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Is Protein Powder halal?
In the case of plant based protein then of course they are halal. However when it comes to why protein powder or casein, things get tricky.
Whey is a byproduct of the cheese making process where milk is curdled by adding either “Rennet” or “pepsin”. So if the whey is derived from the use of pepsin then it would not be halal. In the case of whey derived from Rennet, it would be halal if it was obtained from non-slaughtered animals or ritually slaughtered animals.
There are some products on the market which are certified, but these remain costly. We would recommend choosing a plant based protein product for best value in this case.