Water overdoses can be serious in the worst cases, even fatal.

https://en.wikipedia.org/wiki/Hyperhidrosis

I've heard one of the only things that are safe in any amount is alcohol-free beer. Which leads to some funny images of our medical studies if that was the standard we held.

I doubt it.

Beer is mostly water and your body can literally collapse from to much of it. I made a quick search and I didn't find anything that proves what you're saying.

Yeah, it was a word-of-mouth thing which I didn't care to follow up on. Given that beer has electrolytes and too much water kills by displacing electrolytes, it does seem reasonable to expect you could drink more alcohol-free beer than water though.

While toxic amounts of basically anything are bad, introducing random facts that have no bearing on what is discussed can mislead some readers into thinking you're making a point related to the topic at hand. While it may be unintentional, this is misleading and therefore not helpful.

Look at the context. I was responding to the implication that taking 3 vitamins is categorically safe. It is not.

If your definition of "safe" is so strict that it declares that's not safe, that's fine and your decision, but it's not a definition you can live by. You're not actually holding your actions in your life to that standard, because you can't be. It's fundamentally broken to do risk analysis without considering the possible benefits as well. Otherwise you end up with the answer to literally everything being "It could be harmful", with no countervailing possibilities, and your heuristic says "no" to everything, including doing nothing. You can't live that way.

In any normal sense it is safe.

No one is suggesting an overdose though. In the amount in the study it is harmless.

The study is not suggesting the administration of toxic amounts of vitamin D