The recovery power of an oil, the efficacy of a serum.

Heal visible signs of time with Serum in Oil. The nourishing power of rare sea oil ulkenia is inf ... Read more

Discontinued product

We regret to inform you that this product has been discontinued

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Heal visible signs of time with Serum in Oil. The nourishing power of rare sea oil ulkenia is infused with pure algae-oil. So similar to our cellular structure that it instantly fuses with the skin. For the first time, Biotherm has succeeded in uniting a serum with an oil in one micro-dispersion formula that transforms under the fingers. This non-greasy and non-sticky night care is suitable for All Skin Types. Night after night, skin is visibly re-plumped, velvet-smooth and luminous, as if transformed.
After 4 weeks, Blue Therapy serum-in-oil delivers benefits on the look of fine lines, bounce and radiance.

A luxurious oil texture that quickly fuses with the skin and works to improve skin texture. Supple, rich & non sticky the texture has been specially adapted to be easily massaged into the skin.

Apply every evening on a cleansed face and neck. Using both hands, smooth over the face in an outward pattern starting from the centre.
Finish by the neck. Avoid eye contour area

Blue Therapy Serum in Oil acts immediately on finelines while replenishing skin's moisture to a soothing feeling.
Proven results after 4 weeks, women agreed:

  • 67% of women said serum-in-oil transformed their skin quality
  • skin looked smoother, brighter for 69%
  • skin looks more luminous for 84%
  • complexion radiance looks revived for 86%
  • complexion looks more even for 80%
  • skin texture looks refined for 84%
  • fine lines look reduced for 57%
  • skin looks re-plumped for 73%.

Clinical study, 50 women

Biotherm products contains no parabens, no fragrance allergens and are enriched with Life Plankton™, pure thermal plankton extract that contains 35 nutrients, proteins, vitamins, amino acids, glucids, lipids and trace elements that help revive the skin’s vital functions and which are essential to its health.

. with marine connectum, a nutrient-rich sea sugar that survives in the saltiest level i nthe sea. its self-regenerating capabilities instantly smoothes the skin surface to reinforces the skin barrier, boost the natural synthesis of crucial lipids & proteoglycans and recreates the ideal skin cohesion for better nutrient exchanges. with life plankton™ aqua, a proprietary biotherm ingredient sourced from the french pyrenees and is the most unique and regenerating ingredient in the cosmetic industry. it contains 35 nutrients, proteins, vitamins, amino acids, glucids, lipids and trace elements that help revive the skin’s vital functions and which are essential to its health.

*Please be aware that ingredient lists may change or vary from time to time. Please refer to the ingredient list on the product package you receive for the most up to date list of ingredients.


Shipping is free (USPS Ground-Most orders will be delivered within 7-12 business days) with an order of $50 and more before tax. ships via USPS to US addresses only, including Alaska, Puerto Rico, US Virgin Islands, Hawaii, and military APO/FPO destinations. Biotherm will not ship to any International Shipping Services such as DHL Borderlinx, VPost or comGateway. Orders shipping to Alaska, Hawaii, Puerto Rico, US Virgin Islands, military APO/FPO destinations or US territories can only be shipped through standard shipping mode and will take up to 30 days.

If for any reason you are not completely satisfied with your Biotherm purchase, please contact our customer service at 1-888-BIOTHERM (Monday to Friday 9:00 am to 5:00 pm Eastern Time) and simply return the purchased products within thirty (30) days of the delivery. Please note that all promotional products, including free samples and gift with purchases, must be returned. We will be happy to credit your account for the amount of the purchase. Refunds will be issued within 30 days in the form of credit to the credit card holder. You will receive an email when the credit is processed.



221 South 10th St.
Lemoyne, PA 17043


We recommend that you return all products unopened and in the same condition in which they were delivered and that you send your return via USPS for your protection and to insure prompt delivery. We're sorry, but return shipping fees are not refundable.


If your package was damaged in shipment by the carrier, and its content rendered unusable, save the box and the merchandise and notify us immediately at 1-888-BIOTHERM (Monday to Friday 9:00 am to 5:00 pm Eastern Time). The carrier will be notified and the damaged package will be replaced.

Rated 5 out of 5 by from This product brought me back to biotherm Used many other brand products. And I tried purchasing biotherm serum again. my skin after a few days got brighter, shiny, hydrated and the cleaned pores. It works better than any brand's expensive beauty solution. If you got this serum, you will not regret it.
Date published: 2019-02-16
Rated 5 out of 5 by from The best of the best! First time I use this serum I have to say is amazing I’m very happy to put it on my skin. A luxury serum that Biotherm brings for us, excellent rich texture and smell nice, you must try it.
Date published: 2019-01-06
Rated 5 out of 5 by from excellent, just what I need This is the best serum I have tried over the years. Moisturizing and not irritating my eyes.
Date published: 2018-09-01
Rated 5 out of 5 by from Not just any other luxury skincare boasting its global fame. This stuff actually shows results right from the first application. My skin has a natural glow and firmness now. Can’t ever switch to any other brand after using this.
Date published: 2018-08-25
Rated 5 out of 5 by from Using less foundation because of this serum! Thanks to Youtube, it was brought to my attention that I was missing a serum in my skincare routine (as if 6 products wasn't enough!). I shopped around and was always curious about Biotherm. It's unique compared other skincare brands. I have been using this serum for 3 months and it has done so much for my skin. Scars heal faster and I use less foundation on my face. I want to say that it's because of this product since this is the only new brand of skincare product I've added to my skincare routine. I have been using my current brand for the past 5 years. Unfortunately, I'm not confident enough to change my entire skincare brand to biotherm because it's so difficult to get in the US. Pros: Skin looks brighter and smoother. Scars fade quickly. Minimized my nose pores. Cons: The smell is different from what I'm used to in skincare products. Unfortunately this small bottle only lasted 3 months. Perhaps that's a long time? I'm not sure, this is the first serum I have bought. I'm going to try a different brand's serum/oil for the next few months and perhaps I'll come back to Biotherm!! I want Biotherm to become more popular so more stores stock it!
Date published: 2016-12-05
Rated 5 out of 5 by from Excellent This product is amazing! This serum is not oily at all. Helps with wrinkles, and makes my skin so soft. I have been using Biotherm for years, and this is my favourite product at this time.
Date published: 2016-02-09
Rated 5 out of 5 by from Feels great on This serum feels absolutely great. Lasts a lot longer than I thought it would.
Date published: 2014-03-24
Rated 5 out of 5 by from love it! it is very effective and almost weightless - it feels so smooth and light when it's on. it never leaves my skin itchy or clogged and does what it promises.
Date published: 2014-02-19
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