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Guide

What Ingredients Are Not Kosher? A Manufacturer’s Checklist

The ingredients that most often block kosher certification — and the certified alternatives. A practical checklist for producers.

Most products are closer to kosher-eligible than manufacturers expect — but a short list of ingredients causes the majority of issues.

Common flags: animal gelatin, animal rennet, carmine (cochineal) coloring, non-kosher animal fats and mono-/diglycerides, certain enzymes, grape-derived ingredients, shellfish derivatives, and L-cysteine from non-kosher sources.

The pattern — Most have certified or plant-based alternatives. Where one ingredient is a problem, it’s usually a swap, not a redesign.

Send us your ingredient list and we’ll flag anything early. Get a free, no-obligation quote → · How We Certify

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