I believe you, not the one study that I read, I believe if they were low and got severe, medicinal doses work. I also now that if you do become sick with normal levels treat it as a medicine 2,000iu per kg until better. Sometimes the body needs extra to calm the storm. I’ve been doing cancer research since the mid 2000’s for my dad at the time, I’ve read thousands of research papers, talked to 100’s of researchers about repurposed drugs that doctors won’t prescribe along with chemo etc, you have to buy them from India and do it yourself. He was the longest living stage 4, 3 months to live cancer patient at that time, he lasted almost 5 years until a mistake, with biologicals he probably isn’t a record holder anymore. Then my nephew got an autoimmune disease and my brother “recruited” me for the same purpose. Same thing, studies, researchers and he’s never done a traditional treatment and is perfectly fine 12 years later. We all take 10,000iu a day, my mom who’s 80 just got whatever is going around. 103.8 fever and 87 oxygen. We hit her with everything and 8 hours later she was back to normal levels. She doesn’t remember three days before hand or the first dat of treatment. She was completely better, lungs cleared by day 3 and on day 10 she was all better and stopped everything. Old people are like toddlers but you can’t hit them. She should’ve went 14 days because she could hardly move but she was “all better”. On day 14 she was finally all better, no pain, aches etc and up and moving around. I believe she had a 65 or 70 vitamin d level when it was check a few months ago. So sometimes it doesn’t matter the level depending on the person, age, how hard it hits you etc. But with the combo we have set up with flccc, the zelnko protocol and every study that’s shown promise and memory hold and have heard of others using it, she made a quick recovery from needing the ER to just rest and taking pills. If taken to the ER she’d be dead. We didn’t give her one cough medicine besides a couple high dose antioxidants that act as expectorants and keep the viral pneumonia away. She coughed everything up by day three and was fine.