One of the mysteries of the English language finally explained.
A crystalline compound formed in the nitrogen metabolism of many mammals (excluding primates).
- ‘And he was right, since plantain contains allantoin, a proven healer of injured skin cells.’
- ‘Oftentimes, it is not the cortisol stimulating properties which are cited for their healing properties but some other biochemical agent such as allantoin in comfrey.’
- ‘Comfrey contains allantoin, a natural substance that stimulates the growth of new skin cells.’
- ‘Formulated with glycerin and allantoin, it will also moisturize and protect any tiny cuts left by your razor.’
- ‘The active compounds are allantoin and rosmarinic acid.’
Mid 19th century: from allantois (because it was discovered in the allantoic fluid of cows) + -in.
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