More Vitamin D studies than total of Omega-3 and Vitamins A, C, E, K – as of 2021

In PubMed title through 2021

Vitamin D 2979
Vitamin A 261
Vitamin C 452
Vitamin E 361
Vitamin K 385
Omega-3 994

Similar situation in 2015

Image from our video Does Less Sun mean More Disease

Vitamin D is also the #1 selling supplement in most countries

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