The potato base is fine, but cheese and flavour seasonings can contain animal-derived enzymes or dairy whose rennet source is undeclared.
Reconstituted potato crisps made by Kellogg's (formerly Procter & Gamble): dehydrated potato, vegetable oil, rice flour, wheat starch, maltodextrin, emulsifier (typically E471), salt and a flavour seasoning that changes by variety.
The stackable shape is not the issue. The seasoning is.
In many markets the plainer salt flavours carry a vegetarian claim and use plant oil plus salt. Where that claim is present, animal rennet and gelatin are out. E471 still needs a plant origin confirmation if you are strict, but vegetarian labelling usually covers it.
Cheese, Sour Cream & Onion, and similar seasonings include dairy powders. Those powders inherit the rennet used in the original cheese. US packs often list enzymes without naming the source; UK and EU packs more often use microbial rennet and may carry a vegetarian flash.
| Flavour type | Typical risk |
|---|---|
| Ready Salted / Original | Lowest — check vegetarian claim |
| Cheese / sour cream | Dairy + enzymes |
| Meat or bacon flavours | Often non-halal flavourings |
| Sweet or exotic limited editions | Check colours and "natural flavours" |
Kellogg's formulates by market. A tube made for Malaysia or the Gulf may be certified; a US cheese flavour is frequently not. Always read the country of manufacture and any certification mark on the tube you are holding.
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