How can we extract allantoin from onion?

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Aiman Eid Al-Rawajfeh

Dear Sir

Thanks for sharing the question with me, I benefit from your answer.

Ian Edwin Cock

As Magdelena above has pointed out, these are different substances. They are sometimes formulated together (eg in Mederma for skin problems).

Christopher Bradley

Could you be thinking of allium, not allantoin?