Just for Men Shampoo-In Color — Medium-Dark Brown H-40, 5-Minute Ammonia-Free Gray Coverage with Keratin

Just For Men Shampoo-In Color H-40 (Medium-Dark Brown) is a five-minute, ammonia-free shampoo-in hair color that targets gray hairs for a natural, longer-lasting result while conditioning with keratin, olive oil, and vitamin E.

This formula—formerly called the Original Formula—was developed to blend gray hairs with your natural shade rather than recoloring every strand. The shampoo-in application is built for speed and simplicity: mix, apply, wait five minutes, rinse. It’s designed to preserve subtle natural color variation while supporting hair strength and appearance with added conditioning ingredients.

How does this product restore color so quickly?

The Shampoo-In Color uses a targeted gray-coverage system that deposits pigment only where grays are present, so results appear natural and consistent with your original shade. The whole process is fast: mix the color base into the applicator bottle, shake, apply, leave for five minutes, then rinse. Because the pigment bonds where gray hair is, coverage looks subtle and integrated instead of uniformly dyed.

• Five-minute processing time for quick results
• Targeted gray coverage to retain natural color variation
• Simple mixing and applicator bottle for easy use

Will this damage my hair or change texture?

This formula is ammonia-free and includes keratin, olive oil, and vitamin E to help support stronger-looking, fuller hair rather than strip it. While temporary changes in texture can occur with any hair coloring product, this version is formulated to minimize harsh chemical impact and leave hair feeling conditioned. Follow the included instructions and use the provided gloves to protect skin from staining.

• Ammonia-free formula to reduce harsh chemical exposure
• Keratin helps support hair strength and a smoother appearance
• Olive oil and vitamin E add conditioning benefits

How long will the color last and how often should I reapply?

Color from Shampoo-In Color does not wash out and lasts until new gray hair grows in. Most users find touch-ups are needed as grays regrow—typically every several weeks depending on hair growth rate. A single box offers up to three applications for spot coverage or multiple touch-ups, so plan product use based on the amount of gray you’re covering.

• Permanent coverage that lasts until gray hair regrows
• Up to three applications per box for touch-ups or larger coverage
• Reapply when new gray hair becomes visible

Which shade should I choose and how do I pick between two shades?

Just For Men offers 15 shades from sandy blond to jet black; Medium-Dark Brown (H-40) is a balanced darker brown suitable for many natural tones. If you’re unsure between two shades, start with the lighter option—you can always move darker later for a closer match. The targeted formula helps blend rather than produce an all-over solid color, making shade selection more forgiving.

• 15 shade options to match natural tones
• Choose lighter shade first when undecided
• Targeted blending maintains natural highlights and lowlights

Who is this for? Just For Men Shampoo-In Color H-40 is made for men who want a fast, low-effort solution to cover gray hairs while keeping a natural look and maintaining hair condition. It’s ideal for men who prefer a quick at-home regimen, those doing periodic touch-ups, or anyone who wants permanent gray coverage without the harshness of ammonia-based dyes. Always perform the enclosed 48-hour skin allergy test before use and follow package directions for best results.

Ingredients

Water, Toluene-2,5-Diamine, m-Aminophenol, Ethanolamine, Keratin, Hydrolyzed Keratin, Olea Europaea (Olive) Fruit Oil, Tocopheryl Acetate, Cetearyl Alcohol, Resorcinol, Carbomer, Sodium Sulfite, Coco-Glucoside, Erythorbic Acid, N,N-Bis(2-Hydroxyethyl)-p-Phenylenediamine Sulfate, p-Aminophenol, Cetearyl Glucoside, Ceteth-10 Phosphate, Dicetyl Phosphate, Etidronic Acid, Fragrance. Color Developer: Water, Hydrogen Peroxide, Cetearyl Alcohol, Laureth-23, Ceteareth-20, Acrylates/Steareth-20 Itaconate Copolymer, Steareth-2, Etidronic Acid, Disodium EDTA, Sodium Stannate.