K18

K18 Damage Shield pH Protective Shampoo.

Haircare

About this product

A gentle pH-balanced shampoo formulated to repair and strengthen damaged, dry hair using K18 peptides, provitamin B5, and hydrolyzed silk protein.

Full ingredients

Water (Aqua) (Eau), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl 2-Sulfolaurate, Sodium Lauryl Sulfoacetate, SH-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Disodium 2-Sulfolaurate, Caprylyl Glycol, Caprylhydroxamic Acid, Benzoic Acid, Citric Acid, Sodium Hydroxide, Sodium Chloride, Fragrance (Parfum), Limonene

Guru Score

83%

Yay

Early verdict · Few reviews so far

What they liked

Cleanses scalp without stripping moisture
Leaves hair soft and detangled
Gentle enough for damaged, brittle hair

What they flagged

Nothing. None of the experts who reviewed it raised a problem.

What the gurus are saying

This shampoo earns praise for leaving hair moisturized and untangled rather than dry and crunchy as it rinses through. The K18 peptide, provitamin B5, and hydrolyzed silk protein work together to repair and strengthen damaged hair, and reviewers find the scalp feels cleansed without stripping. Those with damaged, dry, or brittle hair may want to make this a regular part of their routine.

Synthesized from 2 expert reviews · most recent take December 2025

Best for

Dry skin

Type

HaircareLiquid

Key actives

Peptides

Formula notes

Contains fragranceNo drying alcohol

Where to buy

Sephora → Amazon → Google → iHerb →

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What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Yay takes Nay takes Mixed takes Hide sponsored

Caroline Hirons

250k subs

✓Yay

"K18 Damage Shield pH Protective Shampoo. I love. I've loved all of these."

Dr. Jenny Liu

323k subs

✓Yay

"The K18 Damage Shield pH Protective Shampoo is a really nice gentle shampoo that helps to go the extra mile to not only repair but also strengthen damaged hair. So if you have damaged hair and dry and brittle hair, this would be a really good shampoo to use on a regular basis. [...] Ingredient wise, it contains the K18 peptide that repairs your hair effectively along with provitamin B5 as well as hydrolyzed silk protein."

What the evidence says.

Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

Humectants and emollients

Ingredients like these draw water into the surface layers and slow how fast it leaves. The evidence is for comfort, softness and hydration rather than for changing the structure of the skin.

Source: DermNet

Peptides

Peptides are short protein fragments meant to signal repair. The evidence for them is thinner than for retinoids or vitamin C, and it varies a lot by the specific peptide, so the category is more promising than proven.

Source: NIH, National Library of Medicine

Frequently asked.

What is K18 Damage Shield pH Protective Shampoo?

A gentle pH-balanced shampoo formulated to repair and strengthen damaged, dry hair using K18 peptides, provitamin B5, and hydrolyzed silk protein.

Is K18 Damage Shield pH Protective Shampoo worth it?

Yes. All 2 gurus who reviewed it give it their stamp of approval, for a Guru Score of 83%.

What is K18 Damage Shield pH Protective Shampoo's Guru Score?

K18 Damage Shield pH Protective Shampoo holds a Guru Score of 83%. That is our read on how warmly the experts talk about it, based on the verdicts of 2 expert reviewers we have collected.