Cash In Repair Serum

Significantly reduce breakage and repair damage at the source with this high-powered restorative serum. Boosted with clean, clinically-proven Vegan Silk and Biomimetic Bond-Building Technology to reduce breakage and increase strength from the inside out. A highly-concentrated, silicone-free serum that provides 11x softer* strands, with 88% split end sealing and 450°F degree heat protection.
Subscription details
How subscriptions work
Products are automatically delivered on your schedule. No obligation, modify or cancel your subscription anytime.
Learn more...
In stock

What it is
This clinically-proven treatment serum significantly repairs damage and reduces breakage.* Concentrated, lightweight formula features biomimetic bond-building technology to instantly moisturize, mend split ends, provide softness and shine, and protect from heat damage.
Key Benefits
  • Color Care Color Safe
    Color Care Color Safe
  • Heat Protectant
    Heat Protectant
  • Lightweight Weightless
    Lightweight Weightless
  • Safe For Chemically Treated Hair
    Safe For Chemically Treated Hair
  • Shine
    Shine
Who it's best for
  • Straight
  • Wavy
  • Curly
  • Coily
How to use
Apply generously to hair. Follow with styler.
Key Ingredients
  • Vegan Silk Extract
    Vegan Silk Extract

    vegan protein derived from fermentation biotechnology that supports hair strength by forming a physical yet breathable layer of protection and support (Ingredient sourced from biotechnologically derived silk proteins.)

  • Biomimetic Bond Building Technology
    Biomimetic Bond Building Technology

    naturally-derived peptide (aka a protein building block) that repairs and reseals damaged hair, restoring the look and feel of shiny, smooth, healthy tresses.

  • Baobab Oil
    Baobab Oil

    extracted from the “Tree of Life,” this oil restores moisture, strength, and reflective shine.

  • Amla Oil
    Amla Oil

    naturally derived from Indian gooseberry for deep moisture and to help seal the cuticle.

- Instantly repairs and protects against breakage*
- Boosted with Biomimetic Bond-Building Technology
- Significantly repairs damage from mechanical, chemical, and heat damage
- Hair feels 11x softer*
- Seals 88% of split-ends and protect from 450°F heat**
*When used as a system of Pay Day Instant Repair Shampoo, Conditioner and Cash In Instant Repair Serum vs control

  • Water (Aqua/Eau)
  • Propanediol
  • Hydroxyethylcellulose
  • Dicaprylyl Ether
  • Adansonia Digitata Seed Oil
  • sr-Spider Polypeptide-1
  • Orbignya Oleifera Seed Oil
  • Salvia Hispanica Seed Extract
  • Brassica Campestris (Rapeseed) Seed Oil
  • Emblica Officinalis Fruit Extract
  • Sesamum Indicum (Sesame) Seed Oil
  • Cetearamidoethyldiethonium Succinoyl Hydrolyzed Pea Protein
  • Opuntia Ficus-Indica Fruit Extract
  • Sodium Formate
  • Saccharomyces Cerevisiae Extract
  • Phenoxyethanol
  • Decyl Glucoside
  • Heptyl Glucoside
  • Glyceryl Oleate
  • Polyquaternium-73
  • Cetrimonium Chloride
  • Panthenol
  • Ethylhexylglycerin
  • Glycerin
  • Citric Acid
  • Benzoic Acid
  • Tetrasodium Glutamate Diacetate
  • Leuconostoc/Radish Root Ferment Filtrate
  • Sodium Benzoate
  • Heptanol
  • Tocopherol
  • Sodium Hydroxide
  • Sodium Glycolate
  • Potassium Sorbate
  • 1,2-Hexanediol
  • Fragrance (Parfum)
  • Caprylyl Glycol
Videos
average rating 4.3 out of 5
Based on 21 reviews
  • 5 Stars
    16 Reviews
  • 4 Stars
    1 Review
  • 3 Stars
    1 Review
  • 2 Stars
    1 Review
  • 1 Star
    2 Reviews
81% of reviewers would recommend this product to a friend
Results
Rated 4 out of 5
21 Reviews
Reviewed by Madelaine G.
Verified Buyer
I recommend this product
Age Range
35 - 44
Hair Description
  • Damaged
  • Wavy
  • Chemically-Treated
  • Color-Treated
Product Standouts
  • Softens Hair
  • Good For Dry Hair
  • Smells Great
Rated 5 out of 5
Review posted

Me encanta

Lo amo, se absorbe tan rápido y deja el cabello con una textura deliciosa, suave, hidratado y huele tan bien que lo he usado después del planchado.

Loading...
Results
Rated 4 out of 5
Was this helpful?

IGK Hair

¡Gracias por tus comentarios, Madelaine!

Reviewed by Michele G.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Color-Treated
  • Thin
  • Wavy
Product Standouts
  • Adds Shine
  • Smooths
  • Reduces Frizz
Rated 5 out of 5
Review posted

Amazing

This product is super lightweight and really makes your hair smooth shiny. Great heat protection too. Highly recommend!

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thanks so much for sharing your feedback, Michele!

Reviewed by Robin H.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Color-Treated
Product Standouts
  • Softens Hair
  • Strengthens
  • Smells Great
  • Reduces Frizz
Rated 5 out of 5
Review posted

Serum

Makes my hair less frizzy and has helped with split ends

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thank you for your feedback, Robin!

Reviewed by Tara N.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Curly
  • Chemically-Treated
  • Color-Treated
  • Damaged
  • Dry
Product Standouts
  • Smooths
  • Reduces Frizz
  • Adds Shine
  • Softens Hair
  • Good For Dry Hair
Rated 5 out of 5
Review posted

Really works

Searched many years for something that really works, this really does!!! Love it.

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thanks so much for your feedback, Tara!

Reviewed by Lorane R.
Verified Buyer
I recommend this product
Age Range
35 - 44
Hair Description
  • Wavy
Product Standouts
  • Adds Shine
  • Softens Hair
  • Reduces Frizz
Rated 5 out of 5
Review posted

Love it!

Love the way it makes my hair feel and smell!

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Hi Lorane! Thank you for sharing your feedback!

Reviewed by Marcella R.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Curly
Product Standouts
  • Conditions Well
  • Adds Shine
  • Detangles
  • Softens Hair
  • Curl Friendly
Rated 5 out of 5
Review posted

Cash in for curly, coarse hair

This product is amazing! I only use IGK products! They are the best I've ever used and my hairdresser is amazed how healthy my hair is!

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thank you for taking the time to leave a review, Marcella!

Reviewed by Megan
Verified Reviewer
I recommend this product
Age Range
25 - 34
Hair Description
  • Wavy
  • Color-Treated
  • Damaged
Product Standouts
  • Reduces Frizz
  • Smooths
  • Strengthens
  • Softens Hair
Rated 5 out of 5
Review posted

It Works!

Lightweight formula that does exactly what it says it does - hair is softer, less frizzy and hides my split ends. This serum works so much better for my fine hair than Olaplex. This is the first IGK product I used and I had such great results, I tried the dry shampoos and dry hair mask also. I love them all!

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thanks so much for taking the time to share your feedback, Megan!

Reviewed by Laurie M.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Thin
  • Color-Treated
  • Chemically-Treated
Rated 5 out of 5
Review posted

Hair looks and feels great

Nice alternative to olaplex

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Thank you for your feedback, Laurie!

Reviewed by Jennifer S.
Verified Buyer
I recommend this product
Age Range
35 - 44
Hair Description
  • Thin
  • Damaged
  • Wavy
  • Color-Treated
  • Dry
Product Standouts
  • Conditions Well
  • Softens Hair
  • Good For Dry Hair
  • Smooths
  • Reduces Frizz
Rated 5 out of 5
Review posted

Awesome

Makes my hair smooth and frizz free!

Loading...
Results
Rated 5 out of 5
Was this helpful?

IGK Hair

Hi Jennifer! Thanks for taking the time to leave a review for Cash In!

Reviewed by Randi S.
Verified Buyer
I recommend this product
Age Range
55 - 64
Hair Description
  • Wavy
  • Color-Treated
  • Thick
Product Standouts
  • Adds Shine
  • Reduces Frizz
  • Smooths
Rated 5 out of 5
Review posted

Great product

Used couple times and makes a difference

Loading...
Results
Rated 4 out of 5
Was this helpful?

IGK Hair

Thanks for taking the time to share your feedback, Randi!

CRUELTY FREE
No animals were harmed. Ever.
Gluten-Free
No traces of wheat anywhere.
Vegan
No harsh, harmful chemicals.
CRUELTY FREE. GLUTEN-FREE. VEGAN