Comparison between Olaplex No. 3 Hair Perfector vs. K18 Leave-in Molecular Repair Hair Mask

Find out which product is better for your skin.

27 Ingredients 21

1
Water
1
Water (Aqua) (Eau)
2
Bis-Aminopropyl Diglycol Dimaleate
2
Alcohol Denatured
3
Propylene Glycol
3
Propylene Glycol
4
Cetearyl Alcohol
4
Cetearyl Alcohol
5
Behentrimonium Methosulfate
5
Dicaprylyl Ether
6
Cetyl Alcohol
6
Cetyl Esters
7
Phenoxyethanol
7
Behentrimonium Chloride
8
Glycerin
8
Polysorbate-20
-- Show others --
Uniqueness21 out of 27
77.8%
Uniqueness15 out of 21
71.4%

Positive Effects

Find out what good effects the product has

ECO Metrics

Find out how eco-friendly the components are
Vegan
No
No
Cruelty free
No
No
Reef friendly
Yes
Yes
Ozone layer safe
Yes
Yes
Organic score
natural
7 out of 27
26%
chemical
19 out of 27
70%
natural
7 out of 21
33%
chemical
12 out of 21
57%

Concerns

Pay attention to these components
-- Extra information --

Components by Skin Type

Find out what components are good or bad for your skin type
Dry skin
Positive: 5Negative: 0
Propylene Glycol#3Glycerin#8Ascorbic Acid (Vitamin C)#20Panthenol#24Simmondsia Chinensis (Jojoba) Seed Oil#25
Oily skin
Positive: 0Negative: 0
Sensitive skin
Positive: 0Negative: 1
Citric Acid#26
Dry skin
Positive: 2Negative: 1
Propylene Glycol#3Tocopherol#13Alcohol Denatured#2
Oily skin
Positive: 0Negative: 0
Sensitive skin
Positive: 0Negative: 4
Isopropyl Alcohol#12Citric Acid#16Linalool#19Hexyl Cinnamal#20

Detailed view

Olaplex No. 3 Hair Perfector vs. K18 Leave-in Molecular Repair Hair Mask
Position 1

#1Water

Origin: natural
Role: Solvent
EWG Rating [ 1 ]

Water is a great solvent. It’s neutral and doesn’t provide any strong positive or negative effects. It just helps components to mix better and to transport active components.

-- versus --

#1Water (Aqua) (Eau)

Origin: No information
Role: No information
Position 2

#2Bis-Aminopropyl Diglycol Dimaleate

Origin: No information
Role: No information
EWG Rating [ 1 ]
-- versus --

#2Alcohol Denatured

Origin: chemical
Role: Antifoaming agent, Antimicrobial agent, Astringent, Masking, Solvent, Viscosity controlling agent
Antiseptic
Alcohols
EWG Rating [ 1 ]
Bad for dry skin
Bad for dry skin

Alcohol Denatured is a great bacteria killer. Manufacturers often put it inside products to increase their shelf life.

It’s one of the most harmful alcohols used in skincare. You should use it carefully, especially if you have dry skin. It removes oily barrier from the surface of your skin making it less protected and causing dryness. We advise you to pay attention to the position of this component in a formulation. If it stays below the 6th position it will hardly harm your skin. We also recommend testing the product first before application. If you feel a “cooling effect” it means the product contains a lot of alcohol and it's better to be careful with it.

Position 3
Both products have the same component on this position.

#3Propylene Glycol

Origin: chemical
Role: Skin conditioning agent, Fragrance ingredient, Humectant, Solvent, Viscosity controlling agent
Moisturizing
EWG Rating [ 3 ]
CIR Rating [ B ]
Good for dry skin
Good for dry skin

Propylene Glycol is a useful componet with many positive effects. It’s a very good moisturizer. It helps to deliver ingredients into deeper layers of the skin. It creates a protective layer on the skin preventing water loss. The component is researched very well and doesn’t have notable side effects. It’s used even for making food.

Position 4
Both products have the same component on this position.

#4Cetearyl Alcohol

Origin: chemical
Role: Emollient, Emulsifying agent, Emulsion stabilizer, Foam booster, Surfactant, Viscosity controlling agent
Comedogenic rating [ 2 ]
EWG Rating [ 1 ]
CIR Rating [ A ]

Cetearyl Alcohol is used mostly for formulation purposes. It’s a very good emulsifier and emulsion stabilizer. It helps the ingredients mix better and it makes the product spread on your skin evenly. It also makes the product thicker. It doesn’t belong to harmful alcohols and it will not dry your skin.

Position 5

#5Behentrimonium Methosulfate

Origin: natural
Role: Antistatic agent, Hair conditioning, Surfactant
Hair structure improvement
Hair volumizing
Hair gloss
Hair protection
EWG Rating [ 4 ]
CIR Rating [ B ]
-- versus --

#5Dicaprylyl Ether

Origin: chemical
Role: Skin conditioning agent, Emollient, Solvent
EWG Rating [ 1 ]
Skin Signal
2023 - 2024

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