand people versus ten people, one person. And what i've really come to believe, after doing this for years, is that we could spot a deficiency years ahead of time,. maybe as much as a decade ahead of time, in hair before we'd see it in blood.

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