How do you describe your Research Support (part D of NIH's biosketch) if you've never been a named member of a grant? For junior researchers, NIH provides helpful guidance here on parts A (personal statement) and C (contribution to science). Certain applicants can skip the Research Support section (high school students, applicants for predoctoral or postdoctoral fellowships, applicants for dissertation grants), but what if you're none of those? I don't want to leave it entirely blank, but I don't want to mislead reviewers.
I disagree with @Formite's answer. My perspective is mostly related to NSF grants and faculty applications, not NIH proposals, but it's very common and not at all bad for new faculty to have nothing to list for external support. Many people list their university start-up funds -- this is a good thing to do, since it shows university commitment. I think it would be seen as misleading to write down grants for which you weren't a PI, for example things that funded you as a graduate student or postdoc.
I'm going to answer this by looking at my early biosketches and seeing what I did.
Basically, I very much doubt your research support section is blank. Research support is not necessarily just the grants you were the PI on, but any grant you have ever been funded on - so for example I listed the training grant I was on as a graduate student.
If you've never genuinely been funded in any way, then I would say leave it blank.