Brand reviews - BeautyDecoded analysis
Biotherm.
Biotherm Reviews analysis by a doctor
French brand founded in 1952 in Molitg-les-Bains. Six products analyzed across five ranges - Blue Therapy Pro-Rétinol, Waterlover, Life Plankton, Aquasource - with their BeautyDecoded scores and real user feedback.
6
Products analyzed
8
User reviews
4,21
Average score /5
1952
Brand created
Further information
Analyze a Biotherm product on your skin profile.
The BeautyDecoded application lets you scan any cosmetic product to visualize its suitability for your skin type and needs, based on INCI analysis.
What sets the brand apart
From Pyrenean thermal plankton marine biotechnology.
French brand founded in 1952 in Molitg-les-Bains in the Pyrenees by Dr Jos Jullien (hydrobiologist), Georges and Jeanine Marissal. Its founding asset: the Thermal Plankton from Pyrenean thermal springs - a micro-organism rich in 35 nutrients (vitamins, amino acids, lipids) with documented regenerating properties. Acquired by L'Oréal (Luxury division), Biotherm manufactures in France with 30 years of research, 11 scientific publications and 8 active patents.
01
The Biotech Plankton™ - sustainable biotechnology
Since 2007, Plankton de Vie has been reproduced in the laboratory by fermogenesis - allowing sustainable production without drawing on natural sources. Over 35 essential nutrients (proteins, vitamins A, B, C, E, amino acids, carbohydrates, lipids, trace elements) with documented activity on epidermal cell regeneration.
02
Blue Beauty - ocean commitment
Since 2012, the« Water Lovers »and Waterlover: the first sun protection range oxybenzonate- and octinoxate-free (filters identified as toxic to coral reefs), which was launched after 9 years of research. Concrete formulatory commitment beyond marketing rhetoric.
Editorial reading
«Biotherm is interesting on three formulatory points: Pro-Retinol (a form of retinol documented with anti-ageing scores of 73-80) - the two Blue Therapy products are the most serious in the catalog analyzed. The Waterlover commitment (UV filters without oxybenzonate or octinoxate after 9 years of R&D) meets a real cosmetological requirement. And the Aquasource signal of an unfavorable reformulation illustrates why BeautyDecoded analyzes current INCI formulas, not memories of past products.»
Range mapping
The five Biotherm ranges, each with its own logic.
Organization by technological asset. Plankton de Vie is common to all ranges - the differentiating asset changes.
| range | Differentiating active ingredient + Plankton | Positioning |
|---|---|---|
| Blue Therapy / Pro-Retinol | Pro-Retinol + Biotech Plankton™ | Corrective anti-aging - scores 73-80 - universal profile |
| Life Plankton | 5 % Pure Life Plankton | Regeneration + hydration - oily/combination skin |
| Aquasource | Thermal plankton + hyaluronic acid | Hydration - historic range (reformulated) |
| Waterlover SPF | Clean UV filters + Plankton | Ecological sun protection - universal score 73-91 |
| Blue Peptides | Collagen peptides + Plankton | Firming and anti-aging - latest range |
Overview
The 6 products analyzed, at a glance.
Sorted by descending BeautyDecoded rating. Limited statistical base (1 to 2 reviews per product) - algorithmic scores remain reliable, user ratings are orientative.
| Product | Note | Opinions | Key score |
|---|---|---|---|
| Blue Pro-Retinol Eye Cream | 5,00/5 | 2 | Anti-ageing 79.9 (catalog record) |
| Waterlover Face Sunscreen SPF 50+ | 5,00/5 | 1 | Universal profile 91 - without harmful filters |
| Waterlove Hydrating Sun Milk SPF 50+ | 5,00/5 | 1 | Profile 73-91 - confirmed glow |
| Blue Therapy Pro-Retinol Cream | 4,25/5 | 2 | Anti-aging 74 - universal profile 80-91 |
| Life Plankton Elixir | 4,00/5 | 1 | Oily skin 91 - dry skin 17.5 |
| Aquasource Eye Contour Gel | 2,00/5 | 1 | Sensitive skin -8.75 - reformulation reported |
Note on BeautyDecoded reviews. The ratings and review excerpts displayed come from users of the BeautyDecoded application. These reviews are not verified. The volume of reviews per product is low (1 to 2 reviews) - interpret with caution. Algorithmic scores remain reliable.
Family 01
range Blue Therapy / Pro-Retinol - anti-aging
The strongest range in the Biotherm catalog analysed. Pro-Retinol is a modified form of retinol (esterified or encapsulated) that reduces immediate irritation while retaining its documented anti-aging effectiveness.
Pro-Retinol Eye Contour
TOP - Anti-aging 79.9 (record)
Blue Pro-Retinol Eye Cream
Eye contour with Pro-Retinol (stabilized retinol) + Biotech Plankton™. Anti-aging score 79.9 - the highest in the Biotherm catalog analysed. Dry skin score 84 and normal to dry skin score 91 - suitable for non-oily profiles. Sensitive skin score -3.0 - unsuitable, consistent with the presence of retinol in the periorbital area.
Scores BeautyDecoded
Dry skin
84
Oily skin
0
Normal to dry skin
91
Normal to oily skin
31,5
Sensitive skin
-3,0
Anti-aging
79,9
⛔ Sensitivity verdict
Not suitable for sensitive skin (score: -3.0). Consistent with the presence of retinol in the periorbital area. Gradual introduction mandatory for tolerant profiles. SPF 50+ mandatory in the morning (photosensitizing retinol).
«Blue Pro-Retinol Eye Cream is the product with the highest anti-ageing score in the Biotherm catalog in BeautyDecoded (79.9). Score 5/5 on 2 reviews confirming hydration and tolerance. Sensitive skin score -3.0: not suitable for hyper-reactive profiles - gradual introduction recommended. Pro-Retinol is formulatively differentiating: mechanism of action identical to native retinol (RAR/RXR receptors) with reduced initial irritation».»
Source : Kafi R et al. Improvement of naturally aged skin with vitamin A (retinol). Arch Dermatol. 2007.
User feedback
«Really smoothing eye contour - perfect galenic for a dehydrated eye contour, I'm 59. Pleasant sea spray scent. Convincing immediate effect.»
«Perfect eye contour hydration without irritation. On the fine lines side, I don't have enough experience but it seems to do the job.»
Verdict - TOP anti-aging product in the catalog. Anti-ageing 79.9 (record). Dry skin 84. Sensitive skin -3.0: caution. Oily skin 0: unsuitable. Rated 5/5 on 2 reviews.
Pro-Retinol day cream
TOP - Universal profile 80-91
Blue Therapy Pro-Retinol Moisturizing Cream
Daily moisturizing cream with Pro-Retinol + Biotech Plankton™. Virtually universal score 80-91 on all skin types. Anti-aging score 74 - the second highest in the catalog, consistent with the presence of retinol in a day cream. Sensitive skin score -4.0 - unsuitable, consistent with the presence of retinol and probably perfume.
Scores BeautyDecoded
Dry skin
80,5
Oily skin
84
Normal to dry skin
80,5
Normal to oily skin
91
Sensitive skin
-4,0
Anti-aging
74
⛔ Sensitivity verdict
Unsuitable for sensitive skin (score: -4.0). Initial adaptation of 2-4 weeks expected (light retinol purging). SPF 50+ mandatory in the morning.
«Blue Therapy Crème Hydratante Pro-Rétinol is Biotherm's best-formulated day cream in BeautyDecoded - anti-aging 74, near-universal profile 80-91, rating 4.25/5 on 2 reviews confirming initial adaptation then improvement. Sensitive skin -4.0: poorly adapted without gradual introduction. The 2-4 week adaptation phase followed by an improvement in skin texture is characteristic of a well-tolerated retinol formula.»
User feedback
«It's a relevant option - suits me well despite a difficult first few days of adaptation.»
«Perfect for combination skin - non-greasy texture that penetrates quickly. Clearer skin since I started using it. I recommend it.»
Verdict - TOP day cream. Anti-ageing 74. Near-universal profile 80-91. Sensitive skin -4.0. Initial adaptation (2-4 weeks). SPF 50+ mandatory.
Family 02
range Waterlover - Blue Beauty sun protection
First sun protection oxybenzonate- and octinoxate-free (toxic filters for coral reefs), launched after 9 years of research. Universal profile 73-91 on both references.
SPF 50+ face
TOP - Universal SPF
Waterlover Face Sunscreen SPF 50+
SPF 50+ face respectful of aquatic life. Oily skin score 91 and normal to dry/oily skin score 91 - almost universal profile. Dry skin score 73.5 - correct. Sensitive skin score -2.0 - slight caution due to chemical UV filters. Anti-ageing score 29.75 - relevant for an SPF with antioxidant actives.
Scores BeautyDecoded
Dry skin
73,5
Oily skin
91
Normal to dry skin
91
Normal to oily skin
91
Sensitive skin
-2,0
Anti-aging
29,8
⚠️ Sensitivity verdict
Slight caution recommended (score: -2.0). Linked to chemical UV filters. To be tested on highly reactive skin.
«Waterlover Face Sunscreen SPF 50+ is the best SPF in the Biotherm catalog in BeautyDecoded - almost universal profile 73-91, rating 5/5 out of 1 review covering the four key criteria (non-greasy finish, tolerance, no white film, does not sting the eyes). Oxybenzonate- and octinoxate-free formula (Blue Beauty commitment documented after 9 years of research). 1 opinion insufficient for definitive conclusion, but converging signals.»
User feedback
«Perfect - doesn't shine, doesn't give you pimples, doesn't leave white marks on the skin. And the icing on the Garonne cake: doesn't sting the eyes.»
Verdict - TOP SPF. Rated 5/5 (1 review). Near-universal profile 91. Sensitive skin -2.0. Non-oily finish, no white film, does not sting the eyes. No harmful reef filters.
SPF 50+ Sun Milk
Multi-purpose sun lotion
Waterlove Hydrating Sun Milk SPF 50+
SPF 50+ moisturizing sun lotion body and face. Normal to dry and normal to oily skin score 91 - almost universal. Dry skin score 73.5 - correct. Sensitive skin score -1.75 - slight caution, slightly less negative than Face Sunscreen (-2.0): formula slightly better tolerated.
Scores BeautyDecoded
Dry skin
73,5
Oily skin
84
Normal to dry skin
91
Normal to oily skin
91
Sensitive skin
-1,75
Anti-aging
25,5
⚠️ Sensitivity verdict
Slight caution recommended (score: -1.75). Slightly better tolerated than Face Sunscreen.
«Waterlove Hydrating Sun Milk SPF 50+ is a multi-purpose sun milk for body and face - almost universal profile (73-91), rated 5/5 out of 1 review confirming fluidity, invisibility and hydration. Sensitive skin -1.75: slight caution. More fluid texture than Face Sunscreen, designed for larger quantities. Blue Beauty formula without harmful filters. 1 review insufficient for definitive conclusion.»
User feedback
«Perfect for the city - fluid, quickly becomes invisible, moisturizing. Leaves a pretty glow to +/- powder.»
Verdict - Multi-purpose sun lotion. Rated 5/5 (1 review). Profile 73-91. Sensitive skin -1.75. Fluid, invisible, moderate glow. No harmful reef filters.
Family 03
range Life Plankton - signature asset
Pure Plankton of Life with 5 % - the brand's historic signature active ingredient. Light gel-water formula for non-dry skin.
Plankton of Life Elixir 5 %
Limited profile - oily skin
Life Plankton Elixir
Concentrated elixir Plankton of Life™ at 5 %. Oily skin score 84 and normal to oily skin score 91 - suitable profile. Dry skin score 17.5 - unsuitable, This is an important signal for a product positioned as «universal». Probably linked to a light, oil-free gel-water formula, sufficient for very dry skin.
Scores BeautyDecoded
Dry skin
17,5
Oily skin
84
Normal to dry skin
66,5
Normal to oily skin
91
Sensitive skin
-3,0
Anti-aging
48,5
⛔ Sensitivity verdict
Unsuitable for sensitive skin (score: -3.0). Dry skin score 17.5: surprising for a «universal elixir» - light formula better suited to non-dry profiles.
«Life Plankton Elixir is formulated around Biotherm's signature active ingredient - anti-aging 48.45, oily and combination skin profile (84-91). Dry skin 17.5: unsuitable - surprising for a «universal» product. Rated 4/5 on 1 positive review for hydration, but reporting repeated stock-outs. 30 years of research, 11 scientific publications and 8 active patents document this active ingredient according to L'Oréal - but independent clinical evidence remains limited.»
User feedback
«I love this serum, which moisturizes well and makes skin soft and comfortable. Too often out of stock, I stopped using it.»
Verdict - Active signature, limited profile. Rated 4/5 (1 review). Oily skin 91, dry skin 17.5. Anti-ageing 48.5. Sensitive skin -3.0. Out-of-stock items reported.
Family 04
range Aquasource - historical hydration
Biotherm's historic moisturizing range. The eye contour analyzed reveals an unfavorable reformulation signal reported by loyal users.
Eye contour gel
FLOP - Signalized reformulation
Aquasource Eye Contour Gel
Aquasource toning eye contour gel. Score for oily skin 84 and normal to oily skin 91. Dry skin score 0 - unsuitable, consistent with a lipid-free gel. Sensitive skin score -8.75 - the most negative score in the Biotherm catalog analysed. Value for concern for the naturally reactive periorbital area.
Scores BeautyDecoded
Dry skin
0
Oily skin
84
Normal to dry skin
49
Normal to oily skin
91
Sensitive skin
-8,75
Anti-aging
51
⛔ Sensitivity verdict
Not suitable for sensitive skin (score: -8.75). The most negative score in the Biotherm catalog. Suggests the presence of preservatives, alcohol or irritating active ingredients in high concentrations - or a complex fragrance.
Signal reformulation. The user review is clinically informative: a long-time loyalist who no longer finds the initial properties («it was fresh and moisturizing. It's no longer the case»). BeautyDecoded analyzes the INCI formula current, but not the historical formula - which explains the current very negative sensitivity score.
«Aquasource Eye Contour Gel disappoints - rated 2/5 out of 1 review documenting unfavorable reformulation (loss of freshness and hydration). Sensitive skin score -8.75: the most negative in the Biotherm catalog. Dry skin score 0: unsuitable. Imperfections 63.75: unexpected for this product. Blue Pro-Retinol Eye Cream (anti-aging 79.9) is the strongest alternative in the Biotherm catalog.»
User feedback
«It was good before - eye contour that I used for a very long time. The change in the formula means it no longer suits my skin. It used to be fresh and moisturizing. That's not the case anymore.»
Verdict - FLOP post-reformulation. Rating 2/5 (1 review). Sensitive skin -8.75 (lowest catalog). Dry skin 0. Reformulation reported. Prefer Blue Pro-Retinol Eye Cream.
Market positioning
Biotherm in the affordable pharmacy luxury.
Six French or benchmark marquess in the €15-80 segment. Biotherm is positioned between La Roche-Posay (daily dermatology) and Clarins (premium selective pharmacy).
| Brand | Average price | Positioning |
|---|---|---|
| Biotherm (L'Oréal) | 22-70 € | Thermal plankton + Pro-Retinol - Blue Beauty - affordable luxury |
| Clarins | 35-80 € | Actifs végétaux - Totale La Crème - premium pharmacie sélective |
| Filorga | 35-70 € | NCTF 135 HA - aesthetic medicine - clinically documented anti-aging |
| La Roche-Posay (L'Oréal) | 15-40 € | Thermal spring water - sensitive skin - dermatology - mass distribution |
| Caudalie | 20-50 € | Resveratrol + vine - Blue Beauty nature - spa Vinothérapie |
| SVR | 15-35 € | Displayed concentrations - documented corrective actives - fragrance-free |
BeautyDecoded summary
What the 8 reviews reveal about Biotherm.
Cross-catalog reading. Two solid ranges, one with a restricted profile, one reformulated reference to be avoided.
| Criteria | Signal BeautyDecoded | Conclusion |
|---|---|---|
| Pro-Retinol range | Anti-ageing 73-80, universal profile, rating 4.25-5/5 | Highlight: the highest anti-ageing scores in the database analysed |
| Waterlover range | Universal profile 73-91, rating 5/5, no harmful filters | Highlight: SPF is the best-rated and best-profiled product. |
| Sensitive skin | Scores -1.75 to -8.75 on all products | Unsuitable catalog for profiles hyper-reactive to fragrance |
| Life Plankton Elixir | Dry skin 17.5 - unsuitable despite «universal» positioning» | The elixir targets combination/oily skin, not dry skin. |
| Aquasource | 2/5 - loss of freshness after reformulation | Signal for vigilance: analyze the current formula, not the memory |
Frequently asked questions
Everything you need really know.
Is Biotherm a serious brand?
Biotherm is a French brand with a 70-year scientific history (Pyrenean thermal plankton, 30 years of biotechnology, 11 scientific publications, 8 patents). A positive sign: the Pro-Retinol formulas (anti-aging 73-80) are among the strongest in the luxury segment analyzed. The SPF Waterlover are unanimously rated 5/5. Negative signal: reformulated Aquasource (2/5) and generally negative sensitive skin scores (presence of fragrance).
Is the Blue Therapy Pro-Retinol range effective?
This is the strongest range in the Biotherm catalog analyzed in BeautyDecoded. The day cream boasts a anti-aging score of 74 (second in the catalog) and an almost universal profile (80-91). Eye contour gets 79,9 (first in the catalog). Reviews confirm: initial adaptation of a few days (expected for a retinol), then improved texture and clearer skin. SPF 50+ mandatory in the morning (photosensitizing retinol).
Are Biotherm Waterlover suncare products well formulated?
Yes - it's one of the highlights of the catalog. Waterlover Face Sunscreen SPF 50+ (profile 91 almost universal) and Waterlove Hydrating Sun Milk (73-91) both score 5/5. The formula oxybenzonate- and octinoxate-free is documented after 9 years of research. The sensitive skin score is slightly negative (-1.75 to -2.0) - linked to chemical UV filters - which is usual for this type of product.
Is Aquasource still as good as before?
According to the only BeautyDecoded review of Aquasource Eye Contour Gel, no - a reformulation is documented It used to be fresh and moisturizing, but that's no longer the case. BeautyDecoded analyzes the INCI formula current - the sensitive skin score -8.75 for the current eye contour product is the most negative in the Biotherm catalog. For Aquasource face gel, the data in the database is insufficient.
Biotherm Pro-Retinol vs. classic retinol: what's the difference?
Visit Pro-Retinol is a modified form of retinol (esterified or encapsulated) which reduces immediate irritation while retaining its anti-aging efficacy. The mechanism of action remains identical to that of native retinol: stimulation of collagen synthesis and acceleration of cell renewal via nuclear RAR/RXR receptors. Advantage: improved tolerability. Limitation: independent clinical evidence rarer than for native retinol at equivalent concentration.
Where can I buy Biotherm products in France?
Biotherm is distributed in luxury boutiques (Sephora, Galeries Lafayette, Le Bon Marché), online at biotherm.fr, and in selective parapharmacies. Prices are standardized - there are few promotions in selective distribution. Pro-Retinol formulas and SPF Waterlover are available in selected pharmacies. The biotherm.fr website offers samples for purchase - useful for testing before committing.
What is the BeautyDecoded application?
BeautyDecoded is an application that helps you choose cosmetics adapted to your skin type thanks to the’INCI analysis. The application analyzes formulations and generates compatibility scores for 80 skin types. It does not constitute a medical consultation.
Further information
Analyze a Biotherm product on your skin profile.
The BeautyDecoded application lets you scan any cosmetic product to visualize its suitability for your skin type and needs, based on INCI analysis.
Information for educational purposes only, not a substitute for medical consultation. BeautyDecoded is a cosmetic analysis application using artificial intelligence and is not a medical diagnostic tool. The results presented depend on the user's diligence and skin type. This article does not constitute a commercial partnership with the Biotherm brand.
