It may be that people with low Vitamin D are low because of a combination of their skin tone and the amount of sunlight they get. This causes them to also be l

It may be that people with low Vitamin D are low because of a combination of their skin tone and the amount of sunlight they get. This causes them to also be low on Nitric Oxide. You see the low Vitamin D as a marker, but it might not be the true cause. The shelter in place is causing people to get less sunlight, so until we know more, I'd focus on getting more sun.