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Compare · Shampoos

K18 Peptide Prep Detox Shampoo vs No. 4 Bond Maintenance Shampoo: which is better?

The choice comes down to hard-water and product-buildup cleansing versus bond-focused care for processed lengths.

Reddit’s pick

K18 Peptide Prep Detox Shampoo

$39.00 at Amazon

  • Rated higher: K18 Peptide Prep Detox Shampoo — 73 vs 54 nextscore 
  • Cheaper per ml: No. 4 Bond Maintenance Shampoo — $0.12 vs $0.16/ml

K18 Peptide Prep Detox Shampoo has the more clearly positive verdict balance, with praise for hard-water and product-buildup removal and a clean finish without a straw-like feel.

Choose K18 Peptide Prep Detox Shampoo if

  • you need help with hard-water or product buildup
  • your scalp tolerates a strong clarifying wash

Choose No. 4 Bond Maintenance Shampoo if

  • your hair is processed or prone to breakage
  • you want a thorough cleanse with a soft finish

At a glance

K18 Peptide Prep Detox ShampooNo. 4 Bond Maintenance Shampoo
Price per ml
$0.16/ml$0.12/ml
nextscore
73 · 62 verdicts54 · 139 verdicts
Key ingredients
Salicylic Acid, Peptides—

Prices checked Nov 12

What Reddit says

K18 Peptide Prep Detox Shampoo

What Reddit likes

  • Salicylic acid clarifies scalp while tackling buildup
  • Hard-water helper for mineral buildup
  • Squeaky-clean finish without straw-like feel

Watch out for

  • Too strong for some scalps, triggering itchiness and flakes
  • Can dry highlighted or damaged lengths
  • May flatten hair or leave a stubborn residue
See the Reddit threads on K18 Peptide Prep Detox Shampoo

$39.00 at Amazon

No. 4 Bond Maintenance Shampoo

What Reddit likes

  • Bond-building active for processed, breakage-prone lengths
  • Cuts hard-water buildup while cleansing thoroughly
  • Dense lather leaves hair soft and clean

Watch out for

  • Fine hair can end up flat, greasy, or coated
  • Frequent washing can trigger scalp itch, dryness, and dandruff
  • Protein-heavy routines can worsen brittleness, tangles, and shedding
See the Reddit threads on No. 4 Bond Maintenance Shampoo

$14.79 at Stylevana

Compare full ingredient lists · 9 in common

In both · 9

  1. Water (Aqua) (Eau)
  2. Cocamidopropyl Hydroxysultaine
  3. Panthenol
  4. Glycerin
  5. Guar Hydroxypropyltrimonium Chloride
  6. Caprylyl Glycol
  7. Citric Acid
  8. Sodium Hydroxide
  9. Limonene

Only in K18 Peptide Prep Detox Shampoo · 9

  1. Sodium C14-16 Olefin Sulfonate
  2. Salicylic Acid
  3. Charcoal Powder
  4. SH-Oligopeptide-78
  5. Sodium Phytate
  6. Caprylhydroxamic Acid
  7. Potassium Hydroxide
  8. Fragrance (Parfum)
  9. Benzyl Salicylate

Only in No. 4 Bond Maintenance Shampoo · 69

  1. Sodium Lauroyl Methyl Isethionate
  2. Potassium Cocoyl Glycinate
  3. Disodium Cocoyl Glutamate
  4. Potassium Cocoate
  5. Sodium Lauroyl Sarcosinate
  6. Sodium Methyl Isethionate
  7. Glycereth-26
  8. Decyl Glucoside
  9. Bis-Aminopropyl Diglycol Dimaleate
  10. Biotin
  11. Sodium Hyaluronate
  12. Tocopherol
  13. Euterpe Oleracea Fruit Extract
  14. Musa Sapientum (Banana) Fruit Extract
  15. Arctium Lappa Root Extract
  16. Punica Granatum Bark/Fruit Extract
  17. Rosmarinus Officinalis (Rosemary) Leaf Extract
  18. Camellia Sinensis Leaf Extract
  19. Morinda Citrifolia Fruit Extract
  20. Origanum Vulgare Leaf Extract
  21. Helianthus Annuus (Sunflower) Seed Oil
  22. Prunus Armeniaca (Apricot) Kernel Oil
  23. Argania Spinosa Kernel Oil
  24. Helianthus Annuus (Sunflower) Seed Extract
  25. Hydrolyzed Vegetable Protein PG-Propyl Silanetriol
  26. Palmitoyl Myristyl Serinate
  27. Polyquaternium-10
  28. Polyquaternium-11
  29. Amodimethicone
  30. Divinyldimethicone/Dimethicone Copolymer
  31. Sodium Cocoyl Glutamate
  32. Glycol Distearate
  33. Methyl Gluceth-20
  34. Acrylates Copolymer
  35. PEG-120 Methyl Glucose Dioleate
  36. Cocamidopropylamine Oxide
  37. Disodium Laureth Sulfosuccinate
  38. Ethylhexylglycerin
  39. Sodium Lauryl Sulfoacetate
  40. C11-15 Alketh-7
  41. Laureth-9
  42. Trideceth-12
  43. Laureth-10
  44. C12-13 Alketh-23
  45. C12-13 Alketh-3
  46. Quaternium-95
  47. Propanediol
  48. PEG-8
  49. PEG-8/SMDI Copolymer
  50. Lauric Acid
  51. Sodium Laurate
  52. Sodium Polyacrylate
  53. Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
  54. Trisodium Ethylenediamine Disuccinate
  55. Sodium Sulfate
  56. Acetic Acid
  57. Benzoic Acid
  58. Sodium Benzoate
  59. Potassium Sorbate
  60. Phenoxyethanol
  61. Chlorphenesin
  62. Sodium Chloride
  63. Parfum (Fragrance)
  64. Citral
  65. Citrus Aurantium Peel Oil
  66. Hexyl Cinnamal
  67. Menthol
  68. CI 19140 (Yellow 5)
  69. CI 15985 (Yellow 6)

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