Kao THE ANSWER Guide: Which Shampoo and Treatments to Buy

The Complete Kao THE ANSWER Guide: Every Product Explained

In This Guide

If you have been anywhere near Japanese hair care content in the last year, you have probably seen THE ANSWER. The packaging is minimal, the product names are long, and there are enough versions that picking one feels like a decision you could get wrong.

Every product is built on the same five repair ingredients. The differences come down to two questions. What kind of damage does your hair have, and what texture do you like?

This guide walks through every product, what it does, and who it is for. 

What Is Kao THE ANSWER? The Japanese Hair Care Line That Won Number 1

THE ANSWER is a hair care line from Kao Corporation, one of Japan's largest beauty companies. Kao has been researching hair science for over 100 years, and THE ANSWER launched in 2024 as the result of that research. It is positioned as a premium drugstore line, which is a very Japanese category: high-performance formulas at a price that does not require a salon visit.

The line made an immediate impact. At the @cosme Best Cosmetics Awards 2025, Japan's largest consumer-voted beauty awards, the Super Lamellar Shampoo paired with the EX Moist Treatment ranked number one in the Shampoo and Conditioner category. The treatments performed strongly as a group as well, with the EX Repair Treatment, EX Gloss Treatment, and EX Care and Coat Water Serum all placing in the top three of the Hair Treatment Product category at the mid-year awards.

For US customers, this matters because @cosme rankings are voted on by Japanese consumers who have access to every drugstore and department store brand in the country. 

Every product in the line is free of silicones, sulfates, and parabens.

What Lamellar Technology Actually Does, and Why Japanese Shampoo Works Differently

The word "lamellar" gets used constantly in THE ANSWER's marketing, and it is worth understanding because it is the entire point of the line. Lamellar simply means a structure made of very thin, flat layers stacked on top of each other. Think of the pages of a book, or overlapping scales.

Healthy hair has a naturally layered lipid structure inside the shaft. That structure is what keeps moisture in and protects the strand from damage. When hair gets damaged by heat, chemicals, or friction, those layers break down and gaps form.

Kao's Lamellar Platform Technology organizes the repair ingredients into that same thin-layer structure and stores them inside the shampoo foam. Because the ingredients are in lamellar form, they can penetrate and bond to the hair shaft far more effectively than ingredients simply floating loose in a formula.

The practical result: your shampoo is doing repair work while it cleans. Most shampoos strip the hair and rely on a separate conditioner to add something back. THE ANSWER does both at once.

The 5 Repair Ingredients in Every THE ANSWER Product

Before getting into individual products, here are the five ingredients that appear across the entire line. Every product contains all five. The difference between products is which ones are concentrated at higher levels.

• Hydrolyzed keratin: rebuilds the protein structure of damaged strands from the inside
• Ceramide alpha: ceramides rebuild the hair's protective lipid barrier and seal moisture in
• Malic acid: smooths and reseals the outer cuticle layer
• Lanolin fatty acid: restores softness and flexibility to brittle hair
• Olive fruit oil: deeply nourishes and adds shine

Together these five deliver smoother, softer, shinier hair that is protected against heat, friction, humidity, and UV exposure.

Step 1: THE ANSWER Japanese Shampoos for Damaged Hair

There are two shampoos in the line, and the choice between them is straightforward. One is the standard formula. The other is built specifically for hair that reacts to humidity.

Super Lamellar Shampoo

Best for: All hair types, everyday use, any season

This is the core shampoo and the one most people should start with. It uses Lamellar Platform Technology to deliver all five repair ingredients through the foam with every wash, so your hair is being treated at the same time it is being cleaned.

The lather is dense and cushioned rather than squeaky, which is typical of sulfate-free Japanese formulas. It rinses clean without leaving hair feeling stripped or coated. The scent is bergamot and daphne, which reads as fresh and slightly floral rather than sweet.

Massage into wet hair and scalp, work into a full lather, and rinse thoroughly before applying your treatment.

Seasonal SS Super Lamellar Shampoo

Best for: Hair that frizzes, swells, or falls flat in humid weather

Kao calls this the answer to spring and summer hair care. It contains everything the original does, plus one additional ingredient: mannitol.

Mannitol matters more than it sounds like it should. When humidity rises, water moves into the hair shaft, causing it to swell and warp. That swelling is the actual mechanical cause of frizz, not just surface flyaways. Mannitol works by controlling that water movement inside the strand, which stops the swelling before it starts.

The seasonal formula also carries higher concentrations of three of the five core ingredients: ceramide alpha, malic acid, and olive fruit oil. The scent shifts to jasmine and mandarin orange, which is lighter and better suited to warm weather.

Despite the seasonal name, this is not a limited release. Kao sells it year-round, and confirms there is no problem using it in any season.

Super Lamellar vs Seasonal SS: Which Japanese Shampoo Should You Buy?

Both shampoos share the same Lamellar Platform Technology and the same five repair ingredients, so neither one is a downgrade. The Seasonal SS simply adds mannitol for humidity control, carries higher concentrations of ceramide alpha, malic acid, and olive fruit oil, and swaps the scent to jasmine and mandarin orange.

The decision comes down to climate, not hair type. If your damaged hair behaves consistently all year, the original is the simpler choice. If your hair swells, frizzes, or goes limp the moment humidity rises, the Seasonal SS is formulated for exactly that problem.

Step 2: THE ANSWER EX Rinse-Out Treatments for Damaged Hair

This is where the line gets clever. There are four rinse-out treatments, and all of them contain the same five repair ingredients. What changes is which ones are concentrated at a higher level, and that concentration is matched to a specific problem.

Three of them are matched to a damage type: heat, color, and daily wear. The fourth is matched to humidity and pairs with the Seasonal SS shampoo.

This means you are not choosing between a good treatment and a better treatment. You are choosing the one formulated for the problem you actually have.

All four have a rich, slightly stringy texture. Apply to mid-lengths and ends after shampooing, leave for a minute or two, then rinse.

EX Gloss Treatment for Heat Damage

Best for: Regular flat iron, curling wand, and blow dryer users

Heat tools damage hair by raising and roughening the outer cuticle layer. Once that layer is lifted, hair loses shine, catches on itself, and feels rough to the touch.

This treatment concentrates malic acid and lanolin fatty acid. Malic acid works on the cuticle directly, smoothing and resealing the layer that heat lifts. Lanolin fatty acid replaces the softness and flexibility that repeated heat exposure strips away, which is what stops heat-damaged hair from feeling brittle.

The finish is glossy and smooth, which is exactly what heat-damaged hair tends to be missing.

EX Repair Treatment for Color Damage

Best for: Regularly colored or bleached hair that feels dry, porous, or breaks easily

Chemical coloring and bleaching work by opening the hair cuticle to deposit or remove pigment. That process breaks down the lipid barrier inside the hair shaft, which is why colored hair often feels dry and porous no matter how much conditioner you use. The problem is structural, not surface level.

This treatment concentrates ceramide alpha and lanolin fatty acid. Ceramide alpha rebuilds the lipid layer that the chemical process depleted, which addresses the actual cause rather than coating over it. Lanolin fatty acid restores suppleness to strands that have become brittle from repeated processing.

The finish is smooth and noticeably strengthened.

EX Moist Treatment for Daily Damage

Best for: Hair that is not color-treated or heavily heat-styled but still feels dry and hard to manage

This is the one people overlook, and it is also the one that ranked number one at the @cosme awards paired with the Super Lamellar Shampoo.

Daily damage is the accumulation of small things: friction from brushing and pillowcases, UV exposure walking around outside, wind, tying your hair up, and general wear. None of it is dramatic on its own, but it compounds. The result is hair that feels dry and dull without any obvious cause.

This treatment concentrates ceramide alpha and olive fruit oil. Ceramide alpha continuously repairs the moisture barrier that daily wear depletes. Olive fruit oil deeply nourishes and restores the luster that gradually disappears.

The finish is soft, hydrated, and easy to manage.

Seasonal SS EX Treatment for Humidity

Best for: Hair that goes wavy, frizzy, or sticky as soon as humidity rises

The treatment half of the Seasonal SS pair, and the one to reach for if humidity is your real problem rather than heat or color.

Like the matching shampoo, it contains all five core repair ingredients plus mannitol, which controls how water moves inside the hair shaft under high humidity. Kao frames the science in an oddly memorable way: roughly ten to the twenty-first power water molecules exist in a single gram of hair, and managing how they move is what keeps the strand from swelling and warping.

Within THE ANSWER rinse-out treatments, this one carries the highest concentrations of ceramide alpha, olive fruit oil, and malic acid. The texture is noticeably thick, dense enough that it draws a thread when you pull your fingers apart, and it wraps around the hair rather than sliding off. Jasmine and mandarin orange scent, matching the shampoo.

Kao recommends using it daily as a set with the Seasonal SS shampoo. For semi-long hair, roughly a grape-sized amount is the guide.

Step 3: THE ANSWER Leave-In Products

The line includes three leave-in options, all applied to towel-dried hair and not rinsed out. Unlike the treatments, these are not matched to damage type. You choose based on your hair texture and how much weight it can carry.

All three protect against heat, friction, humidity, UV, and dryness. All three can be used morning and night.

EX Care and Coat Water Serum

Best for: Fine, thin, or oil-prone hair that weighs down easily

The lightest of the three. This is a water-based serum that uses Sustained Care Coating Technology to form a long-lasting protective film from roots to ends. It absorbs quickly and leaves no oily residue at all, which makes it usable on the scalp area without causing greasiness.

It placed third in the Hair Treatment Product category at the @cosme mid-year awards in 2025.

Spray or apply to towel-dried hair, comb through, then style as usual.

EX Care and Coat Oil

Best for: Dry, coarse, thick, or curly hair that needs real nourishment

The richest option. It is an oil-based leave-in built on jojoba, camellia, shea, and argan oils. Camellia oil, known as tsubaki in Japan, is a traditional Japanese hair oil that has been used for centuries and is deeply nourishing for hair.

Despite being an oil, the finish is not greasy. It creates a protective coating over the hair shaft and works well for both frizz control and styling.

Warm one to two pumps between your palms and apply to mid-lengths and ends, avoiding the scalp.

Complete Lamellar Milk

Best for: Normal to slightly dry hair, or anyone unsure between the serum and the oil

The middle option, and a good default. This is a hair milk that uses the same Lamellar Platform Technology as the shampoo, now in leave-in form. The texture is creamy and milky, lighter than the oil but with more substance than the water serum.

It can be applied from root to ends without weighing hair down or leaving stickiness.

How to Pick the Right THE ANSWER Products for Your Hair Damage

If you use heat tools most days:

• Shampoo: Super Lamellar Shampoo
• Treatment: EX Gloss Treatment for Heat Damage
• Leave-in: EX Care and Coat Oil for heat protection before styling

If you color or bleach your hair:

• Shampoo: Super Lamellar Shampoo
• Treatment: EX Repair Treatment for Color Damage
• Leave-in: Complete Lamellar Milk

If your hair is just dry and dull with no obvious cause:

• Shampoo: Super Lamellar Shampoo
• Treatment: EX Moist Treatment for Daily Damage
• Leave-in: Complete Lamellar Milk

If humidity and frizz are your main problem:

• Shampoo: Seasonal SS Super Lamellar Shampoo
• Treatment: Seasonal SS EX Treatment, so the mannitol works across both steps
• Leave-in: EX Care and Coat Oil for frizz control

If your hair is fine and weighs down easily:

• Shampoo: Super Lamellar Shampoo
• Treatment: EX Moist Treatment for Daily Damage, applied to ends only
• Leave-in: EX Care and Coat Water Serum

How to Build Your THE ANSWER Routine

The full routine is three steps, and only the first two happen in the shower.

In the shower

• Shampoo: massage into wet hair and scalp, lather fully, rinse thoroughly
• Treatment: apply to mid-lengths and ends, leave one to two minutes, rinse

Out of the shower

• Leave-in: apply to towel-dried hair, comb through, then dry and style as usual

You do not need all three steps to see results. The shampoo and treatment pairing is the core of the system, and it is the combination that won at @cosme. Add a leave-in when you want extra protection before heat styling or on humid days.

FAQ: Common Questions About Kao THE ANSWER

How do you pronounce lamellar?

Luh-MEL-er, with the emphasis on the middle syllable. The middle part rhymes with "bell." It looks harder than it sounds.

Is THE ANSWER good for fine or thin hair?

Yes. Because the formulas are silicone-free, they do not build up or coat the hair the way many repair products do. Apply the treatment to ends only rather than mid-lengths, and choose the EX Care and Coat Water Serum if you want a leave-in.

Can I use THE ANSWER on color-treated hair?

Yes, and the EX Repair Treatment is specifically formulated for it. The line is sulfate-free, which is important for color longevity because sulfates strip color faster.

Do I need the leave-in if I already use the shampoo and treatment?

Not necessarily. The shampoo and treatment together are the core of the system. The leave-in adds protection against heat, humidity, and UV during the day, so it is most useful if you heat style regularly or live somewhere humid.

How long does it take to see results?

Most people notice a difference in texture and shine within two to three washes. Structural repair from ceramide and keratin ingredients builds over time, so give it four to six weeks of consistent use before judging the full effect.

Is the Seasonal SS line only available in spring and summer?

No. Kao developed the Seasonal SS shampoo and treatment for spring and summer hair concerns, but they are sold year-round rather than as a limited release. Physical stores in Japan tend to carry them as a shampoo and treatment pair, while online they are also available individually.

Can I use the Seasonal SS shampoo and treatment in winter?

Yes. Kao confirms there is no problem using them all year. They contain everything the standard versions do plus mannitol, so nothing is missing. They are simply formulated with humidity in mind, which makes them most useful in warm or humid conditions.

Should I use the Seasonal SS shampoo and treatment together?

Kao recommends using them as a pair for the best result, since both carry the mannitol that controls water movement inside the hair. You can mix and match with other THE ANSWER products, but the humidity benefit is strongest when both steps include mannitol.

What does silicone-free actually mean for my hair?

Silicones coat the hair to create instant smoothness, but that coating can build up over time and block other ingredients from getting in. Silicone-free formulas take longer to show a smoothing effect, but the smoothness comes from actual repair rather than a coating.

Final Thoughts: Is Kao THE ANSWER Worth It?

What makes THE ANSWER stand out is not any single ingredient. It is the delivery. Building the repair ingredients into a lamellar structure inside the shampoo foam means the wash step, which is usually the most damaging part of a hair routine, becomes a repair step instead. That is a meaningful shift, and it is why the line won where it did.

If you are starting from scratch, keep it simple. Get the Super Lamellar Shampoo and pair it with the treatment that matches your damage. Heat tools, get the EX Gloss Treatment. Color or bleach, get the EX Repair Treatment. General dryness, get the EX Moist Treatment, which is the pairing that took number one at @cosme. If humidity is what wrecks your hair, get the Seasonal SS shampoo and Seasonal SS EX Treatment as a set.

Give it four to six weeks. Once you see what the system does, adding a leave-in for daily protection is the natural next step. The full Kao THE ANSWER line is available at yukiobeauty.com.