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Secret Weapon Serum - Original - Normal and Dry/Sensitive Skin


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The Secret Weapon Original Serum is a 2023, 22,21,20 Beauty Shortlist award-winning product. It is a double serum that supports normal, dehydrated, sensitive skin. Wonderful for your natural skin barrier.

When you purchase your Serum, you are supporting Breast Cancer Charity, CoppaFeel!   We celebrate being official partners for four years.

As featured in YOU, Hello, Vogue, Millionair and many more magazines.    

When massaged into the Skin, the Serum works its "Magic" on the epidermis, supporting cell rejuvenation.

15ml will last for approximately 6 weeks, 30ml for 12 weeks. 

*Please be mindful that results will differ for each person as your Skin is individual to you.   

The Secret Weapon Original Serum is a 2021 Beauty Shortlist award-winning product. It is a double serum that works for normal, dehydrated, sensitive skin. It has become the go-to skincare for NHS and frontline workers when wearing PPE.

When massaged into the Skin, the Serum works its "Magic" on the epidermis, supporting cell rejuvenation.

*Please be mindful that results will differ for each person as your skin is individual to you.

11 Natural Ingredients

The product contains high concentrations of vegan oils that when combined are affective and instantly absorbed when applied.

Kate's journey of finding all natural skin remedies was about finding a serum to diminish the effects of her treatment, darkness, skin-ageing, lack of radiance, bringing back a glow, firmer skin and to reduce the appearance of fine lines. Secret Weapon Original was recreated to reflect her discovery selling all natural products under her private label.

The ingredients within the Secret Weapon Original Serum are combined to achieve a hydrating glow.

Amaranthus Caudatus Seed Oil
Improves elasticity and increases moisture. This important oil helps to maintain our youth and beauty.

Argan Oil
Its unsaturated fatty acids help soften skin by regulating sebum production and can help reduce acne.

High levels of gamma-linolenic acid (GLA) needed for development of healthy skin.

Camellia Oil
Natural anti-inflammatory and anti-microbial properties that help your skin recover without harsh chemicals and dryness.

Coconut Oil
Antimicrobial properties and high lauric acid content help protect against harmful microorganisms.

Evening Primrose Oil
The gamma-linolenic acid (GLA) content helps reduce skin inflammation and brings your fatty acid ratio into balance.

Jojoba Oil
Regulates sebum production, soothes and moisturises your skin without clogging pores.

Sea Buckthorn Oil
Helpful for inflammatory skin conditions like eczema, rosacea and even acne. This cherished "super fruit" is rich in antioxidants which protect from free radicals that cause skin damage and cancer.

Hydrating and anti-ageing treating your skin at a cellular level due to its molecular structure being so close to your own skin's.

Rosehip Oil
Its Vitamin A and linoleic acid content helps regulate sebum production reducing blackheads and whiteheads.

Vitamin E Oil - 5%
Fights off free radicals from the body, reducing wrinkles and keeps the skin youthful looking.

Charity Donation

Kate was a huge supporter of Coppafeel and was very passionate about their message. We are very proud to continue our support and be a small part of the incredible work they're able to complete.

Kate McIver Skin donates £1 for every 30ml Secret Weapon Original Serum and 50p for every 15ml Secret Weapon Original Serum sold to Coppafeel. We also donate £1 from the sale of our 7 Cleansing Cloths in a box to

Coppafeel are the first breast cancer charity in the UK to solely create awareness amongst young people, with the aim of instilling the knowledge and tools they need to get to know their bodies. They like to talk about a serious message in a light-hearted way, empowering people to start healthy habits for life.

The Kate McIver Secret Weapon Original Serum fits into your daily skincare routine with ease.

For best results, it is recommended to cleanse your skin with the Kate McIver Secret Weapon Cleansing Balm, then apply the Kate McIver Secret Weapon Hyaluronic Kakadu Serum prior to using the Kate McIver Secret Weapon Original Serum.

To use the Secret Weapon Original Serum, apply a few drops to a cleansed face, massaging in until it is fully absorbed. If you're unsure, use a tissue to blot any excess away. A serum will not sit on the surface like moisturisers.

*Please note - if you have not used this product previously, we advise you to patch test the serum for 24 hours before use. To do this, apply a couple of drops behind the ear. If irritation occurs, discontinue using the product.

Skincare without Alcohol, Perfume and Parabens.

11 Natural Ingredients - Caprylic Triglycerides, Oenothera Biennis (Evening Primrose) Oil, Squalane, Borago Officinalis (Borage) Seed Oil, Rosa Canina Seed Oil (Rose Oil), Tocopherol (Vitamin E), Camellia Japonica Seed Oil, Amaranthus Caudatus Seed Oil, Argania Spinosa Kernel Oil, Hippophae Rhamnoides Seed Oil, Simmondsia Chinensis (Jojoba) Seed Oil.



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 345 reviews
Daughter- In - Law Loves It

Bought for my daughter- in - law for Christmas, she loves it. One of the few products she can use without getting an allergic reaction!

Brenda Robb
A must have

I absolutely love this product. I've been using it for years on both my skin and hair. It leaves both feeling and looking amazing 😘


Leaves my skin feeling amazing. Would definitely recommend

Love this serum 💕

I absolutely love this serum! I have been using this for many many years now 💕 I have very dry, sensitive skin. This is the only serum out of many I have tried that doesn’t bring me out in blemishes or make me too oily. Would highly recommend it xx

Alexandra King
The weapon

Can’t live without this serum.. I’ve even tried other serums to save me money and I have to keep coming back to the same one… my skin screams out for this and I won’t be looking for others no more.