Olaplex
No5 Curl Hydrating Curl Conditioner250 ml
Sulfate-free
from€26.60
€10.64 / 100 ml
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No4 CurlHydrating Curl Shampoo
Hair product · no skin rating
- No drying alcohol
- Silicone-free
Buy from a trusted store
- LY
LykoCheapest
Updated 2026-09-12
Shop at LykoAffiliate link€38.00€26.60€10.64 / 100 ml
- CP
Cocopanda
Updated 2026-09-12
Shop at CocopandaAffiliate link€38.00
€15.20 / 100 ml
Prices come from Finnish online stores and are shown in euros. Cocopanda delivers only within mainland Finland; Lyko's delivery terms also list Sweden, Norway, Denmark, Poland, the Netherlands, Austria, and Germany. Neither delivers to the US or the UK.
Olaplex No4 CurlHydrating Curl Shampoo is a shampoo (250 ml). The ingredient list has 62 ingredients, including peptides, panthenol (B5), and hyaluronic acid. The product is silicone-free and sulfate-free. The product contains no drying alcohol. We compare prices at 2 retailers; the cheapest right now is €26.60.
- Product type
- Shampoo
- Size
- 250 ml
- Origin
- Western
Source: store product page · Updated 2026-09-12
Ingredient analysis
Contains 2 flagged ingredient groups. Key ingredient: AHA acids. This reading covers ingredient groups, not suitability for hair or scalp.
Flagged ingredient groups
- Fragrance5 ingredients
The product contains fragrance or declared fragrance allergens.
- Parfum (Fragrance)#50
- Benzyl Alcohol#56
- Citral#59
- Hexyl Cinnamal#61
- Limonene#62
- Essential oil1 ingredient
The product contains essential oils or plant extracts that naturally carry them.
- CitrusAurantium Peel Oil#60
Key ingredients
Water-soluble acids that work on the skin surface.
A humectant that binds water.
A humectant often used in formulations for sensitive skin.
Short amino-acid chains used in conditioning formulations.
Polyhydroxy acids. The molecule is larger than the AHAs', they penetrate more slowly and also work as humectants; an acid routine is often started with these.
This is a hair product. We read the same ingredient groups as on a skincare product — fragrance, sulfates, silicones and drying alcohols — but we publish no acne-prone rating and no judgment about whose hair or scalp it suits. An ingredient list cannot tell you that.
Confidence: medium · v2026.09.3
This assessment is read from the ingredient list and is not medical advice. It makes no promise about acne. Individual skin reactions vary.
Read how we classify productsDryingness index
0/ 100Practically non-drying
The most drying ingredients
- Sodium C14-16 Olefin Sulfonate(position 4)
- Sodium Chloride(position 53)
- Lactic Acid(position 36)
Ingredients that lower the score
- Sodium Cocoyl Isethionate(position 2)
- Cocamidopropyl Betaine(position 3)
- Decyl Glucoside(position 6)
- Panthenol(position 10)
- Polyquaternium-7(position 12)
- Glycerin(position 27)
- Propylene Glycol(position 44)
Why this number
Dryingness 0/100 — practically non-drying. The reading comes from the ingredient list and its order, not from a measurement. The largest additions: Sodium C14-16 Olefin Sulfonate (position 4), Sodium Chloride (position 53), Lactic Acid (position 36). Pulling the score down: Sodium Cocoyl Isethionate (position 2), Cocamidopropyl Betaine (position 3), Decyl Glucoside (position 6).
Computed from the ingredient list · v2026.08.1
The number is computed from the declared ingredient list and its order. A label does not state concentrations, so this is a reading of the formula — not a prediction of how the product feels in use.
How the dryingness index is calculatedFull ingredient list
- 1
- 2
- 3
- 4Sodium C14-16 Olefin Sulfonate
- 5
- 6
- 7
- 8
- 9Carthamus Tinctorius (Safflower) Oleosomes
- 10
- 11
- 12
- 13
- 14
- 15
- 16Linum Usitatissimum (Linseed) SeedExtract
- 17
- 18
- 19
- 20
- 21
- 22JojobaEsters
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34CaprylicAcid
- 35
- 36
- 37Hydroxypropyl Bis-Hydroxyethyldimonium Chloride
- 38GuarHydroxypropyltrimonium Chloride
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46Pentaerythrityl Tetra-Di-t-ButylHydroxyhydrocinnamate
- 47
- 48Sodium Metabisulfite
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
The order is the manufacturer's own and follows concentration down to the one percent mark. Underlined names are flagged by our criteria. Names with a dotted underline open a short note on what the ingredient does in the formula.
