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Chronic Fatigue Syndrome

  • Polarised light micrograph of crystals of vitamin D. Magnification x35 at 6x7cm size. It resembles an abstract oil painting, with various shades of blue shot through with yellow and hints of violet.
    Bioscience-Medicine
    The late-winter deficiency that could be making you sick and miserable
    Bonnie Petrie
    In March, around 90% of Americans are deficient in vitamin D, which has been linked to serious physical and mental health challenges. What is vitamin D? How do you get it? What can happen if you don't get enough? What is enough? TPR's Bonnie Petrie talks about her own March madness with a Boston University doctor who has been studying this chemical — that isn't actually a vitamin — for decades.