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Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight | Scientific Reports
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UV Lamp 'Light Baths' Were Given to Soviet Children in an Attempt to Supply Them with Vitamin D During Winter, 1987 [1800 X 1087] : r/HistoryPorn
Soviet Visuals - UV lamp "lightbaths" were given to Soviet kids in an attempt to supply them with vitamin D during the winter. | Facebook
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