A glass of fortified milk (only full-fat milk is commonly fortified, this is something parents tend to avoid due to the FDA fat paranoia) is only 10% of vitamin

A glass of fortified milk (only full-fat milk is commonly fortified, this is something parents tend to avoid due to the FDA fat paranoia) is only 10% of vitamin D needed per day. And it's not clear if that dose is actually sufficient even in the unlikely event that 10 glasses of milk are consumed. I, for example, take 2000 IU of vitamin D daily and my bloodwork shows vitamin D smack dab in the middle of the "normal" range. According to Kaiser Permanente this "indicates supplementation", which tells me that this "normal" vitamin D is actually not normal at all, and most people are deficient. Coincidentally I do believe I had COVID in March of this year. My only symptom was the loss of smell and taste for a couple of days. Not even a fever. I didn't pay much attention to it, since these symptoms weren't known at the time. This is anecdata though, so it doesn't really mean anything.