Search “best vitamin C serum” and you get a wall of confident answers, most of them selling you the one they want you to buy. This page does something duller and more useful. It lays out the vitamin C serums Australians actually search for, side by side, on the things that change how the serum feels and works, so you can see which one fits your skin and your routine.
We make one of them, so read us with that in mind. But everything below about the others comes straight from their own ingredient lists and product pages. No spin, no knocking anyone. Different serums suit different people, and the honest answer to “which is best” is “best for what.”
New to vitamin C? Here is what to look for in a serum before you compare.
What actually makes vitamin C serums different?
Three things matter more than the number on the front of the bottle.
The form of vitamin C. This is the big one. Pure vitamin C, called L-Ascorbic Acid, is potent and well studied, but it is unstable. It oxidises when it meets air and light, which is why some serums turn amber over time, and it can feel stronger on sensitive skin. Derivative forms like Sodium Ascorbyl Phosphate are gentler and more stable on the shelf. Neither is “better” in the abstract. They suit different people.
How it feels to use. A serum you dread applying is a serum you stop using. Texture, sting, and scent decide whether a bottle gets finished or abandoned in a drawer.
Who it is built for. A clinical high-strength formula and a gentle daily one are answering different questions. Match the serum to your skin, not to someone else’s review.
How do the most-searched vitamin C serums in Australia compare?
Here are three of the serums Australians search for most, set next to each other. Prices are indicative Australian retail and move with sales.
| Serum | Form of vitamin C | Size and price | Feel | Suits |
|---|---|---|---|---|
| Kessine Kakadu Plum Vitamin C Serum | Sodium Ascorbyl Phosphate (gentle, stable) | 30ml, approx. $44.95 | Lightweight, fragrance-free, no sting | Sensitive skin and daily users who want vitamin C they will actually keep using |
| SkinCeuticals C E Ferulic | 15% L-Ascorbic Acid (pure) | 30ml, approx. $185 | Potent, clinical, can oxidise over time | People chasing maximum clinical strength and happy to pay for it |
| The Ordinary Vitamin C Suspension 23% | 23% L-Ascorbic Acid (pure) | 30ml, approx. $15 | High strength, slightly gritty texture | Tough skin on a tight budget |
Read across the row that sounds like you, not down the price column. The $185 serum is not a more expensive version of the $45 one. They are built for different people with different skin and different goals.
Where does Kessine fit?
Kessine is the gentle, everyday one.
We built it around Sodium Ascorbyl Phosphate, the gentle, stable form of vitamin C. It does not oxidise on the shelf the way L-Ascorbic Acid serums do, which is why the serum stays clear and pale rather than turning amber. It is fragrance-free, pH-balanced, and light enough to layer under moisturiser and SPF without residue.
The vitamin C sits alongside three Australian native botanicals, Kakadu Plum, Davidson Plum, and Rosella, chosen because they are rich in natural antioxidants, for brighter-looking skin. It is made in Australia, cruelty-free, and vegan-friendly.
Here is the honest positioning. If you want the highest-strength clinical hit and you tolerate strong actives, one of the L-Ascorbic Acid serums above may suit you better, and we would rather you find the right serum than the wrong one with our name on it. But if you have sensitive skin, or you have started a potent vitamin C before and quietly stopped because it stung or oxidised or just felt like a chore, Kessine is built for exactly that. A vitamin C you will actually enjoy using, made for the climate we live in.
Why does an Australian climate angle matter for vitamin C?
Australia has the highest UV exposure on earth. Most vitamin C serums on the shelf were formulated in Europe or California, for climates that are not ours. That was the question Kessine started with: why isn’t there a vitamin C serum built for the climate we actually live in? Native botanicals like Kakadu Plum grow in some of the harshest sun on the planet. Building a serum around them, here, is the whole point.
Frequently asked questions
Which vitamin C serum is best for sensitive skin in Australia?
Look for a gentle, stable derivative rather than pure L-Ascorbic Acid, which can feel stronger on sensitive skin. Sodium Ascorbyl Phosphate, the form in Kessine, is one of the gentler options and is fragrance-free, which helps if your skin reacts easily.
What is the difference between L-Ascorbic Acid and Sodium Ascorbyl Phosphate?
L-Ascorbic Acid is pure vitamin C. It is potent and well studied but unstable, so it can oxidise with air and light and may irritate sensitive skin. Sodium Ascorbyl Phosphate is a derivative that is gentler and more stable on the shelf. Different people do better on different forms.
Why do some vitamin C serums turn yellow or brown?
That colour change is oxidation, and it usually happens with L-Ascorbic Acid serums as they meet air over time. Stable-form serums like Kessine stay clear and pale for longer because Sodium Ascorbyl Phosphate does not oxidise the same way.
Is a more expensive vitamin C serum better?
Not automatically. Price often reflects the brand, the concentration, and the form, not how well a serum suits your skin. A gentler mid-priced serum you use every day will usually do more for you than a high-strength one you abandon.
Is Kessine made in Australia?
Yes. Kessine is made in Australia by Eagle Reborn PTY LTD, and it is formulated around Australian native botanicals: Kakadu Plum, Davidson Plum, and Rosella.
Where can I buy Kessine?
Kessine is available directly from kessine.com.au, and also on Amazon Australia.