No black box warning on record for Defend Sinus
As of the latest FDA labeling reviewed, Defend Sinus (OYSTER SHELL CALCIUM CARBONATE, CRUDE, GOLDENSEAL, POTASSIUM DICHROMATE, AND PULSATILLA VULGARIS) does not carry a black box warning. Standard warnings and precautions still apply — see the full Defend Sinus medicine page for the complete safety profile.