Olaplex No.4 Bond Maintenance Shampoo

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250 mL salon bond-repair pick. Built around patented bis-aminopropyl diglycol dimaleate, which Olaplex says relinks broken disulfide bonds in chemically damaged and bleached hair (independent studies are limited); sulfate-free but not silicone-free (contains amodimethicone), a maintenance shampoo paired with the No.0 and No.3 pre-shower treatments for the full regimen. About 30 dollars per bottle works out to roughly 6x the cost-per-wash of the drugstore tier and is only justified for chemically damaged hair — virgin or lightly heat-styled hair is overkill; no fragrance variety across the line, so fragrance-sensitive users have no alternative scent; No.4 alone without No.0 and No.3 delivers less than the marketing implies.