The “most boring active ingredient” in cosmetics: Why glycerine is anything but mundane
When formulators are asked which raw material sounds the least spectacular, one name often comes up: glycerine. No exotic origin, no high-tech peptide, no patented brand name. And yet, glycerine is one of the most effective, safest, and scientifically best-documented ingredients in modern skincare.
Anyone who delves deeper into skin physiology quickly realizes: Without glycerine, neither the skin barrier nor sustained hydration works.
What is glycerine?
INCI: Glycerin
Chemical name: Propan-1,2,3-triol
Molecular formula: C₃H₈O₃
Molar mass: 92.09 g/mol
CAS number: 56-81-5
Physicochemical properties
- Clear, viscous, hygroscopic liquid
- Highly water-soluble
- Sweetish taste (irrelevant for cosmetics, but characteristic)
- High boiling point (~290 °C)
- Three hydroxyl groups → strong water-binding capacity
The three OH groups make glycerine a highly effective humectant with pronounced hygroscopic activity.
Where does glycerine occur naturally in the body?
Glycerine is not a “foreign substance.” It is a natural component of the human organism:
- Component of triglycerides (adipose tissue)
- Building block of phospholipids (cell membranes)
- Component of the Natural Moisturizing Factor (NMF)
- Intermediate in energy metabolism (gluconeogenesis).
In the skin, glycerine contributes significantly to the hydration of the stratum corneum. Aquaporin-3 transport channels actively regulate glycerine transport between the dermis and epidermis, which is crucial for elasticity and barrier function.
Its “unspectacular” efficacy is scientifically proven
Hardly any other humectant has been studied as extensively as glycerine.
- Improvement of the skin barrier: Fluhr et al. (2008) demonstrated that glycerin strengthens the barrier function and accelerates regeneration following barrier damage.
- Increased skin elasticity: Lodén (2003) documented significant improvements in skin moisture and elasticity with topical application.
- Long-term hydration: Studies show that glycerin not only binds water in the short term but also positively influences lipid organization in the stratum corneum.
- Protection against irritation: Formulations containing glycerin significantly reduce transepidermal water loss (TEWL).
Conclusion of the research: This supposedly “boring” active ingredient is among the most well-validated humectants worldwide.
Benefits of glycerin in cosmetic products
Why is glycerin found in practically every emulsion?
– Highly hygroscopic – binds water efficiently
– Supports the skin barrier
– Improves skin elasticity
– Reduces TEWL
– Non-comedogenic
– Very high skin tolerance
– Suitable for sensitive skin
– Ideal for combining with amino acids, urea, hyaluronic acid, and ceramides
At low concentrations (2–5%), glycerin has a hydrating effect; at higher concentrations (10–20%), it intensively binds moisture—depending on the overall formulation.
Industrial extraction – sustainable and vegan
In the past, glycerin was often obtained as a byproduct of soap production from animal fats. Today, it is primarily derived from biodiesel production (upcycling): During the transesterification of vegetable oils (e.g., rapeseed, soy) into fatty acid methyl esters, crude glycerin is produced as a byproduct.
This is purified and processed to pharmaceutical or cosmetic grade.
- Fat recycling: Recycling vegetable fats and oils also yields high-quality glycerin.
- Plant sources: Hydrolysis of plant triglycerides.
Modern production is thus:
- Non-animal
- vegan
- Upcycling-based
- sustainably available
Glycerine is thus a prime example of the circular economy in cosmetics.
Why glycerin belongs in every modern formulation
Despite the peptide hype, the exosome trend, and biotech active ingredients, glycerine remains the quiet stabilizing anchor of nearly every successful formulation.
- Stabilizes emulsions
- Improves sensory properties
- Increases active ingredient penetration
- Supports the skin’s barrier function
- Complies with global regulations without issue
In short: not a glamorous marketing star, but the foundation.
New products with glycerin for your brand
For a quick market entry, Tojo Cosmetics offers immediately available, EU-compliant white-label products in which this active ingredient is already formulated.
For custom production orders, Cosactive offers formulation-tested active ingredient blends starting at low usage levels.
At our partner company Cosmacon, we are happy to assist you with custom product development using this innovative active ingredient.
Just get in touch right away!