Biotherm Blue Therapy Mulit-Defender Spf 25
71/100 overall score
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About this sunscreen
Biotherm Blue Therapy Multi-Defender is a chemical SPF 25 moisturizer with sun protection, using a hybrid filter set of Octocrylene, Ethylhexyl Salicylate, Avobenzone and Drometrizole Trisiloxane. It has a balanced finish, feels lightweight and keeps white cast low, with a low pore-clogging profile, though it can sting if it reaches the eyes and works only okay under makeup. With good protection and a score of 70.9/100, it is a reasonable daily option, but SPF 25 is on the lower side for extended sun.
Ingredient & SPF scores
☀️
UV protection
Good
71
- +16 Octocrylene at #3, UV filter
- +7.6 Ethylhexyl Salicylate at #5, UV filter
- +24 Butyl Methoxydibenzoylmethane at #8, UV filter (UVA1 +12.8)
- +24 Drometrizole Trisiloxane at #15, UV filter (UVA1 +8.4)
- −0.6 UVA2 coverage saturated
☢️
Health safety
High
67
- +100 Starting score
- −30 Octocrylene at #3 (regulatory/evidence concern)
- −3.5 Avobenzone at #8, stacked (regulatory/evidence concern)
🤧
Allergens
Low
67
- +100 Starting score
- −18 Fragrance
- −12 6 declared fragrance allergens
- −3 Photoallergen-tail UV filters (Octocrylene)
👻
White cast
Low
99
- +100 Starting score
- −2 Titanium Dioxide as pigment (CI 77891) at #25
- +1 Iron-oxide undertone, partial masking
🔥
Eye sting
Medium
44
- +100 Starting score
- −8 Avobenzone at #8, migrates into eyes with sweat
- −22 Octocrylene at #3, migrates into eyes with sweat
- −6 Octisalate at #5, migrates into eyes with sweat
- −4 Volatile alcohol at #9
- −8 Fragrance
- −8 5 declared fragrance allergens
🪨
Heavy feel
Low
96
- +100 Starting score
- −2 Tribehenin at #21, wax film
- −2 Paraffin at #17, wax film
🍄
Fungal acne
Medium
50
- +100 Starting score
- −50 6 long-chain (C12+) esters that feed Malassezia (Glyceryl Stearate, Glyceryl Dibehenate, PEG-100 Stearate)
👕
Fabric stains
High
0
- +100 Starting score
- −38 Avobenzone at #8, reacts with iron in wash water into rust-yellow stains
- −15 Octocrylene at #3, co-stains alongside avobenzone
- −10 Mexoryl XL at #15, oil-soluble UVA filter, fabric stains
- −10 Avobenzone + Octocrylene, the classic staining pair
- −40 Iron-oxide pigments at #49, makeup-like collar marks (washable)
- +13 Penalties exceed the scale, floored at 0
💧
Moisture
Hydrating
LightNourishing
- ← 5 Volatile alcohol at #9
- ← 3 Volatile carriers flash off, leaving a dry finish
- → 16 Glycerin at #2, the anchor humectant
- → 1 1 strong humectants (Saccharide Isomerate)
- → 1 Humectant polyols
✨
Finish
Balanced
MatteDewy
- ← 3 Volatile carriers flash off, leaving a dry finish
- ← 1 Volatile alcohol at #9
💄
Makeup base
Okay
PillsPrimer
- → 5 Primer-style base, volatile silicones and dimethicone slip
- → 2 Quick-setting carrier (alcohol at #9), fast, even canvas
- ← 1 Gel polymers prone to pilling under friction (Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Polyacrylamide)
- ← 3.5 Humectant syrup tackiness (partly offset by the base)
🌊
Water resistance
Not resistant
Non-water-resistantWater-resistant
- +4 2 water-locking waxes
Skincare extras
Beneficial actives this formula contains. Informational only, not part of the rating: their effect depends on a concentration the label does not disclose.
- ✨ Niacinamide
Full ingredient list (57)
What each ingredient does and how it moves each rating: green helps, red hurts, ↑ / ↓ give the direction, and ← / → shift a slider toward its ends (finish, moisture, makeup base). Auto-derived from our scoring rules and the ingredient's position.
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1 Water
Solvent base, the water phase
-
2 Glycerin
Humectant, pulls water into the skin
- 16 → nourishing the anchor humectant
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Legacy UV filter (Octocrylene), high in the list, a primary filter
- ↑ 16 UV protection
- ↑ 22 migrates into eyes with sweat
- ↑ 15 co-stains alongside avobenzone
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Soothing, skin-conditioning active
-
Legacy UV filter (Octisalate)
- ↑ 7.6 UV protection
- ↑ 6 migrates into eyes with sweat
-
Humectant, pulls water into the skin
- 1 → nourishing humectant polyol
-
Emollient, softens and smooths skin
-
Legacy UV filter (Avobenzone), low in the list, likely a minor contributor
- ↑ 24 UV protection, incl. long-UVA (UVA1)
- ↓ 3.5 stacked (regulatory/evidence concern)
- ↑ 8 migrates into eyes with sweat
- ↑ 38 reacts with iron in wash water into rust-yellow stains
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Volatile alcohol, a drying solvent that can sting eyes
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Volatile silicone, flashes off for a light finish
- light ← 2 volatile carrier, flashes off
- matte ← 2 volatile carrier, flashes off
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Plant oil, an emollient
-
Antioxidant, protects the formula and skin
-
Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
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Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
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Modern UV filter, broad-spectrum and photostable (Mexoryl XL), low in the list, likely a minor contributor
- ↑ 24 UV protection, incl. long-UVA (UVA1)
- ↑ 10 oil-soluble UVA filter, fabric stains
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Fatty alcohol, an emollient and thickener, not the drying kind
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17 Paraffin
Occlusive, seals moisture into the skin
- ↑ 2 wax film
- ↑ 2 wax water lock
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Fatty alcohol, an emollient and thickener, not the drying kind
-
Fatty alcohol, an emollient and thickener, not the drying kind
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20 Tocopherol
Antioxidant, protects the formula and skin
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21 Tribehenin
Emollient, softens and smooths skin
- ↑ 2 wax film
- ↑ 2 wax water lock
-
Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
-
Preservative, keeps the formula from spoiling
-
Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
-
Colorant or pigment
-
Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
-
Emulsifier, keeps oil and water blended
-
Thickener and texture, structures the gel or cream
-
Emollient, softens and smooths skin
-
Supporting ingredient
-
Preservative, keeps the formula from spoiling
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32 Xanthan Gum
Thickener and texture, structures the gel or cream
-
Emollient, softens and smooths skin
- light ← 1 volatile carrier, flashes off
- matte ← 1 volatile carrier, flashes off
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Botanical extract
-
Thickener and texture, structures the gel or cream
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Chelator, binds stray metal ions to keep the formula stable
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Emollient, softens and smooths skin
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38 Laureth-7
Emulsifier, keeps oil and water blended
- ↑ 9 feeds malassezia
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pH adjuster
-
Botanical extract
-
Supporting ingredient
-
42 Limonene
Fragrance component, a declared allergen
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43 Adenosine
Soothing, skin-conditioning active
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pH adjuster
-
45 Linalool
Fragrance component, a declared allergen
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46 Geraniol
Fragrance component, a declared allergen
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47 Citronellol
Fragrance component, a declared allergen
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Humectant, pulls water into the skin
-
49 Ci 77491
Colorant or pigment
- ↑ 40 makeup-like collar marks (washable)
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Preservative, keeps the formula from spoiling
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Botanical extract
-
Humectant, pulls water into the skin
- 1 → nourishing humectant
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53 Citral
Fragrance component, a declared allergen
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Thickener and texture, structures the gel or cream
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55 BHT
Antioxidant, protects the formula and skin
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56 Sea Salt
Thickener and texture, structures the gel or cream
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57 Fragrance
Fragrance
Is Biotherm Blue Therapy Multi-Defender mineral or chemical?
It is chemical, using a hybrid set of Octocrylene, Ethylhexyl Salicylate, Avobenzone and Drometrizole Trisiloxane. There are no mineral filters.
What SPF is the Biotherm Blue Therapy Mulit-Defender Spf 25?
It is SPF 25, which is on the lower side. It suits daily wear more than long sessions of direct sun exposure.
Does it work for oily skin?
The finish is balanced and pore-clogging is low, so it is generally workable, though it can sting if it reaches the eyes and works only okay under makeup.