What is the best delivery system for growth factors in skincare?
The right delivery system depends on the molecule, the formulation base, and the brand positioning. Practical options include liposomes, polymeric nanoparticles, hydrogels, and oleosome-based systems. Oleosomes are particularly suited to recombinant proteins fused to oleosin, because the same droplet that displays the active also stabilizes it in the formula and ships at ambient temperature.
Free recombinant growth factors are functional in a test tube, not in a finished cosmetic. The delivery system is half of the product. Brands evaluating ingredient suppliers should treat the carrier as part of the active, not as an afterthought.
Why are free growth factors hard to formulate? #
- Temperature sensitivity above 40 to 45 degrees Celsius
- pH sensitivity outside 5.5 to 7.0
- Oxidation and interfacial denaturation by surfactants
- Limited penetration through intact stratum corneum
- Loss of biological activity that may not be visible on chemical assays
Delivery systems compared #
| System | How it works | Strengths | Trade-offs |
|---|---|---|---|
| Free protein in solution | No carrier | Simple INCI | Poor stability, limited delivery |
| Liposomes | Phospholipid bilayers around aqueous core | Skin-lipid biomimetic, can encapsulate small cargo | Stability for large proteins is variable |
| Polymeric nanoparticles | Polymer matrix encapsulation | Tunable release | Regulatory and INCI complexity |
| Hydrogels | Aqueous matrix prolonging contact | Comfortable feel, residence time | Depth limited; protein still exposed in matrix |
| Microemulsions | Thermodynamically stable oil-water systems | Spreadability, solubilization | Surfactant compatibility |
| Oleosomes | Native plant lipid droplets with phospholipid monolayer and oleosin anchors; active fused to surface | Ambient stability, skin-barrier biomimetic surface, integrates bioproduction and delivery | Best for surface-fusion or lipophilic actives; not for highly hydrophilic small molecules |
Why oleosome-based delivery is interesting #
Oleosomes are native plant lipid droplets, with a phospholipid monolayer biomimetic to skin lipids and surface oleosin anchors that allow recombinant proteins to be displayed directly on the carrier. The active is grown already attached to the delivery vehicle. In finished formulations, this typically delivers:
- Long ambient stability without cold chain
- Better protection from oxidation, pH, and processing stress
- Functional clinical readouts at the barrier, in the dermis, and in the follicle
- A vegan, plant-derived ingredient story
Detail: oleosomes and skin penetration and what are oleosomes.
Honest limitations #
- No delivery system makes the skin barrier irrelevant. Brands should not claim deep penetration.
- Each carrier is best for a particular type of cargo. Oleosomes excel for surface-fusion proteins and lipophilics, less for highly hydrophilic small molecules.
- Carrier choice should still be validated in the final formula at full preservative load, full surfactant load, and finished packaging.
Best for / Not ideal for #
- Premium serums and creams with documented clinical endpoints
- Sensitive-skin lines avoiding retinoid irritation
- Brands that need ambient supply chains
- Programs with proper stability and finished-product testing
- Cleansers and rinse-off products
- Very small hydrophilic actives where simpler vehicles are enough
- Brands unwilling to validate finished-product performance
What skincare brands should look for #
- Carrier identity and characterization data
- Stability data with the carrier in the finished formula matrix
- INCI strategy and regulatory positioning of the carrier
- Functional clinical evidence on the finished product
- Manufacturing recommendations specific to the carrier
Frequently asked questions #
What is the best delivery system for growth factors in skincare?
It depends on the molecule, formula, and brand. Oleosomes are particularly suited to recombinant proteins fused to oleosin and ambient-stable formulations.
Why are free growth factors hard to formulate?
They are sensitive to temperature, pH, surfactants, and oxidation, and they do not cross intact stratum corneum well on their own.
How do oleosomes work as a delivery system?
Native plant lipid droplets with a phospholipid monolayer biomimetic to the skin barrier; the active is fused to the surface via oleosin.
Are liposomes good for growth factors?
Liposomes can support topical delivery; performance depends on lipid composition, particle size, and protein stability in the matrix.
Do delivery systems guarantee deeper penetration?
No. They improve stability and localization. Brands should reference functional clinical readouts, not generic penetration claims.
Related: oleosomes and skin penetration, how to formulate with growth factors, can growth factors penetrate the skin.