Previous studies have shown that pollen products sold as nutritional supplements and used in apitherapy may contain toxic pyrrolizidine alkaloids (PAs) if bees collect pollen from PA-containing plants. such as Echium vulgare. In this study. the botanical origin of pollen from two observation sites was studied. https://www.jmannino.com/best-grab-Kelway-SST-Salinity-Tester-top-mega/