Several recent double-blind trials have found that this herb has no advantage over placebo for treating colds. |
The study was a prospective, randomized, placebo-controlled, double-blind crossover trial in healthy volunteers. |
And it isn't clear how much of that research would meet the gold standard in clinical research, the controlled, randomised, double-blind trial. |
The five-week trial was a randomized, double-blind, placebo-controlled, crossover study. |
If a curative effect doesn't show up in double-blind tests, then you're mainly talking about the placebo effect, in any case. |
I am only interested in proper double-blind tests, as I pointed out to you in our previous correspondence. |