What Does “No Documented Interaction Identified” Mean?

This is by far the most common result on this site -- most reviewed pairs in the current catalog show it, not a rare edge case. It is also the result most likely to be misread, so it is worth explaining precisely.

What it means

"No documented interaction identified" means that when we reviewed the authoritative sources for both substances -- FDA/ DailyMed labeling, NIH Office of Dietary Supplements fact sheets, clinical guidelines, and peer-reviewed research -- none of them documented an interaction claim for that specific pair. It is a statement about the current state of published evidence and our review of it.

What it does not mean

It is not a certification that the combination is safe for everyone, at every dose, in every formulation. A lack of documented evidence does not prove safety for pregnancy, kidney or liver impairment, older adults, children, allergies, other concurrent medications, or individual genetic variation in drug metabolism. Absence of evidence is not evidence of absence.

How this is different from "not yet reviewed"

This site distinguishes two different states that could both look like "nothing to worry about" at a glance, but are not the same:

• Not yet reviewed -- our research process has not reached this specific pair yet. The checker says this directly, and it is not the same as having checked and found nothing.
• No documented interaction identified -- the pair has genuinely been researched, and the sources checked did not document an interaction. This is a real research outcome, shown with its own distinct label so it is never confused with the first case.

Why we publish this result at all

Some reference sources only publish positive findings -- pairs with a documented interaction -- and stay silent on everything else, which makes it impossible to tell whether a pair was checked and cleared, or simply never looked at. We publish the negative result explicitly, with its sources, so that distinction is never lost. See the methodology page for the full review process, and the medical disclaimer for how to use this information responsibly.