Sunlight fundamentally consists of three wavelengths: UVA, UVB, and UVC. Earth's ozone layer separates and holds the most damaging UVC rays.  People with low levels of vitamin D in their blood have much higher incidences of practically all diseases and sickness: cancer, diabetes, obesity, osteoporosis, heart attack, stroke, depression, cognitive impairment, autoimmune conditions, and so on

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