Is Silica Gel Toxic?

Silica gel packets are desiccants. A 2015 report in ACG Case Reports Journal explains that a desiccant is a substance that absorbs water to preserve and protect products from moisture, often packed with supplements and medications, and that desiccants may look similar in size and shape to the pills they are packed with. A 2020 case report in Clinical Practice and Cases in Emergency Medicine says the vast majority of ingested silica results in an innocuous event, only occasionally causing self-limited mouth and throat discomfort.

The bigger risk is choking or a blockage. The same 2020 report warns that newer cylindrical desiccant containers may pose a significant choking hazard in adults, and describes a 70-year-old man who unknowingly swallowed one with his daily medications and then had chest pain and could not swallow. A 2025 case report in Trauma Surgery and Acute Care Open describes a swallowed desiccant that caused an obstruction in a normal small bowel, and says desiccant size and rigidity alone can cause mechanical obstruction.

ATSDR says oral exposure to crystalline and amorphous silica does not appear to be an exposure route of concern. Federal food additive rules at 21 CFR 172.480 say the food additive silicon dioxide may be safely used in food in accordance with specified conditions.