Something to keep in mind is that since normal hydrogen is about 0.1% deuterium, all hydrogen-containing molecules end up also 0.1% deuterated by default - so t

Something to keep in mind is that since normal hydrogen is about 0.1% deuterium, all hydrogen-containing molecules end up also 0.1% deuterated by default - so the effects of a deuterated molecule can only differ from the normal to the point that in 0.1% concentration it would not be noticed.