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Two unlabeled pale yellow bottles in a wet white shower niche, generated illustration
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Olaplex · Hair · Shampoo

Olaplex Nº.4 Bond Maintenance Strengthening Shampoo

A shampoo built around Olaplex's bond ingredient, sulfate-free and color-safe according to the maker. Plenty of owners like it; others ask what the $34 MSRP bought them.

8.5 ozShampooBis-aminopropyl diglycol dimaleateBiotinPanthenolScented
$34 MSRPAmazon price not shown
Check price on Amazon →

Amazon link · we earn a commission if you buy · $34 MSRP · Amazon price not shown · verified Nov 1, 2026. More stores appear here as each affiliate program approves the site.

Buy it if

  • You bleach or color your hair and already use Olaplex
  • You want a shampoo with no sulfates in the maker's free-of list
  • You want a small amount to go a long way, as owners report

Walk past if

  • Your hair runs dry; some owners say it left theirs like straw
  • Your scalp reacts easily; owners report itching and rashes
  • Your hair is healthy and a cheaper shampoo already works

What's in it

The ingredients that do the work, from the maker’s label.

Bis-aminopropyl diglycol dimaleateBiotinPanthenolcontains essential oils

Sulfate-free →

Worth knowing: contains fragrance, contains essential oils.

Full ingredient list, from the maker

Aqua (Water, Eau), Sodium Lauroyl Methyl Isethionate, Cocamidopropyl Hydroxysultaine, Potassium Cocoyl Glycinate, Disodium Cocoyl Glutamate, Potassium Cocoate, Sodium Lauroyl Sarcosinate, Sodium Methyl Isethionate, Glycereth-26, Decyl Glucoside, Bis-Aminopropyl Diglycol Dimaleate, Biotin, Sodium Hyaluronate, Panthenol, Tocopherol, Euterpe Oleracea Fruit Extract, Musa Sapientum (Banana) Fruit Extract, Arctium Lappa Root Extract, Punica Granatum Bark/Fruit Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Camellia Sinensis Leaf Extract, Morinda Citrifolia Fruit Extract, Origanum Vulgare Leaf Extract, Helianthus Annuus (Sunflower) Seed Oil, Prunus Armeniaca (Apricot) Kernel Oil, Argania Spinosa Kernel Oil, Helianthus Annuus (Sunflower) Seed Extract, Hydrolyzed Vegetable Protein PG-Propyl Silanetriol, Palmitoyl Myristyl Serinate, Polyquaternium-10, Polyquaternium-11, Guar Hydroxypropyltrimonium Chloride, Caprylyl Glycol, Amodimethicone, Divinyldimethicone/Dimethicone Copolymer, Sodium Cocoyl Glutamate, Glycol Distearate, Methyl Gluceth-20, Acrylates Copolymer, PEG-120 Methyl Glucose Dioleate, Cocamidopropylamine Oxide, Disodium Laureth Sulfosuccinate, Ethylhexylglycerin, Sodium Lauryl Sulfoacetate, C11-15 Alketh-7, Laureth-9, Trideceth-12, Glycerin, Laureth-10, C12-13 Alketh-23, C12-13 Alketh-3, Quaternium-95, Propanediol, PEG-8, PEG-8/SMDI Copolymer, Lauric Acid, Sodium Laurate, Sodium Polyacrylate, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Trisodium Ethylenediamine Disuccinate, Sodium Sulfate, Acetic Acid, Benzoic Acid, Sodium Benzoate, Citric Acid, Potassium Sorbate, Sodium Hydroxide, Phenoxyethanol, Chlorphenesin, Sodium Chloride, Parfum (Fragrance), Citral, Citrus Aurantium Peel Oil, Hexyl Cinnamal, Limonene, Menthol, CI 19140 (Yellow 5), CI 15985 (Yellow 6)

Where it goes in a routine

Wash day for bleached hair
1 Pre-treatOlaplex Nº.3PLUS Complete Repair Treatment
2 ShampooThis one
3 ConditionOlaplex Nº.5 Bond Maintenance Strengthening Conditioner
4 FinishLeave-in on the ends, then air dry or low heat.

Known issue

Owners report dry, straw-like hair and an itchy scalp, and many see little difference for the money.Walmart and MakeupAlley reviews

What owners say

Filled by the research pass: two or three owner reports from named venues, each linked, each with the date it was read.

If it's not right

Sources

  1. Maker page: ingredient list, 250 ml list price, free-of list, color-safe and dermatologist-tested statements.
  2. Walmart reviews, 8.5 fl oz: stripped, straw-like hair and little visible difference for the price, plus many complaints about thin, leaking or suspect bottles from marketplace sellers.
  3. MakeupAlley reviews, about 3.7 of 5 from 30: scalp rash and itching, dry or frizzy hair, and poor value for some. (read from a search excerpt)

Ingredient lists from the maker's label, not our measurements.