Authorised stockist
Definisse [KP1] Regenerating Serum
KP1 peptide and white truffle serum for lines and dullness
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Description
Definisse [KP1] Regenerating Serum from RELIFE is a concentrated, fast-absorbing serum with the exclusive [KP1] collagen-modulator peptide, fragrance-free white truffle extract to improve skin elasticity with a smoothing effect, niacinamide, high and very-low molecular weight hyaluronic acids and vitamin B5.
It delivers immediate and long-lasting hydration for luminous, velvety-smooth skin. In the brand's clinical study, skin showed significant improvements in crow's feet, hydration, elasticity and roughness after four weeks.
Who it's for: dull skin with fine lines and wrinkles, and as home care alongside aesthetic treatments.
Before you use
- Patch test 24–48 hours before first use, especially if you have sensitive skin or allergies.
- For external use only. Avoid the eyes and stop use if irritation occurs.
- Follow the directions on the pack.
Benefits
• White truffle extract improves elasticity
• Immediate, long-lasting hydration
• Brand clinical study: improved crow's feet and elasticity in 4 weeks
Key Ingredients
Full ingredient list: printed on the product pack. We are confirming the complete list with the brand and will show it here. If you have allergies, please contact us before ordering and we will check the pack for you.
How to Use
Best For
In stock — FREE next working day delivery when you order before 3PM
Clinic-approved
Clinical Favourites
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Buy with total confidence
You know the brand. Here's why to trust the source.
Medical-grade skincare is only as good as where it comes from. Celsia Skin is an authorised UK stockist with genuine clinical oversight — so what reaches you is the real product, used the right way.
100% genuine — guaranteed
Every Celsia order is sourced directly through brand-approved channels, sealed and authentic — never grey-market or counterfeit. If anything you receive isn't genuine, we'll put it right with a full refund.
Authorised & authentic
An authorised UK stockist of ZO Skin Health and other professional ranges. Approved supply chain, full traceability and sealed packaging on every order.
Expert oversight, included
Qualified skin professionals review orders and gate higher-strength actives for your safety — guidance most online resellers simply don't provide.
Protected & looked after
Secure encrypted checkout, discreet tracked UK delivery and genuine aftercare. Questions before or after you buy — our team is one message away.
- Genuine guaranteed
- Authorised stockist
- Expert-reviewed dispatch
- Secure checkout
- Tracked & discreet UK delivery
- Easy returns
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Questions before you buy?
Buying with confidence
The things customers most want to know before ordering medical-grade skincare online.
Are your products genuine?
Yes — without exception. Celsia Skin sources every product directly through brand-approved channels, so what you receive is the authentic, sealed item — never grey-market, decanted or counterfeit. We stand behind this with a full-refund genuineness guarantee.
Are you an authorised stockist of Definisse?
We are an authorised UK stockist of ZO Skin Health and other professional, medical-grade brands. It's precisely because these are clinical-strength ranges that some products are consultation-only — authorised stockists are expected to provide suitable guidance, not just sell.
Why are some products consultation-only?
Medical-grade actives can be unsuitable for some skin types or conditions. Gating them behind a free, expert-reviewed assessment keeps you safe and helps you get results rather than irritation.
How will my order arrive?
Orders are dispatched in discreet, unbranded packaging via tracked UK delivery, with FREE next-working-day delivery on all orders. You'll receive tracking by email so you can follow it to your door.
Can I return it if it isn't right for me?
Unopened items can be returned within 14 days of delivery for a refund. For hygiene reasons, opened skincare can't always be resold — do reach out and we'll help find the right alternative.
Can I get advice before I commit?
Absolutely. Our free online consultation pairs you with a qualified professional who'll confirm whether this product suits your skin and goals before you spend a penny. You can also message our team directly with any question.
Still unsure? Message our team before you order.
About Definisse — Definisse [KP1] Regenerating Serum
Definisse [KP1] Regenerating Serum is a professional-grade skincare product by Definisse, available from Celsia Skin — a UK-authorised stockist of medical-grade skincare brands. Definisse formulas are developed to clinical standards, with active ingredients at concentrations that deliver measurable results.
At Celsia Skin, every product is sourced through brand-approved channels and dispatched with expert guidance. Some products in the Definisse range require a free consultation before purchase to ensure they're appropriate for your skin type and goals. This protects both your skin health and your investment.
Browse the full Celsia range, shop all Definisse products, or start a free consultation to receive a personalised prescription routine from our qualified skin professionals.
