Whey is a dairy ingredient, so any product using it is dairy — but there’s a second layer: much whey is a byproduct of cheesemaking, and cheese made with animal rennet raises its own kosher concern.
What this means — Whey protein, whey powder, and whey used as an ingredient all need their source and the cheese process behind them verified.
For protein and supplement brands — We confirm the whey source and label your product’s dairy status clearly. Get a free, no-obligation quote → · Powders & Protein