I somehow agree with all three of you. :)

1. Can you overdose on D? Well of course you can.
2. Is it likely you will manage to do that with over-the-counter tablets? No. Not unless you are eating half a bottle a day. :)

I think if my tinfoil hat is on correctly, "they" constantly mention the threat of ODing to scare people away from supplementing with D. Because they are ghouls who want you dead.

So take ~10,000 IU a day of good (non-China) Vitamin D, get out in the sunshine between 10PM and 3PM for ~30 mins a day, get yourself tested to know your level, and try to eat some oily fish and eggs as much as you can.