Glycerin is the classic humectant, but it is not the only one — and for many modern formulations, hydroxyethyl urea (HEU, CAS 1320-51-0) offers a better feel. This guide compares HEU and glycerin side by side so formulators can choose the right humectant, or blend both.
1. The Humectant Job
A humectant attracts and holds water in the skin or hair, providing moisturization. Glycerin is the industry reference — effective, cheap and ubiquitous. HEU is a newer-generation humectant that competes on feel and mildness. The right choice depends on your formula’s sensory target and cost.
2. Side-by-Side Comparison
| Aspect | Hydroxyethyl urea | Glycerin |
|---|---|---|
| Humectancy | Effective | Excellent (strong per gram) |
| Feel | Light, non-sticky | Sticky at high dose |
| Irritation profile | Very mild | Generally mild |
| Solubility | Water-soluble | Water-soluble |
| Compatibility | Broad | Very broad |
| Cost | Higher | Low |
3. When to Use Each
Choose HEU when:
- You want a light, non-sticky after-feel (serums, premium creams, gels).
- The formula targets sensitive skin (mildness matters).
- You need a humectant that does not overpower the sensory profile.
Choose glycerin when:
- Cost is the priority (glycerin is much cheaper).
- Strong, sustained humectancy is needed at high dose.
- The formula can tolerate its thicker feel.
4. The Blend Strategy
Most modern formulas use both: glycerin for cost-effective bulk humectancy, HEU for feel and mildness. A typical blend might be 2-3% glycerin + 1-2% HEU, tuned by sensory testing. This gives maximum moisturization with a premium feel at reasonable cost.
5. FAQ
Is HEU better than glycerin?
Not universally — glycerin is a stronger humectant per gram and cheaper. HEU wins on feel and mildness. They are complementary, not either/or.
Can I replace all the glycerin with HEU?
Technically yes, but you will likely need a higher HEU level to match humectancy, increasing cost. Blending is usually the best approach.
Is HEU suitable for sensitive-skin products?
Yes — its low-irritation profile makes it a good choice for sensitive-skin and baby care formulations.
Do HEU and glycerin work together?
Yes, they are highly compatible and commonly blended.
6. References and Further Reading
- Cosmetic formulation literature on humectants
- INCI and safety data for hydroxyethyl urea and glycerin
This article is published for industrial and technical reference by PolyblueChem. Optimize blends by formulation testing.
PolyblueChem supplies hydroxyethyl urea (CAS 1320-51-0) in cosmetic grade with COA and MSDS. See our HEU guide. Contact us for specifications and quotations.