Blemish | July 13, 2026

QUICK TAKE: MOST SKINCARE PRODUCTS FOR AGING SKIN WORK AT THE SURFACE

• Most skincare products for aging skin work at the surface, improving how skin looks without meaningfully changing how it functions.
• As skin ages, its natural production of growth factors declines, and the signaling that drives collagen synthesis, cellular renewal, and structural support slows with it.
• ZO® Growth Factor Serum addresses this at the source with Human-Comparable Growth Factor Technology: five synthesized human-comparable growth factors (IGF-1, EGF, acidic FGF, basic FGF, and VEGF) designed to support skin's foundational functions.
• In a 12-week independent clinical study, subjects agreed that their skin looked lifted and supported, and they felt their skin appeared nearly 6 years younger after 8 weeks of use.
• The serum is indicated for aging skin with visible loss of density, thinning, and reduced elasticity.
• It works best alongside other actives, not as a replacement for them.

What Makes ZO® Growth Factor Serum Different From Other Skincare Products?

By ZO® Skin Health

Most skincare products formulated for aging skin share a common approach: they work on the surface. They hydrate, they add slip, and they temporarily plump. A few go further with ingredients like retinol or vitamin C, which genuinely do influence cell behavior and pigment production at a meaningful level. But even these have a ceiling. They improve what's visible; they don't directly address the biological machinery driving the decline.

That gap is where growth factor science operates. And with the 2026 formulation of ZO Growth Factor Serum, the technology behind it has taken a significant step forward.

 

What Happens to Skin as It Ages

To understand why growth factors matter, it helps to understand what aging skin is actually losing.

In younger skin, growth factors are produced in abundance. These are signaling proteins that coordinate a broad range of cellular activity: collagen synthesis, skin cell renewal, the maintenance of the extracellular matrix, and the structural integrity of the dermal-epidermal junction. As the skin ages, production of these proteins declines. The signals become less frequent, and the downstream effects compound over time: skin thins, loses density, becomes less elastic, and the visible architecture that gives it structure and support begins to degrade.

This is distinct from surface concerns like dryness or uneven tone. It is a functional change in how skin operates at a cellular level, and it requires a different kind of response.

The Science Behind Growth Factor Serum

The ZO® Growth Factor Serum is built around Human-Comparable Growth Factor Technology: a combination of five synthesized human-comparable growth factors, IGF-1, EGF, acidic FGF, basic FGF, and VEGF. These are not plant-derived or enzymatically derived alternatives. They are synthesized to match the growth factors the skin produces natively, which is what allows them to interact with skin cell receptors and support the signaling pathways that decline with age.

This matters because the body's own growth factors work through receptor-mediated communication. Human-comparable growth factors are designed to provide exactly that.

Supporting this core technology is a formulation built for depth and durability. Key actives include:

• Human-Comparable Growth Factors: An innovative combination of 5 synthesized human-comparable growth factors (IGF-1, EGF, acidic FGF, basic FGF, and VEGF) that work to reverse the visible signs of aging and aid in skin rejuvenation and vitality
• Disodium acetyl glucosamine phosphate: An enzymatically derived form of n-acetyl glucosamine that helps support the appearance of a more youthful plumpness, thickness, and elasticity.
• Lactobacillus/panax ginseng root extract: A plant-derived fermented red ginseng extract that helps reduce the appearance of lines and wrinkles.
• Dipeptide Diaminobutyroyl Benzylamide Diacetate (DDBD): A neuropeptide that temporarily reduces the visible impact of expression lines and contributes to a smoother appearance.
• ZPRO®: ZO's exclusive biomimetic sericin protein complex, which contributes to a more supple and hydrated appearance while providing antioxidant support.

Together, these ingredients support the extracellular matrix, help improve the appearance of skin thickness and elasticity, and work across multiple pathways of skin aging, rather than targeting a single visible concern.

What the Clinical Data Shows About ZO® Growth Factor Serum

ZO® Growth Factor Serum has 18 years of growth factor innovation behind it. The 2026 formulation was evaluated in a 12-week independent third-party clinical study of 46 subjects, all female, aged 44 to 74, with Fitzpatrick skin types II through VI, and moderate to severe signs of aging. Key outcomes:

• 100% of subjects agreed skin looked lifted and supported
• 98% agreed skin felt thicker, more cushioned, and more structurally intact
• Subjects felt their skin appeared nearly 6 years younger after 8 weeks of use
• 42% improvement in visible radiance and texture (expert grader measurement)
• 15% improvement in the appearance of skin density in 8 weeks (DermaLab® Ultrasound measurement)
• 16% improvement in visible elasticity (Cutometer® Dual MPA 580 measurement)

These are not perception-only outcomes. Several are backed by instrumental measurement, which is the standard ZO holds all of its clinical evidence to.

How It Compares to Other Actives

Growth factor science complements rather than replaces the actives already doing meaningful work in your system. Knowing where each fits helps clarify why layering them together produces better outcomes than relying on any one of them alone.

Growth Factors vs. Retinol

Retinol accelerates cell turnover, stimulating the production of new epidermal cells and supporting collagen synthesis in the dermis. Its effects are well-documented and meaningful. What it doesn't do is directly address the structural density loss and signaling decline that growth factors target. Used together, retinol drives surface renewal while growth factors support the deeper infrastructure that gives skin its thickness and elasticity.

Growth Factors vs. Vitamin C

Vitamin C neutralizes free radical damage from UV exposure and environmental stressors, and plays a significant role in collagen synthesis through its support of prolyl hydroxylase activity. It also helps improve the appearance of uneven tone and discoloration. Growth factors address a different dimension: the structural and functional decline in skin density, elasticity, and extracellular matrix integrity. Each works on a distinct pathway; both are worth using.

Growth Factors vs. Peptides

Peptides are highly targeted. Each is designed to influence a specific process: a particular receptor, a single step in collagen synthesis, or the temporary relaxation of expression-related muscle contraction. Growth factors operate more broadly, supporting cellular renewal and the extracellular matrix across multiple processes simultaneously. The two approaches work well in parallel, with peptides reinforcing specific targets and growth factors supporting the wider foundation.

What to Expect, Realistically

Growth factors work gradually. Some effects, particularly improvements in hydration and surface appearance, may be noticed relatively early. The structural work, improvements in visible skin thickness and elasticity, builds over weeks. The clinical data referenced above reflects outcomes at 8 and 12 weeks of consistent use. That timeline is worth setting expectations against: this is a product for people who are investing in long-term skin health, not looking for an immediate visible change.

Consistent use within a complete system produces the best results. The clinical study protocol used Growth Factor Serum twice daily alongside Gentle Cleanser and Sheer Fluid Broad Spectrum Sunscreen SPF 50, which reflects how ZO products are designed to perform: within a protocol, not in isolation.

Common Misconceptions

"All growth factors in skincare are the same."

They are not. Plant-derived, enzymatically derived, and human-comparable growth factors differ meaningfully in their structural compatibility with the skin's own receptors. ZO's formula uses both human-comparable and plant and enzymatically-derived growth factors specifically because of the receptor interaction this allows.

"Growth factors replace other actives."

They address a different dimension of skin aging. Retinol, vitamin C, and peptides each have defined mechanisms that growth factors don't replicate. The clinical case for using them together is stronger than the case for using any one alone.

"Results should be visible in days."

The biological work growth factors support, collagen synthesis, extracellular matrix integrity, improved skin density, operates on a cellular timescale. The 8-to-12-week mark is when the clinical evidence shows meaningful, measurable outcomes. Expecting faster results sets up an unfair evaluation.

"Growth factors are derived from human tissue and raise safety concerns."

The growth factors in ZO® Growth Factor Serum are synthesized to be human-comparable, not derived from human sources. This approach addresses the stability, penetration, and ethical considerations associated with earlier generations of growth factor technology in skincare.

The Right Context Makes the Difference

ZO® Growth Factor Serum is built on 18 years of growth factor science, now advanced with Human-Comparable Growth Factor Technology and supported by independent clinical data. For aging skin dealing with visible thinning, loss of density, and reduced elasticity, it works at a level most topical skincare doesn't reach.

Whether it's the right fit for your skin and where it belongs within your specific protocol is a question best answered with professional input. An authorized ZO dermatologist or physician can assess your skin directly and prescribe the appropriate system rather than leaving you to work it out by trial and error.