It's frustrating that when this comes up, this comment is always the top one, because it's not true.
We have dozens of RCTs suggesting that vitamin D supplementation prevents respiratory infections[1]. There is a very good chance people could mitigate C19 risk with supplementation.
And I personally trust the vast majority of people to use reasonable enough dosing that overdose is unlikely, especially with appropriate messaging.
Downplaying the risks of low vitamin D (way more prevalent than vitmain D toxicity) seems as dangerous as the early pandemic messaging in the US that masks are ineffective.