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2013 Jun;98(6):2409-14 52d

While vitamin D has long been known for its immune-promoting properties, there is already a very extensive body of data for vitamins A and E, while vitamin K has only recently become the focus of immunological interest in the context of severe respiratory diseases such as COVID-19, and it is clear that extensive research is still needed particularly for the latter vitamin in order to evaluate other previously unnoticed immune functions

More often, it struggles because teams have to make huge decisions with models that may not be predictive enough of what will happen in humans

Lake Titicaca Puno is the worlds highest navigable lake (3,810 meters / 12,500 ft above sea level)