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Hair Growth & Volume Duo products on green background
Hair Growth & Volume Duo Caffeine Scalp Treatment bottle infographic: Amount to apply, when to apply and how often
Hair Growth & Volume Duo Peptide Volumizing Hair Treatment bottle infographic: Amount to apply, when to apply and how often
Texture text overlay 'helps reduce hair loss, encourages hair growth through scalp stimulation and proven to increase hair thickness and volume'
Hair Growth & Volume Duo model with Caffeine Scalp Treatment bottle

Hair Growth & Volume Duo

Reduce hair loss and boost volume in 2 easy steps

4.2
Rated 4.2 out of 5 stars
4.2 Stars (31 Reviews)
$24.00 $32.00 / 2 full-size products

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We lose on average 50-100 hairs from our head on a daily basis. As new hair grows through the follicle, old hair eventually falls out as part of the ‘exogen’ phase of hair growth. However, when this process is imbalanced, with less hair growing than falling out, it can make the hair feel thin, flat and lacklustre.

Each Hair Growth & Volume Duo contains a full size;

Caffeine Stimulating Scalp Treatment (150ml) : An overnight scalp treatment that uses caffeine powder and an ingredient called Redensyl™ to help reduce hair loss by stimulating the scalp and hair follicles, therefore encouraging hair growth and helping to improve hair thickness.

Peptide Volumizing Hair Treatment (100ml) : When hair sheds it can feel thin and lacklustre. Using Peptides, the chains of amino acids that support proteins naturally found in hair, our unique lightweight formula increases hair thickness and volume.

Suitable for:

  • All Hair Types
  • Colored Hair
  • Pregnancy & Breastfeeding

Targets:

  • Thinning Hair
  • Fine, Limp or Flat-looking Hair

Proud to be:

  • Carbon Net-Zero
  • Vegan
  • Alcohol Free
  • Silicon Free
  • Sulphate Free
  • Cruelty Free
  • B-Corp
  • Recyclable
  • theinkeylist.com exclusive

Shipping info

Standard tracked shipping

  • $5.95 or FREE on orders over $35
  • (2-5 business days*)

Express tracked shipping

  • $15
  • (2-3 business days*, when ordered before 3pm EST)

*Find out more about shipping here.

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4.2
Rated 4.2 out of 5 stars
Based on 31 reviews
Total 5 star reviews: 17 Total 4 star reviews: 7 Total 3 star reviews: 3 Total 2 star reviews: 3 Total 1 star reviews: 1
Reviews Summary
Customers say this hair treatment duo provides mixed results, with the volumizing serum receiving more consistent praise than the caffeine treatment. Many users notice immediate volume improvements and thicker-feeling hair with the peptide serum. The caffeine treatment shows varied outcomes - some report new hair growth and reduced shedding within weeks, while others see no difference after months of use. Common concerns include scalp irritation, greasiness requiring next-day washing, and contact dermatitis from the caffeine formula. Users appreciate the easy application and pleasant scent, though some find the caffeine treatment leaves hair messy. Several customers prefer using the volumizing serum alone.
31 reviews
  • C W.
    Verified Buyer
    I do not recommend this product
    Age Range 25 - 34
    Hair Goals Hydration, Anti-Frizz, Hair Growth, Curl Definition, Oil Control
    Rated 2 out of 5 stars
    1 week ago
    No effect unfortunately

    After using both of these for a few months unfortunately i didn't notice a difference with either. I have short pieces around my hairline i would love to grow as it makes ponytail look bad however no success. They both applied easy and smell fine etc, just didn't work for me whatsoever sadly.

  • Frannie R.
    Verified Buyer
    I recommend this product
    Age Range 25 - 34
    Hair Type Straight
    Hair Goals Hair Growth
    Skin Type Dry
    Sensitive Skin Friendly? Yes
    Rated 5 out of 5 stars
    1 month ago
    Hair growth after Brain Surgery

    I needed to shave my head for brain surgery, and knew there would be eventual scars. I was excited to see the results happening over the scars and growing back hair in places that surprised even my surgeon!

  • MM
    Age Range 25 - 34
    Hair Type Curly
    Hair Goals Hair Growth
    Rated 3 out of 5 stars
    1 month ago
    Caffeine treatment works for me

    They used to sell just the caffeine treatment. I don’t care for the peptide product. Please allow customers to continue purchasing the caffeine product separately. I’ve done the full PRP treatment and used fancy scalp serums … all a waste of money. This caffeine treatment is the only product where I’ve quickly noticed hair shedding (from the root) slow down.