Personal Monitors for vitamin D and serotonin

Like the portable blood sugar monitors used by diabetics, create a portable monitor for vitamin D and serotonin.  Though there are no meds (just diet & exercise) to lower insulin, also test for insulin.

  This is a prediction:
I actually have more confidence of this appearing by 2016. The prediction is that a portable vitamin D sensor device will be invented. It will allow people to have their blood levels of vitamin D tested within two minutes, with either a tiny blood draw (such as with diabetic blood glucose testers) or, even better, a laser or infra-red detection technology that's non-invasive. The widespread use of such devices could revolutionize health by pinpointing people who are deficient in vitamin D. A deficiency, as you probably know, causes cancer, diabetes, obesity, heart disease, depression, osteoporosis and many other diseases. 

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2011.11
USA Today newspaper insert.