Klara's
Pep-Stem Yellow Serum
Argireline® & Collagen Peptides in a Biomimetic Delivery System Targeted support for mature skin (50+)
A concentrated peptide serum combining Argireline®, collagen peptides, and plant stem cell extract within a biomimetic formulation framework developed by Dr Klara Valko, pharmaceutical scientist and Honorary Professor at UCL School of Pharmacy.
Designed for skin showing visible expression lines, loss of firmness, and reduced radiance, this lightweight serum complements Klara’s Day and Night Creams by delivering focused peptide support and hydration.
Supporting Actives
Phytocelltec™ Malus Domestica (Apple Stem Cell Extract)
Supports skin vitality.
Niacinamide & Panthenol
Help maintain even tone and support the skin barrier.
Hyaluronic Acid
Enhances surface hydration and visible plumpness.
Botanical Antioxidants (Sea Buckthorn, Rosemary, Lotus)
Provide environmental support.
Hyaluronic Acid & Hydrolysed Collagen
Provide surface hydration and visible plumpness.
Sea Buckthorn & Botanical Antioxidants
Support protection against environmental stress.
Key Benefits
• Helps improve the appearance of fine lines
• Supports smoother, firmer-looking skin
• Enhances hydration and radiance
• Lightweight, fast-absorbing texture
• Suitable for mature or dehydrated skin
Molecular Evaluation
The formulation was evaluated in vitro by Makrolife GmbH using human macrophage gene expression analysis. Results indicated modulation of pathways associated with inflammatory balance and angiogenesis-related signalling, supporting the biological activity profile of the peptide complex.
These findings are consistent with the formulation’s intended role in supporting skin vitality and visible resilience.
How to Use
Apply 1–2 pumps to cleansed skin morning and evening.
Gently pat into face and neck.
Follow with Klara’s Day or Night Cream.
Designed for Intelligent Ageing
A peptide-focused serum developed with scientific precision — not exaggerated claims.
Full ingredient list: Aqua, Rosa Damascena Flower Water, Cucumis Sativus Juice, Acetyl Hexapeptide-3, Aloe Barbadensis Leaf Juice Powder, Malus Domestica Fruit Cell Culture Extract, Xanthan Gum, Glycerin, Phenoxyethanol, Lecithin, Sodium Levulinate, Sodium Anisate, Steareth-20, N-Hydroxysuccinimide, Chrysin, Palmitoyl Oligopeptide, Palmitoyl Tetrapeptide-7, Propylene Glycol, Benzyl Alcohol, Salicylic Acid, Sorbic Acid, Hydrolysed Collagen, Niacinamide, Chondrus Crispus Powder, Algin, Panthenol, Sodium Ascorbyl Phosphate, Hyaluronic Acid, Lotus Essential Oil, Hippophae Rhamnoides Fruit Extract, Helianthus Annuus (Sunflower) Seed Oil, Rosmarinus Officinalis Leaf Extract, Sodium Phytate, Citric Acid.
We offer Free UK Delivery on all orders over £100.
Otherwise, the shipping cost in the UK is £3.99.
Orders to the UK will take 1-2 working days after dispatch.
We aim to dispatch your order within 24 hours. Orders placed on a Friday afternoon will be dispatched on Monday. Please note, UK Public Holidays may delay dispatch by up to one day.
Within the UK we use Royal Mail 1st Class, Tracked 24 or Tracked 48 services depending on the value of the order.
We shall provide a tracking number and expected delivery date upon dispatch.
Shipping cost to Europe is £14.99 and delivery may take up to 11 working days after dispatch.
Shipping cost to the Rest of the World is £23.99 and delivery may take up to 17 working days after dispatch.
We offer Free Local Pickup on any order from our laboratory in Stevenage, Hertfordshire.
Simply select Pickup as your delivery option at the checkout.
Our opening times are as follows:
Monday - Friday
10am - 6pm
Saturday - Sunday
12pm - 5pm
For more information about our laboratory and how to find us, click here.
We hope that you are delighted with your order. However, suppose for any reason you are not entirely satisfied or you otherwise wish to cancel your order. In that case, you may return any item in its original condition for a refund within 14 working days from delivery.
If you wish to return your order, send an email to hello@klaraskincare.com.
Click here for more information about our returns policy.
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