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An oxidation product of uric acid, C4H6N4O3, found in the urine of most mammals (except humans and related primates) as the metabolic end product of purine oxidation, and also found in some plants. It is also produced synthetically and is often used in cosmetics and pharmaceuticals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) a substance derived from the secretions of snails and contained in some plants, used in skin care products and valued for its soothing properties
[C19: from allantois]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(əˈlæn toʊ ɪn)

a white powder, C4H6N4O3, produced by oxidation of uric acid: used as an emollient.
[1835–45; allanto (is) + -in1; so named because it is found in the fluid of the allantois]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Glyoxylic acid derivative allantoin is broadly used in the cosmetics and personal care industry, because of its activeness in skin softening and cell regeneration by the precipitating proteins on skins.
M2 PRESSWIRE-August 14, 2019-: Allantoin Markets, 2019 - Global Analysis, Trends, and Forecasts to 2025
INSTITUT ESTHEDERM CELLULAR WATER MIST, PS18, FEEL UNIQUE BEST FOR: SENSITIVE SKIN Combining La Roche-Posay's famed thermal water with just eight other ingredients - including allantoin, which soothes irritation - this ultra-light, fragrancefree mist is ideal for those with sensitive skin.
The first aid products include an eczema medicated ointment, with colloidal oatmeal as the active pharmaceutical ingredient, and an itch and rash medicated ointment, formulated with allantoin and lidocaine as active ingredients.
It also has other skincare ingredients like allantoin, which comforts the skin, burdock root which moisturizes, and of course, calendula, which takes away excess oil.
The oxidation of uric acid by peroxidases or by oxidants yielded during inflammation generates allantoin as the main final product (9,10).
Plantain contains the well-documented cell proliferant known as allantoin, and can promote rapid regeneration of healthy skin when used to treat abrasions, wounds, and ulcerations.
The minerals magnesium, zinc, iron and germanium, which plays an important role in all bio-chemical life and is found in the soil and water at Lourdes that also contains Pfaffic acid, allantoin, sitosterol and stipmasterol.
To measure the concentration of milk allantoin, a mixture of 8 mL milk and 4 mL of trichloroacetic acid (25% w/v) was centrifuged (Sorvall ST16R, Thermo Fisher Scientific Inc., Waltham, MA, USA) for 10 minutes at 2,000 rpm.
Allantoin was performed as described by CHEN & GOMES (1995), and a commercial kit (Labtestdiagnostica S.A., Lagoa Santa, Brazil) was used for the determination of creatinine.
Sodium hyaluronate, known for its ability to hold 1,000 times its weight in water, saturates the lashes in hydration, boosting softness, elasticity, and shine, while allantoin from the comfrey plant helps soothe, calm, and moisturize lashes.