I don't remember. It's the famous study with the soldiers in training in arctic climates, etc. It showed that amongst the normal population there was no benefit. Still, I do think the dose was low.
My point was just that the study had no effect in the normal, unstressed population. But that is like taking a healthy person who isn't sick and then saying, "Vitamin C doesn't help people who aren't sick recover any faster." No kidding.
But then that same study did find benefit in the population that was actually under stress and in a position to get sick from the situation they were in. But we discount that because, "Well, they were working hard and typical people don't do that."
In other words, even the studies that find there is no benefit often find a benefit.
The real shame here is that the DOCTORS will fight its use. You could know all about it, show up in the ER with a respiratory issue and INSIST they give you IV Vitamin C and they wouldn't give it to you. All the more reason, IMO, to get as much in your system now before you end up in the ER - you aren't going to get any while you are there. Your best bet is to have it in tow when you show up (although it won't stay in your system long).
I went through this last fall with my 92 year old grandmother. For 18 months I was saying that her constant use of 2-3 grams of acetaminophen/day would lead to liver failure and that we should give her 2-3 grams of NAC daily with the Tylenol to combat it. They thought I was crazy and gave her 1/3 the dose to keep me quiet. At the end of 18 months, she suddenly had liver failure. The Dr's response was to take her off EVERYTHING, including the NAC. I had a stockpile of pills, literally, 20 feet away from her ready to go just for this situation, which I predicted was coming.
The doctor INSISTED it wasn't acetaminophen poisoning and when I asked her if this was the most common cause of liver failure, she flat out denied it. Nothing I could do, my aunt who was in charge chose to listen to the Dr. My grandmother was old and in tough shape so it may have been for the best that way anyway, but it really highlights how you can't get care, even when it has been standard treatment since the 70's as an antidote for your problem.