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![[JAPAN VERSION]COSRX The Niacinamide 15 Serum 20ml](http://reiwatakiya.co.uk/cdn/shop/files/88095984546371_873a2994-5a7d-4cab-bc3d-708aa6826f3a.jpg?v=1758026423&width=1000)
[JAPAN VERSION]COSRX The Niacinamide 15 Serum 20ml
✅ UK Stock • Fast Delivery • 100% Authentic
100% Authentic
Fast UK Delivery
Limited stock
UK warehouse
A powerfully clarifying serum with 15% Niacinamide to visibly reduce excess oil, blemishes and the look of pores while brightening uneven tone.
Why You’ll Love It
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High-dose niacinamide for clarity and smooth texture
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Balancing partners (e.g., zinc PCA, N-acetyl glucosamine)
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Lightweight, non-sticky; layers under moisturiser/SPF
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Japan Version—JP label & instructions
Best Results
Start 3–4 times per week, then daily if tolerated. Avoid layering with strong acids/retinoids the same night when starting out. Use SPF daily.
Why Choose COSRX
Active-driven formulas that do exactly what they say—clearer skin, less faff.
Ingredients
How to use
Choose options
Frequently Asked Questions
Reiwatakiya is a global retailer specialising in authentic Japanese and Korean cosmetics, skincare, and lifestyle products. We are dedicated to bringing the best quality beauty and personal care items to our customers worldwide.
Yes! All of our products are 100% guaranteed authentic. We source directly from reputable Japanese and Korean brands, ensuring that you receive genuine, high-quality products every time you shop with us.
Yes! We have two stores in London, where you can explore our products in person and receive expert advice from our friendly staff. Feel free to pop in and say hi!
📍 London Store Locations:
- Bond Street: Find us here
- Chinatown: Find us here
We currently ship across the UK only.
- Standard Shipping: £4.99
- Free Shipping: Orders over £36 qualify for free shipping.
- Delivery Time: Your order will arrive within 3-5 business days.
We offer a 14-day return policy under the following conditions:
- Return Window: Items must be returned within 14 days from the date of purchase.
- Condition of Items: Products must be brand new, unopened, and in their original packaging. Due to hygiene reasons, we cannot accept returns of opened or used items.
- Proof of Purchase: A receipt or proof of purchase is required for all returns.
If you receive a damaged or incorrect product, please contact our customer service within 48 hours of receiving your order. We’ll be happy to assist with a replacement or refund where applicable.
We accept all major credit/debit cards and other secure payment methods. Visit our website checkout page for full details on accepted payment options.
Yes! Once your order has been dispatched, you’ll receive a tracking number via email, allowing you to monitor your delivery status.
At the moment, we primarily serve customers in the UK. If you're outside the UK, please check our website or contact customer support for international shipping inquiries.
For any inquiries, feel free to reach out via:
📧 Email: info@reiwatakiya.co.uk
📍 Visit Us: Stop by one of our London stores for in-person assistance!