Quick Answer
Must be from marine or halal-slaughtered sources.
Detailed Explanation
What is it?
Collagen is a popular cosmetics.
Why it may be doubtful
Collagen is used in anti-aging creams and supplements. It is extracted from animal connective tissue. If it is "marine collagen" (fish), it is halal. If bovine, it must be zabiha. Porcine collagen is haram.
Fiqh considerations
General Islamic dietary principles require that ingredients be free from non-Zabiha meat, insects, and intoxicating alcohol.
Practical advice
Always read the latest ingredient label or use the allhalal.info scanner app, as manufacturers frequently change their recipes. Look for certified vegan or halal symbols where possible.
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