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Of course it is possible to give a randomized portion of subjects additional vitamin D and the rest a placebo and see if one portion is less likely to develop a

Of course it is possible to give a randomized portion of subjects additional vitamin D and the rest a placebo and see if one portion is less likely to develop a disease than the other.

s1artibartfast 4y ago
Of course, which is the point that I am making as well as the grandparent post. Studies which have not done this should be taken with a grain of salt.