Allergenic food should be stored in clearly separated, well‑sealed, and labeled areas so that it cannot drip, spill, or crumble onto non‑allergenic food, with special care to avoid storage above “safe” items.

Core storage rules

  • Keep allergenic foods physically separated from non‑allergenic foods, using dedicated shelves, bins, or a separate section of the pantry, fridge, or freezer.
  • Use sealed containers with tight‑fitting lids so crumbs, dust, or spills cannot escape.
  • Clearly label containers and shelves with the specific allergen (e.g., “CONTAINS: PEANUTS”) so everyone in the kitchen can identify them at a glance.

“Where” to store allergenic foods

  • In commercial or institutional kitchens, store allergen‑containing ingredients in a dedicated storage area (room, rack, or section) that is not used for non‑allergenic foods.
  • If a separate room or rack is not possible, place allergenic foods on shelves below non‑allergenic foods so any leaks or damaged packaging cannot drip onto safe items.
  • In homes, many allergy organizations recommend the reverse: keep the allergen‑free products on the top shelves and the regular/allergenic products lower down so that spills from allergens cannot fall onto the safe food.

Practical tips for home kitchens

  • Mark a specific shelf or zone in the pantry and fridge as the “allergy‑safe shelf” and instruct everyone to always return safe foods there.
  • Keep allergen‑free foods in their original packaging where possible, or transfer to clean lidded containers and tape the ingredient label onto the container.
  • Avoid shared, messy areas (like open bins or bulk containers) for allergenic foods, since dust or crumbs can easily spread.

Extra safeguards in professional settings

  • Use color‑coded labels, wrap, or containers (e.g., red for peanut, blue for dairy) for quick allergen identification in storage.
  • Establish written procedures describing exactly where allergenic ingredients are staged and stored and train staff to follow them consistently.

TL;DR: Store allergenic foods in sealed, clearly labeled containers in a dedicated area, and position them so that if anything leaks or spills, it cannot contaminate allergen‑free food—this is the key to preventing cross contact.

Information gathered from public forums or data available on the internet and portrayed here.