We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
The thing is that vitamin D is a critical vitamin and when it is missing from the diet has serious impacts. That is why milk, flour and cereal is fortified with it. So it was an easy leap for many people to think and believe that we needed more vitamin D. It was a perfect target for the scammers and snake oil salesmen.
They've lowered the level at what they consider danger for Vitamin D Intoxication. It was 100, it's now 50. My last reading was 56.
120/80 used to be textbook good blood pressure. It's now mild hypertension.
Should we start talking about cholesterol? Seems that people my age (64) with a 240 total and 80 HDL live longer with middle range triglycerides live longer and healthier lives. Doctors have been trying for years to get me to take statins. Turns out statin meta-studies show absolutely zero health benefit for taking them, for most people.
No one is making huge amounts of money on Vitamin D. It's cheap. Niagen I'm sure is cheap to manufacture; the people who hold the patent are making a small fortune. After their patent runs out and it becomes inexpensive, I may start taking it.
There's a temptation to jump from "low Vit. D levels indicate a possibly serious problem" to "taking mega-doses of Vit. D will be effective." Sometimes all we're doing is treating a symptom, but the symptom is benign next to whatever is generating the symptom.
I have all my life been anemic. I was healthy as a horse (was, I'm 75 now and my health is not great) so it never bothered me and no doctor ever followed up on it or told me to take supplements. Recently my oncologist told me that one of the things he was tracking was my anemia and on that particular visit the tests showed it was gone and he was curious. I remembered that a day or two before my lab tests I had cooked a turkey and gorged myself on the liver and other organ tidbits. He agreed that was likely the reason for my normal results.
So since then I buy chicken livers and freeze them a couple to a baggie and try to remember to cook chicken livers in addition to me regular meal a couple times a week. Easy to do, whatever meat I'm cooking I just throw in a couple of chicken livers with them and watch them until they are done and eat them right there at the stove.