The INKEY List Caffeine Scalp Treatment 5.07 oz — Redensyl & Betaine overnight serum for denser, softer hair

The INKEY List Caffeine Stimulating Scalp Treatment is an overnight scalp serum that combines caffeine powder and Redensyl to support the appearance of denser, healthier-feeling hair.

This lightweight leave-on formula is designed to be applied nightly to the scalp. It targets the scalp environment with stimulating caffeine and a growth-supporting ingredient called Redensyl, while conditioning agents help maintain softness. The treatment is fragrance-free, cruelty-free, and formulated for all hair types, including color-treated hair. Regular nightly use across several months is recommended to see optimal cosmetic improvements in hair thickness and texture.

How should I use this treatment in my nightly routine?

Apply on clean, dry or damp scalp before bed. Shake the bottle to combine active ingredients, dispense into your palm, and massage gently into the entire scalp using fingertips. Leave the serum on overnight and wash hair as usual in the morning if you prefer.

• Shake before use to ensure even distribution.
• Use enough product to cover the scalp but avoid heavy buildup.
• Massage for 30–60 seconds to spread across the roots.
• Recommended nightly use for best cosmetic results over three months.

What key ingredients are in the formula and what do they do?

The formula pairs caffeine powder with Redensyl and betaine to support the scalp environment and leave hair feeling conditioned. Caffeine helps create a stimulating sensation at the scalp, Redensyl is included for its hair-supporting properties, and betaine provides hydration and softness.

• Caffeine powder: scalp stimulation and energizing sensation.
• Redensyl: ingredient aimed at supporting the hair growth cycle.
• Betaine: humectant that improves hair softness and manageability.
• Fragrance-free and cruelty-free formulation suitable for sensitive users.

Will this work on colored, textured, or thinning hair?

The treatment is formulated for broad compatibility, making it suitable for color-treated, chemically processed, or naturally textured hair. Its lightweight texture minimizes residue and should not weigh hair down when used sparingly. Users with visible thinning commonly include it in an evening regimen to support hair density appearance.

• Safe for colored and chemically treated hair.
• Appropriate for straight, wavy, curly, and coily textures.
• Non-perfumed formula reduces irritation risk for sensitive scalps.
• Designed as a topical cosmetic, not a medical treatment.

Who is this for: This product is aimed at anyone seeking a nightly, leave-on scalp serum to improve the look and feel of their hair—particularly people noticing reduced volume or wanting a fuller appearance. It's useful for those who prefer fragrance-free options, need a formula compatible with color-treated hair, or want an easy-to-use overnight step. If you have a specific scalp condition or are taking medication for hair loss, consult a healthcare professional before starting any new topical regimen.