Case Study: How a Kosher Supplement Brand Settled the D3 vs D2 Debate Since 1964
https://ace-wiki.win/index.php/Case_Study:_Choosing_a_Prenatal_Vitamin_%E2%80%94_My_Zahler_Review_and_the_Kosher_Option
How vitamin D supply chains and kosher rules converged after 1964 In the mid-20th century, vitamin D moved from lab curiosity to household staple