Ultra-Hydrating Serum

Full ingredient list, decoded

39 ingredients, in label order (highest amount first; below about 1% the order is free).

1. 1AquaAqua is the INCI name for water, the main base of many creams, lotions and cleansers…
2. 2GlycerinGlycerin is a clear, thick, odorless liquid that pulls water into the skin and helps…
3. 3DimethiconeDimethicone is a silicone, a light, water-resistant oil that forms a smooth, breathable…Silicones
4. 4Butylene GlycolButylene Glycol is a clear, odorless liquid that attracts and holds water. It is a…
5. 5Neopentyl Glycol Diheptanoate
6. 6Aluminum Starch OctenylsuccinateAluminum Starch Octenylsuccinate is a starch that has been chemically modified and…
7. 7IsododecaneIsododecane is a light, branched oil made only of carbon and hydrogen, mainly used as a…
8. 8Polyacrylate Crosspolymer-6
9. 9BetaineBetaine is a naturally occurring, gentle compound that attracts and holds water, mainly…
10. 10Caprylyl GlycolCaprylyl Glycol is a mild, multi-tasking ingredient that softens skin and helps keep…
11. 11EthylhexylglycerinEthylhexylglycerin is a lab-made, skin-friendly ingredient that boosts the power of…
12. 12Pentylene GlycolPentylene Glycol is a small, multi-tasking liquid that attracts water to the skin and…
13. 13Cetearyl Olivate
14. 14DimethiconolDimethiconol is a silicone with reactive chain ends. It forms a thin, smooth film on…Silicones
15. 15Sodium PCASodium PCA is a salt that helps skin and hair hold water. It is a humectant, meaning it…
16. 16Sorbitan OlivateSorbitan Olivate is a plant-derived emulsifier made from sorbitol and olive oil fatty…
17. 17Tocopheryl AcetateTocopheryl Acetate is a stable form of vitamin E. Its main job is to act as an…
18. 18Fructose
19. 19Sodium HyaluronateHyaluronic acid is a sugar-based molecule, naturally found in skin, that holds a lot of…
20. 20Sodium LactateSodium Lactate is the sodium salt of lactic acid, a mild alpha hydroxy acid. It mainly…
21. 21UreaUrea is a naturally occurring compound that your skin also makes, and it is a common…
22. 22Citric AcidCitric acid is a mild, naturally occurring acid found in citrus fruit. In skincare and…
23. 23PCA
24. 24Sodium HydroxideSodium hydroxide is a strong alkali, also called caustic soda. In small amounts it…
25. 25Maltose
26. 26SerineSerine is an amino acid, a small building block of proteins, that helps attract and…
27. 27Alanine
28. 28Sodium ChlorideA simple mineral salt, made of sodium and chloride, used mainly to adjust thickness and…
29. 29TrehaloseA plant-derived sugar, made of two glucose units, that holds water and helps keep…
30. 30GlycineGlycine is the simplest amino acid, a small protein building block that helps balance…
31. 31t-Butyl Alcohol
32. 32AllantoinAllantoin is a white crystalline powder that soothes and softens skin and is widely…
33. 33Glutamic AcidGlutamic Acid is an amino acid that occurs naturally in the body and in skin. In…
34. 34Lysine HCl
35. 35Threonine
36. 36ArginineArginine is an amino acid, one of the natural building blocks of proteins. In hair…
37. 37GlucoseGlucose is a simple sugar, usually made from corn or other starches. In skincare it…
38. 38ProlineProline is an amino acid, a building block of protein. In skincare and haircare it…
39. 39TocopherolTocopherol is vitamin E, a fat-soluble antioxidant. Its main job is to slow the…

Source: Neutrogena Hydro Boost product page, www.neutrogena.co.uk/skincare/serums/hydro-boost-ultra-hydrating-serum, retrieved November 5, 2026.

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