> I believe there's a lot of evidence that many people are deficient in vitamin D. This brings up something I always wonder when these things come up. I agree

> I believe there's a lot of evidence that many people are deficient in vitamin D. This brings up something I always wonder when these things come up. I agree with what you said, and there's a lot of evidence that this is bad. But I've seen mixed results over time as to whether or not vitamin d supplementation has a beneficial effect. I assume it's an "it depends on the effect" and sometimes yes and sometimes no