The MCAS Community by Mast Cell 360

Practitioner Tip: Are Fillers and Other Ingredients Sabotaging Your Stabilization?

The article highlights that inactive ingredients—fillers, binders, coatings, and preservatives—can trigger mast cell activation in people with MCAS, even when the active supplement is well‑tolerated. It lists common culprits such as citric acid, titanium dioxide, corn starch, and magnesium stearate, and explains why label scrutiny is essential. The author advises practitioners to teach patients label‑reading, consider compounding filler‑free alternatives, and use a printable ingredient checklist. The piece positions these steps as critical for successful supplement onboarding in sensitive individuals.