If you live somewhere with strong sun, your skin lives a different life to skin in a mild climate. That is worth thinking about when you choose a vitamin C serum.
Why antioxidants and sun exposure go together
Sun-exposed skin deals with more daily environmental stress. Vitamin C is valued precisely because it is an antioxidant, which means it helps support skin against that everyday stress. This is not a sunscreen and it is not a substitute for one. Think of it as a supporting step in a routine, not a shield.
To be clear, nothing replaces proper sun protection. Sunscreen does that job. A vitamin C serum sits alongside it as part of a considered daily routine, applied underneath it in the morning.
Built for a harsh climate
Most vitamin C serums are formulated for mild, overcast markets and shipped everywhere else. Kessine started from a different place. It is made in Australia, built around Australian native botanicals that evolved in one of the sunniest environments on earth.
Kakadu Plum, the fruit at the centre of Kessine, thrives in exactly those conditions. There is a quiet logic to reaching for a botanical that comes from the same kind of climate your skin has to handle.
Why the form of vitamin C matters
Not all vitamin C is the same, and the difference matters more than the percentage on the front of the bottle.
Pure L-Ascorbic Acid is the best known form. It is potent and well studied, but it is unstable: it oxidises when it meets air and light, which is why so many serums arrive clear and end up amber. It can also feel strong on skin that reacts easily.
Kessine uses Sodium Ascorbyl Phosphate instead, a stable derivative of vitamin C. It does not oxidise the same way, so the serum keeps its colour and clarity for longer, and it is the gentler of the two forms. That combination of stable and gentle is what makes it suited to daily use in a hot, bright climate where a bottle sits in a bathroom for months.
If your skin reacts easily
Sensitive skin and strong sun are an awkward pairing, because the routines that suit a reactive complexion are often the ones people abandon in summer.
Kessine is fragrance-free, which removes one of the most common sources of irritation in skincare, and the gentler form of vitamin C is a deliberate choice rather than a cost decision. The full INCI ingredient list is published on the product page, so if you avoid a specific ingredient you can check the entire formula before you buy rather than asking for it. Patch test before first use, and if you have specific skin concerns, check with your health professional.
What is in it
Kessine pairs three Australian native botanicals, Kakadu Plum, Davidson Plum and Rosella, with Sodium Ascorbyl Phosphate, a stable form of vitamin C. The formula is fragrance-free, vegan-friendly and cruelty-free, which keeps it simple and lets the ingredients do the work.
A simple daily step
Two to three drops on clean skin, morning and evening. In the morning it sits under your moisturiser and sunscreen. Used consistently, it helps skin look fresher and brighter over time.
If you have been looking for a vitamin C serum that was actually built with a harsh, sunny climate in mind, rather than adapted to one, Kessine is made for exactly that.
Common questions
Does vitamin C serum replace sunscreen?
No. This is not a sunscreen and it is not a substitute for one. Nothing replaces proper sun protection, and sunscreen does that job. A vitamin C serum sits alongside it as a supporting step in a daily routine.
Is vitamin C serum good for sensitive skin?
It depends on the form of vitamin C. Pure L-Ascorbic Acid is potent but can feel strong on reactive skin. Sodium Ascorbyl Phosphate, the form in Kessine, is one of the gentler options, and Kessine is fragrance-free, which helps if your skin reacts easily. Patch test before first use.
What is Sodium Ascorbyl Phosphate?
It is a stable derivative of vitamin C. Unlike pure L-Ascorbic Acid, it does not oxidise readily when it meets air and light, so the serum stays clear and pale for longer instead of turning yellow or brown on the shelf. It is also the gentler of the two forms.
Can I wear vitamin C serum under sunscreen?
Yes. Apply the serum to clean skin, let it settle, then moisturiser, then sunscreen last. The serum goes underneath because it is the lighter product, and sunscreen should always be the final layer in the morning.
Is Kessine made in Australia?
Yes. Kessine is made in Australia by Eagle Reborn PTY LTD, and it is formulated around three Australian native botanicals: Kakadu Plum, Davidson Plum and Rosella.