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Secret Weapon Hyaluronic Kakadu Serum


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We are proud of the Hyaluronic Kakadu serum, which has outstanding multifunctional active ingredients for youthful, radiant skin, which induces outstanding results transforming the appearance of dull, tired and dehydrated skin.  All backed up by Clinical data.

Anti-ageing - Moisturising - Pro-Collagen


Two results-driven ingredients brought together to Illuminate your skin, Protect and Reinforce the dermis for a beautiful skin aspect. Extracted from Kakadu Plum, the world’s highest Vitamin C source and a Hyaluronic Acid with a mixed molecular weight of low, medium and high molecules will improve skin radiance & boosts skin luminosity.

Kakadu Plum ingredient has been clinically proven to after 1 month:

- Reduce wrinkle volume by 41%
- Reduce wrinkle length by 39%
- Boosts skin tone and evenness by 14%
- Reduces skin redness by 2.2%
- Boosts skin brightness by 1.7%

After 24 hours:

- Increases Antioxidant activity by 79%
- Boosts New Collagen Synthesis by 144%
- Stimulates Vitamin C by 106%

After 15 days:

- Skin radiance enhancement +21%

After 30 days:

- Skin radiance enhancement +30%

- 100% of the subjects demonstrated a positive effect

If you want a high performing product that induces skin brightening, reduces wrinkles and skin luminosity, this product is for you.

Kakadu Plum

100 X more in Vitamin C content - Australian Superfruit extracted from the world’s richest source of vitamin C. Protects and reinforces the dermis to reduce the appearance of ageing signs.


With a mixed molecular weight spectrum of low, medium and high molecular weight the ingredient will achieve the following results:

- Better permeation than low and high HA used separately
- Enhances permeability of water-soluble actives
- Enhances permeability of oil/lipo soluble actives - great to apply before Secret Weapon Serum
- Enhances hydration and moisturisation - hydration is maintained after 2 hours and therefore a fantastic moisturiser
- Protects against short term dehydration
- Increases skin elasticity
- Increases skin smoothness
- Short term reduction in wrinkles by approx 7% at 30 minutes and 3% at 4 hours
- A decrease in wrinkle volume

Why is Kakadu Plum extract great for Acne?

Vitamin C clears skin redness. One of the most observable effects of using a product with Vitamin C when dealing with acne is its ability to reduce skin inflammation and redness. It also strengthens the tiniest of blood vessels - the capillaries. Capillaries are almost microscopic but crucial. They are in charge of bringing precious nutrients and oxygen to even the deepest levels of the skin. It is these basal layers of skin cells that cause most of the redness on our face. Vitamin C makes the blood vessels' walls stronger and reduces the instances of micro-bleeding, thereby making your skin look less red and inflamed.

Splash your face with cold water, leaving your skin slightly damp. Gently smooth 5 drops of Kate McIver Secret Weapon Hyaluronic Kakadu Serum over your face and décolletage until it is fully absorbed. For best results, precede with Secret Weapon Cleansing Balm to fully clean and exfoliate your skin. Follow with your preferred Secret Weapon Serum to seal the hydration of the Secret Weapon Hyaluronic Serum.

Water - Aqua, Glycerin, Sodium Hyaluronate - Sodium Hyaluronate,  Phenoxyethanol and ethylhexylglycerin, Terminalia Ferdinandiana Fruit Extract, Aqua, Glycerin, Sodium Hyaluronate (mix of molecular weights-only 'sodium hyaluronate')



UK orders received by 12pm, Monday to Friday, will be dispatched the same day. Orders received after 12pm, at a weekend or on a Bank Holiday will be dispatched the following working day. Please find delivery timescales and prices in the table below:

European Union (EU)

Kate McIver Skin is registered for Import One-Stop Shop (IOSS), which means the correct amount of VAT for the destination (the buyer's) country will be collected at the point of sale and will be paid to the relevant EU Tax Authorities, by us, so there will be no additional or unexpected costs to you upon delivery.

IOSS is applicable for consignments not exceeding €150, inclusive of any shipping fee. If your order exceeds this amount, there may be additional shipping fees to pay. A member of our team will contact you on the details you provide at the point of sale to arrange this.

Shipping costs for each country within the EU can be found in the table below. We will share the shipping fees with you, based on your store spend:

EU shipping rates


Rest of World

For destinations outside of the UK and EU, our policy is to ship DDU (Delivery Duties Unpaid), therefore you may be subject to additional import duties and taxes, which are levied once the order reaches the specified destination. Any additional charges for customs clearance must be borne by you. Contact your local customs office for further information.

Please find shipping costs for other countries around the world in the table below:

Rest of world shipping rates


We hope that you love your Kate McIver Skin order, however, if for some reason you’re not satisfied, we offer a 30 day money back guarantee post your purchase date. If your skin were to react, it would be within this timeframe.

You must log any concerns via email to For the full T&Cs, please go to our Returns Policy.

Customer Reviews

Based on 75 reviews
Holly Ellison
Wow this is my go to serum!

I always worry about serums adding too much oil with having spot prone skin but this product is a little miracle in a bottle! I love Kate Mckiver products!! X

Wilma Mcdonald

My skin is so taught/dry started using this product every morning and feel as tho it’s a lot better .. my daughter commented on how good my skin was looking so must working


I'm on my 4th bottle of this now- so glad I added it to my routine!
I use it every evening before the Original Serum, and wouldn't be without it!

Sharon Mctaggart
Biggest wow

Really amazing results.just after a couple of use’ skin is looking firmer more radiant.worth every penny.

Catherine Smith

Just one of the amazing products from your range.
I use this alongside the Cleansing balm and Original Serum, my skin has gone from being dull to glowy, I get compliments on how lovely my skin is, I absolutely love it xx