If, let’s say for sake of argument, this study’s hypothesis is that the effect is caused by pheromones, then by definition it’s odorless.
In fact, one of the inherent challenges of trying to study this effect between humans is that the participants need to be clean and odorless, to ensure you’re actually measuring the effects of pheromones and not, say, odor. This review talks about this challenge[0].
You nose detects it and your brain reacts to it; it's odor. Just because you don't consciously perceive it doesn't mean it isn't odor. If it isn't odor then there isn't any other good word for it.
That’s not odor. Odor is perceivable.
If, let’s say for sake of argument, this study’s hypothesis is that the effect is caused by pheromones, then by definition it’s odorless.
In fact, one of the inherent challenges of trying to study this effect between humans is that the participants need to be clean and odorless, to ensure you’re actually measuring the effects of pheromones and not, say, odor. This review talks about this challenge[0].
0: https://www.ejog.org/article/S0301-2115(04)00474-9/fulltext