CH+
Repair Shampoo CH+Normal to coarse hair
A soft clean
Shampoo ¥4,180
See details
- Ingredients
- PPT-type cleansers, keratin and silk-derived ingredients. Free of sulfates and silicones
- Sizes and prices
- 75mL ¥1,320／280mL ¥4,180／600mL ¥6,820
SALON HAIR CARE BY HOYU, JAPAN
BYKARTEFrom your hair's own chart
The aim: pristine natural hair that has never known damage
18combinations
As many as there are hair types and finishes
The name comes from the medical "karte", the patient chart. The stylist is likened to a doctor for hair who records each person's hair and faces it
Choose the shampoo by hair type, the treatment by finish and leave-in care by texture, from 18 combinations
THE TECHNOLOGY
Cystine, the strength of hair
Cystine supports the strength and suppleness of hair. When color and UV reduce it, the inside of the hair turns hollow
hoyu's own CiP SHOT uses cystine's property of dissolving in alkali and setting in mild acid to replenish it inside the hair. It is used in salon treatments; home products keep that finish and prepare for the next treatment
OUR COMMITMENT
What BYKARTE stands for
- In the name "karte"A stylist as a doctor for hair: a promise to record each person's hair and face it
- Toward natural hairWhat is ideal hair? The answer many salons gave was pristine hair that has never known damage
- Four yearsA vision held for ten years, given form over about four. In 2021, as one answer
- Spread by word of mouthNot through advertising but through the voices of those who tried it, it has spread quietly and surely
- Only chosen salonsOf about 250,000 salons in Japan, only about 1% that have completed training (as announced in 2024–25)
- The nano eyeA large electron microscope looks into hair down to a billionth of a meter
WHAT HAPPENS IN YOUR HAIR
Three things that happen in your hair
Images are for illustration
THE LINES
A prescription for you
FH+
Repair Shampoo FH+Fine, soft hair
A supple clean
Shampoo ¥4,180
See details
- Ingredients
- PPT-type cleansers, keratin and silk-derived ingredients. Free of sulfates and silicones
- Sizes and prices
- 75mL ¥1,320／280mL ¥4,180／600mL ¥6,820
UH+
Repair Shampoo UH+Curl and waves
A fresh clean
Shampoo ¥4,180
See details
- Ingredients
- Sorbitol, sodium saccharin and keratin-derived ingredients work on wavy sections
- Scent
- Fresh pear with patchouli
- Sizes and prices
- 75mL ¥1,320／280mL ¥4,180／600mL ¥6,820
SS+
Serum Treatment SS+Silky
A finish fingers glide through
Treatment ¥4,180
See details
- Ingredients
- Repair amino, 18-MEA derivative, meadowfoam-δ-lactone
- Sizes and prices
- 60g ¥1,320／250g ¥4,180／600g ¥7,920
MS+
Serum Treatment MS+Moist
Moist, soft and cohesive
Treatment ¥4,180
See details
- Ingredients
- Repair amino, 18-MEA derivative, meadowfoam-δ-lactone
- Sizes and prices
- 60g ¥1,320／250g ¥4,180／600g ¥7,920
HS+
Serum Treatment HS+Heavy damage
Moist, smooth, high repair
Treatment ¥4,180
See details
- Ingredients
- Shea butter and murumuru butter added to the shared repair ingredients
- Scent
- Grapefruit and a floral bouquet
- Sizes and prices
- 60g ¥1,320／250g ¥4,180／600g ¥7,920
MASK
Serum MaskOnce or twice a week
Makes the salon finish last longer
Mask ¥2,420
See details
- Formula
- Repair ingredients shared with the salon care, in a formula that heat helps set
- How to use
- Squeeze out water well and work it from mid-lengths to ends, about two cherries' worth for medium hair. Rinse, then dry with heat
- Sizes and prices
- 100g ¥2,420
OIL
Essence OilShine and glide
Protects hair from heat and UV
Oil ¥3,300
See details
- Ingredients
- Ingredients that guard against heat and against UV
- Also
- Essence milk for moisture and cohesion (95mL ¥3,300), concentrate essence for the ends (40g ¥2,200)
- Sizes and prices
- 95mL ¥3,300
Prices are the maker's list prices including tax (checked October 2026). Ask in store for sizes and other items See all products →
HOW TO USE
The bathroom ritual
- CleanseChoose the shampoo by hair type: FH+ for fine hair, CH+ for normal to coarse, UH+ for curl and waves
- NourishChoose the treatment by finish: SS+ for silky, MS+ for moist, HS+ for heavy damage. Serum mask once or twice a week
- ProtectOn towel-dried hair, essence oil or milk, and concentrate essence on the ends, 1 to 3 pearl-sized drops
IN THE SALON
A prescription for your hair, at the salon
At the salon, a system treatment layers several formulas. CiP SHOT, which replenishes cystine, is a technology used in this treatment
Home care keeps the finish of the treatment and prepares hair for the next one
THE STORY
Quietly, surely
A brand born when hoyu, known for hair color, stepped into the field of repair
Within a simple form, the packaging is particular about surface color and finish. The shampoo pump comes packed in the box
- 2021Launched (hoyu, Nagoya)
- 2024UH+ and HS+ join, making 18 combinations
- 2025Serum mask and concentrate essence
AT SEAM
In Ginza, face to face with your hair
SEAM GINZA is on ONE GINZA 3F, a 1-minute walk from Exit 7 of Ginza-itchome Station
Our staff look at your hair and guide you to the right line and order of use. Tax-free at all 7 stores. Please bring your passport