Why Cooking and Freezing Have Real Limits

Thorough cooking meaningfully reduces bacterial and viral risk (including Vibrio) — this is real and worth doing — but does not reliably destroy heat-stable marine biotoxins from a harmful algal bloom, and does not remove environmental contaminants like heavy metals or PFAS if present.

Freezing can slow bacterial growth and kill some parasites, but does not reliably destroy Vibrio bacteria, does not destroy marine biotoxins, and does not remove environmental contaminants either.

No technique this guide is aware of — soaking, purging, vinegar, alcohol, hot sauce, or any folk remedy — has been shown to reliably remove a marine biotoxin or environmental contaminant from shellfish tissue. This guide never claims otherwise, in any recipe or field-care instruction.