The INKEY List Caffeine Scalp Treatment 5.07 fl oz — Overnight Serum with Redensyl for Thicker-Feeling, Softer Hair

The INKEY List Caffeine Stimulating Scalp Treatment is an overnight serum that combines caffeine powder and Redensyl to support the scalp and encourage thicker-feeling hair over regular nightly use.

This lightweight scalp treatment is formulated to be used as an overnight ritual: shake, apply to the scalp using your fingertips, leave on while you sleep, and rinse or wash out in the morning if desired. The formula pairs caffeine powder—known in cosmetic formulations for energizing the scalp environment—with Redensyl, a plant-derived active aimed at supporting the hair growth cycle, plus betaine to help condition strands so they feel softer. It comes in a 5.07 fl oz bottle, is fragrance-free and cruelty-free, and is suitable for all hair types including coloured hair.

How does this treatment fit into my nightly routine?

Use the treatment as a simple add-on to your evening routine. Shake the bottle, dispense into your palm, rub hands together, then use fingertips to massage evenly into the scalp and leave on overnight.

• Apply enough to cover the entire scalp for consistent coverage
• Massage gently to distribute the serum and activate circulation
• Leave in while sleeping; wash or rinse hair in the morning if preferred

What key ingredients should I expect and what do they do?

The formula highlights caffeine powder and Redensyl as the primary actives, with betaine as a conditioning support. These ingredients are combined to focus on scalp stimulation and hair feel rather than making therapeutic claims.

• Caffeine powder: added to stimulate and invigorate the scalp environment
• Redensyl: a plant-based ingredient used to support the hair growth cycle
• Betaine: helps condition hair so strands feel smoother and softer

How long until I notice changes and how often should I use it?

For best results, The INKEY List recommends nightly use and consistent application over time. Users commonly follow a three-month course for visible improvements in hair thickness and density, but individual timelines can vary.

• Use every night for continuous, cumulative effect
• Expect gradual changes over weeks; three months is the typical recommendation
• Suitable for ongoing maintenance after initial results are achieved

Is this treatment compatible with colored or sensitive hair?

The formula is designed to be colour-safe and gentle, being fragrance-free and cruelty-free. Because it’s lightweight and applied to the scalp, it integrates well into most haircare regimens, though a patch test is sensible for highly reactive skin.

• Safe for colour-treated hair with no added fragrance
• Sized for scalp application, not a heavy styling product
• Perform a patch test if you have very sensitive skin

Who is this for: This treatment is intended for anyone seeking a nightly scalp serum to help support the hair growth cycle and improve hair feel—suitable for all hair types, including coloured hair. It’s a convenient option for people who prefer an overnight routine, want a fragrance-free formula, and are looking for a product to use consistently over months rather than expecting immediate transformation.