Daily Power Defense is ZO's everyday barrier and antioxidant serum, used morning and night. Growth Factor Serum is a lightweight gel aimed at the look of expression lines and firmness. They are built for different jobs, and most routines end up using both.
Quick answers
- Which one should I start with?
- Daily Power Defense. It is the foundation step in almost every ZO routine and it is used twice a day.
- What does each one do?
- Daily Power Defense supports the skin barrier and delivers antioxidants. Growth Factor Serum targets the look of expression lines, wrinkles and firmness.
- Can I use both?
- Yes. Growth Factor Serum goes on first, Daily Power Defense second.
- When do you use them?
- Daily Power Defense morning and night. Growth Factor Serum morning and night, before it.
- What do they cost?
- Daily Power Defense $145 (30 ml) or $230 (50 ml). Growth Factor Serum $245 (30 ml).
The short answer
These two serums are often compared because they sit at a similar place in a ZO routine and carry a similar price tag. They are not alternatives to one another.
Daily Power Defense is a maintenance product. It is what you use every day, twice a day, indefinitely. Its job is to support the skin barrier and supply antioxidants: the unglamorous work that everything else in a routine depends on.
Growth Factor Serum is a corrective product. It is aimed at a specific visible concern: expression lines, wrinkles and loss of firmness. You add it when that concern is your priority.
If you can only buy one. Start with Daily Power Defense. It is the step the rest of a ZO routine is built around, and it is the one most people notice first in terms of how their skin feels day to day. Add Growth Factor Serum once that foundation is in place.
What Daily Power Defense does
Daily Power Defense is a lightweight serum used morning and night on clean skin. ZO positions it as a daily defence step: antioxidant support against environmental stress, plus ingredients that help the skin barrier look and feel more resilient.
It is also the reason a lot of people find their ZO routine gets easier over time rather than harder. A skin barrier that is well supported tolerates actives better, which matters if retinol or acids are anywhere in your routine.
Who it suits
- Anyone starting a ZO routine. This is the default first serum.
- Skin that feels reactive, tight or easily irritated by actives.
- Anyone already using a retinol who wants barrier support alongside it.
- Routines that need one product to do steady work rather than fast work.
What Growth Factor Serum does
Growth Factor Serum is a lightweight gel serum built around growth factor technology. Its focus is narrower than Daily Power Defense: the look of expression lines, wrinkles and firmness.
The texture is worth mentioning because it changes how people use it. It is a gel rather than a lotion, it absorbs quickly, and it layers cleanly underneath other products, which is why it sits first in a routine rather than last.
We have a fuller write-up of this product in our ZO Growth Factor Serum guide, including the reformulation and how it compares to the eye version.
Who it suits
- Skin where expression lines and firmness are the main visible concern.
- Routines that already have a solid daily foundation in place.
- Anyone who wants a corrective serum that layers well under moisturiser and SPF.
- Post-procedure routines, on your clinician's timeline rather than a general one.
Side by side
Daily Power Defense
Growth Factor Serum
| Question | Daily Power Defense | Growth Factor Serum |
|---|---|---|
| What is it for? | Everyday barrier support and antioxidant defence | Helping minimise the look of expression lines and wrinkles |
| Role in a routine | Foundation, the step you keep | Corrective, the step you add |
| When | Morning and night | Morning and night |
| Order of application | Second | First |
| Texture | Lightweight serum | Lightweight gel |
| Sizes and price | 30 ml $145 · 50 ml $230 | 30 ml $245 |
| Buy it first if | You are new to ZO, or your barrier needs support | Lines and firmness are your priority and your basics are covered |
Which one is right for you
| Your situation | Start with | Why |
|---|---|---|
| New to ZO Skin Health | Daily Power Defense | It is the step the rest of the range is designed around |
| Skin feels reactive or tight | Daily Power Defense | Barrier support is the priority before anything corrective |
| Expression lines are the priority | Growth Factor Serum | It is formulated for the look of lines and firmness specifically |
| Already on a retinol | Daily Power Defense | Retinol routines benefit most from steady barrier support |
| Routine is established, want more | Both, layered | They do different jobs and are designed to be used together |
How to layer both
The rule is thinnest to thickest, and Growth Factor Serum is the lighter of the two.
- Cleanse, and tone if your routine includes it.
- Apply Growth Factor Serum to clean, dry skin. Let it absorb.
- Apply Daily Power Defense over it, face and neck.
- Moisturise if you use one.
- In the morning, finish with a broad-spectrum sunscreen.
One change at a time. If you are adding both serums to a routine, introduce one, give it a few weeks, then add the second. It makes it far easier to tell what is working and what is not agreeing with your skin.
If you are building a ZO routine from scratch rather than adding to one, start with our step-by-step ZO routine for beginners, which covers the cleansing and toning steps that come before either of these serums.
Where retinol fits
Neither of these is a substitute for a dedicated retinol, and neither is a reason to skip one. If retinol is part of your routine, it goes in at night, and Daily Power Defense is the barrier support that sits alongside it.
If you are working out which strength to start on, our fall retinol reset guide walks through the strength ladder across the brands we carry.
We are an authorized Canadian retailer of ZO Skin Health. Free shipping on orders $99+, and samples with every order.
Shop ZO Skin HealthFrequently asked questions
Should I use Daily Power Defense or Growth Factor Serum?
Daily Power Defense if you are starting out or your skin needs barrier support. It is the foundation step in a ZO routine and is used twice daily. Growth Factor Serum if the look of expression lines and firmness is your main concern and your daily basics are already in place. Many routines use both.
Can I use Daily Power Defense and Growth Factor Serum together?
Yes. Apply Growth Factor Serum first on clean skin, let it absorb, then apply Daily Power Defense over it. Moisturiser follows, and sunscreen finishes the morning routine.
Which goes on first, Daily Power Defense or Growth Factor Serum?
Growth Factor Serum goes on first. It is the lighter gel texture, and the rule for layering is thinnest to thickest.
Is Daily Power Defense used morning or night?
Both. It is a twice-daily product, applied to clean skin after any lighter serums.
What size Daily Power Defense should I buy?
The 30 ml is $145 and the 50 ml is $230. If you already know the product suits you and you are using it twice daily on face and neck, the 50 ml works out better per millilitre.
Can I use Growth Factor Serum with a retinol?
Many routines pair a growth factor serum in the morning with a retinol at night. If your skin is sensitive or either product is new to you, introduce them one at a time and speak with your skincare professional.
Where can I buy authentic ZO Skin Health in Canada?
From an authorized Canadian retailer. Your Skin Solution is an authorized ZO Skin Health retailer, with free shipping on orders over $99 within Canada.
Product positioning, textures and directions are as published by ZO Skin Health. Prices are current as of 3 September 2026 and may change. Descriptions refer to visible, cosmetic change. Individual results vary. This article is general information, not medical advice. Speak with your dermatologist or skincare professional about what suits your skin.