Barium Sulfate

Barium sulfate is an insoluble, inert mineral pigment/opacifier used in leave-on and rinse-off products, typically at low-to-moderate percentages; it does not bioavailable-release barium ions and is generally non-reactive on skin. Clinical experience and patch-test data suggest very low irritation potential, with problems more likely from mechanical friction (powdery formulations) or contamination rather than the compound itself. For highly compromised eczema or post-procedure skin, I still avoid calling it fully inert, so I score it as exceptionally gentle rather than 0.0. Safety Notes: In consumer cosmetics, barium sulfate is mainly used as an inert white pigment/filler and for slip/soft-focus, appearing at trace-to-low levels (~0.01–1%) in liquid foundations, tinted sunscreens, primers, and some skincare-makeup hybrids. The upper end is seen in OTC, consumer-available color cosmetics (e.g., pressed/loose powders and some high-coverage creams) where barium sulfate can function as a major filler/opacifier, reaching roughly 10–25% in certain formulations. It is overwhelmingly a leave-on use in facial makeup/complexion products; true skincare-only leave-on creams/lotions typically sit at the low end, while rinse-off products rarely use it and usually only at trace levels if present.