Experience Nature's Healing Water of Japan

Patented skin-revitalising serum formula from the rare Moor Onsen of Hokkaido.
Try Biyusen™ today.

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Get your FREE 7-day serum trial kit

Free $0.00! Just pay for shipping.

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FROM ONSEN TO OUR LABS

Working with leading scientists, we discovered a fermentation process that transforms moor onsen water into an organic compound of skin-renewing acids called BIYUSEN™. This complex is clinically proven to restore skin to its healthiest state.

Fulvic acid

Enhances your skin’s natural defense mechanism as it is a powerful anti-oxidant. It also helps the absorption of oxygen and water.

Humic acid

Lengthens the life of hyaluronic acid molecules. This keeps the skin’s moisture level as high as possible and slows down wrinkle formation.

Hymatomelanic acid

Smooths and heals skin texture and accelerates the healing of superficial micro-wounds as well as cell renewal.

Award-winning Bestsellers

World's First Custom Serums
Made from Onsen

Experience Biyusen™ in our best-selling serums customised for your skin’s unique needs.

“A personalised high-performance skincare solution unique to every complexion is freely yours to experience.”

Proven Results

Clinical and User Trials

Our supercharged serums with our miracle ingredient BIYUSEN™ are put through vigorous testing to ensure the highest levels of efficacy.

100% agree skin feels softer, smoother and more supple
97% agree skin feels instantly hydrated with a healthy, radiant glow
94% agree skin looks firmer, lifted and feels more elastic

Visible Results After 28 Days

Based on a 4-week clinical trial of 35 subjects aged 21 - 59

7 Serums Customised for Your Skin

There’s no such thing as a one-size-fits-all solution to our varying skin concerns. That's why we formulate personalized solutions for every possible skin concern and ensure that you have a product that’s suitable for you—evaluated, tested, and researched by our dermatologist.

There’s no such thing as a one-size-fits-all solution to our varying skin concerns. That's why we formulate personalized solutions for every possible skin concern and ensure that you have a product that’s suitable for you—evaluated, tested, and researched by our dermatologist.

Healthy Glowy Skin Starts Here

⭐⭐⭐⭐⭐ 4.7/5 (800+ happy customers)

FAQs

How does the trial work?

Simply enter your email and proceed to claim your free mini-sized serum of choice. You will be led to the checkout page to enter your shipping details. All you need to pay for is the shipping fee and you're set to receive your trial serum.

Have more questions? Email us directly at shop@irenshizen.com and we'll reply within 3 working days.

How long should the trial serum last?

Most customers get 1-2 weeks of use. Depending on recommended use frequency, some products may last longer than others. Our recommend use: Once in the morning and once at night after cleansing or/and toning face.

Do I receive special perks?

Definitely. If you've signed up to claim your free 7-day serum trial, you'll also receive a special discount code to purchase our full-sized serums at 10% off.

Have more questions? Email us directly at shop@irenshizen.com and we'll reply ASAP.

Is this a subscription?

Our serum trial is not a subscription box. It is a one-time purchase to sample our serum.

Are your products safe for sensitive skin?

We do not use any ingredients that are toxic, comedogenic or harmful to your skin. We have blacklisted more than 2000 "toxic" ingredients and base our formulations on factual evidence, using natural botanicals and plant-based actives as our primary formulation. 

Are your products vegan / tested on animals?

All our products are certified vegan and creulty-free. We do not use ingredients derived from animals, nor do we/our chain of production, conduct any animal-testing.