Frequently asked questions

What is ONE?

ONE is K-DERMLAB’s multi-active daily serum, formulated with 10% niacinamide, sodium hyaluronate, hydrating humectants, chamomile and allantoin.

It was created for a simple reason: skincare doesn’t need to feel complicated.

One serum. Morning and night. Less to think about.

What does ONE do?

ONE is designed to support hydration, a more even-looking complexion, the appearance of pores and the skin’s natural barrier.

Its 10% niacinamide formula is complemented by sodium hyaluronate and humectants for hydration, alongside chamomile and allantoin.

How do I use ONE?

Keep it simple.

Morning: Apply a pea-sized amount of ONE to your face and neck, followed by your moisturiser and SPF.

Evening: Apply ONE after cleansing, followed by moisturiser if needed.

Gently press or tap the serum into the skin until absorbed.

Can I use ONE morning and night?

Yes. ONE is designed to fit easily into both your morning and evening skincare routine.

AM + PM. That’s it.

Does ONE replace my moisturiser?

ONE is a serum, not a moisturiser.

Depending on your skin type and how your skin feels, you may still want to follow ONE with a moisturiser, particularly if your skin tends to be dry.

During the day, complete your routine with an appropriate SPF.

What skin types is ONE suitable for?

ONE is suitable for all skin types.

If your skin is particularly sensitive or reactive, we recommend introducing new skincare gradually and patch testing before first use.

Everyone’s skin is different, so discontinue use if irritation occurs.

Is ONE suitable for sensitive skin?

ONE is fragrance-free and contains ingredients including chamomile and allantoin.

However, sensitive skin varies considerably from person to person. If you have sensitive or reactive skin, patch test ONE before first use and introduce it gradually.

Can ONE treat acne?

ONE is a cosmetic skincare serum and is not an acne treatment.

It contains 10% niacinamide and is designed to support the appearance of balanced, hydrated and even-looking skin, but it is not intended to diagnose, treat, cure or prevent acne or any other medical condition.

For persistent or significant skin concerns, seek advice from an appropriate healthcare professional.

How much should I use?

A little goes a long way.

Apply approximately a pea-sized amount to the face and neck using gentle tapping or pressing motions.

How big is ONE?

Each bottle contains 1 fl oz / 30 ml of serum.

How long a bottle lasts will depend on how much you use and how frequently you apply it.

Is ONE fragrance-free?

Yes. ONE is fragrance-free.

The formula is also made without parabens, silicones, sulfates, phthalates or mineral oil.

Is ONE cruelty-free?

Yes. ONE is presented by our manufacturer as cruelty-free.

Where is ONE made?

ONE is manufactured in the USA.

When will my order arrive?

Available shipping options and estimated delivery information will be provided at checkout.

Once your order has been dispatched, tracking information will be provided where available.

For full details, please see our Shipping Policy.

What if my order arrives damaged or incorrect?

Contact K-DERMLAB as soon as possible with your order number and clear photographs of the product and packaging.

We’ll review the issue and, where the claim is approved, arrange an appropriate replacement or refund.

Please see our Refund & Replacement Policy for full details.

Can I return ONE if I change my mind?

Because ONE is a personal care and skincare product, we do not accept general returns for change of mind.

Damaged, defective, incorrect or qualifying missing orders are handled under our Refund & Replacement Policy.

How can I contact K-DERMLAB?

For product or order enquiries, contact:

[NEW K-DERMLAB EMAIL]

We aim to keep skincare uncomplicated — so if you’re unsure about something, ask us.