The Three NIH Sources: A Direct Verification Guide

This site cites three specific sources, all from the NIH — worth checking each one directly rather than assuming what they cover.

What the three sources actually are

An NIH Office of Dietary Supplements fact sheet on Vitamin B12, an NIH NCCIH overview on Passionflower, and an NIH Office of Dietary Supplements fact sheet on Magnesium.

Why citing NIH sources exclusively is worth noting

Unlike some similar sites that mix in PubMed, PMC, WebMD, or Healthline, this site's three citations all come from NIH — worth reading each as ingredient-level background rather than a trial of the finished combined formula.