Because vitamin D is inexpensive a solves a wide range of health problems, drug companies are trying to make synthetic patentable and high-profit forms of vitamin D. They will ignore and attack vitamin D until they can make a synthetic modification of it that they can then sell as a high-profit prescription drug—this is exactly what they have already done with fish oil.* https://healthythinking.substack.com/p/chemically-altered-synthetic-high