Olaplex makes a fine-hair shampoo and conditioner, Nº.4FINE and Nº.5FINE, and if your hair is fine those are the ones to buy, not the famous originals. Olaplex's own page says the original Nº.4 and Nº.5 are for medium to coarse hair.
What Olaplex cannot do is treat thinning. Bond building works on the hair shaft, not the follicle, and no Olaplex product claims to grow hair. Below is the range sorted for fine hair, with prices from Olaplex's site and what each claim actually measured.
a shampoo bottle, a conditioner bottle and a small serum bottle on a pale bathroom shelf, soft daylight
This guide is independent and unpaid. Every size, price and ingredient below was checked on Olaplex's own product pages in October 2026, and we link to the brand directly.
From the editor
Most fine-haired clients who tell me Olaplex made their hair flat were using Nº.5, Nº.6 or Nº.7. Those are rich, silicone-forward products made for hair that needs smoothing.
Olaplex is genuinely useful for fine hair that has been bleached or coloured. For fine hair that has never been processed, you are mostly paying for a nice shampoo.
MH
— Megan Holloway, Editor-in-Chief
The short verdict
Fine hair: Nº.4FINE and Nº.5FINE, sold together as the Double Volume Fine Hair Set ($61). Fine and bleached: add Nº.3PLUS on the lengths before you wash. Leave-in: Nº.9 Bond Protector, the lightest Olaplex styler.
Skip or limit: the original Nº.4 and Nº.5, Nº.6 Bond Smoother and Nº.7 Bonding Oil. All carry silicones high in the ingredient list.
What bond building does, and what it can't do
Olaplex's patented ingredient, bis-aminopropyl diglycol dimaleate, is sold as rebuilding the disulfide bonds that bleach and colour break. A 2025 lab study found Olaplex Nº.0 measurably improved the strength of bleached hair fibres.
The mechanism is less settled. A 2021 spectroscopy study of maleate-type treatments on bleached hair found no increase in disulfide bonds in the hair cortex, although the surface looked smoother. Either way, the effect is on hair that has been chemically damaged.
None of this touches the follicle, which is where thinning happens. The American Academy of Dermatology names minoxidil as the most recommended treatment for female pattern hair loss; see thinning hair treatment for the options.
The best Olaplex products for fine hair
Olaplex No.4FINE Bond Maintenance Volumizing Shampoo bottle, product packshot on white
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Best Olaplex shampoo for fine hair: Nº.4FINE Bond Maintenance Volumizing Shampoo
A sulfate-free, silicone-free shampoo with flexible styling polymers, a low-molecular-weight hyaluronic acid and the bond builder tenth in the list. Olaplex claims "2X volume" and "2X stronger" when it is used with Nº.5FINE.
Sizes: 100 mL $16, 250 mL $34, 525 mL $56, 1 L $96. Honest limitation: the volume comes from polymers that wash out, and Olaplex does not publish how its "2X" figures were measured. It also contains fragrance and two yellow dyes.
Olaplex No.5FINE Bond Maintenance Volumizing Conditioner bottle, product packshot on white
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Best Olaplex conditioner for fine hair: Nº.5FINE Bond Maintenance Volumizing Conditioner
Silicone-free, with oils only low in the list. Olaplex says it "will not weigh down fine hair over time" and claims 90% easier detangling.
Sizes: as Nº.4FINE, or $61 for both 250 mL bottles in the Double Volume Fine Hair Set. Honest limitation: it is still a fatty-alcohol cream, so keep it to the mid-lengths and ends, as Olaplex's own directions say.
Olaplex No.3PLUS Complete Repair Treatment bottle, product packshot on white
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For fine hair that is bleached: Nº.3PLUS Complete Repair Treatment
A three-minute pre-shampoo treatment that has replaced the standalone Nº.3 Hair Perfector in the US. Olaplex claims "3X stronger" hair after four uses, tested on bleached hair.
Sizes: 100 mL $34, 250 mL $68. Honest limitation: it contains shea butter and several oils, and the label says roots to ends. On fine hair, apply it to the lengths only, and only if your hair is chemically processed.
Olaplex No.9 Bond Protector Nourishing Hair Serum bottle, product packshot on white
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Best Olaplex leave-in for fine hair: Nº.9 Bond Protector Nourishing Hair Serum
A water-based, silicone-free leave-in with heat protection to 450°F. It is the lightest styling product Olaplex makes, and our best serum for fine hair ranks it first.
Price: $32. Honest limitation: it protects and smooths a little; it does not add volume.
Olaplex Volumizing Blow Dry Mist spray bottle, product packshot on white
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For blow-dry lift: Olaplex Volumizing Blow Dry Mist
A silicone-free volumizing spray with PVP, a maltodextrin copolymer, bamboo extract and pea peptide. Olaplex reports that 94% of 43 women with fine to medium hair saw buildable volume.
Price: $32. Honest limitation: that figure is self-reported, and the lift comes from film-forming polymers like any volumizing spray.
Olaplex No.4D Clean Volume Detox Dry Shampoo aerosol can, product packshot on white
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For second-day roots: Nº.4D Clean Volume Detox Dry Shampoo
A silicone-free aerosol dry shampoo with rice starch, bentonite and zeolite to soak up oil. In Olaplex's study of 30 people, all reported no white residue after three uses.
Sizes: 6.3 oz $30, 1.13 oz $16. Honest limitation: the volume is starch grip, not repair. On a thinning scalp, wash rather than layering dry shampoo day after day.
Olaplex Scalp Longevity Treatment bottle with applicator, product packshot on white
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Olaplex for the scalp: Scalp Longevity Treatment
Olaplex's only scalp product: a leave-in with ceramides, hyaluronic acid and the bond builder, used three times a week. It reports a "51% improved scalp barrier in 14 days" from a 16-week dermatologist-supervised test of 25 people.
Size: 50 mL, $44. Honest limitation: it makes no claim about shedding, density or growth, so do not buy it as a thinning treatment.
Nº.4 and Nº.5 (the originals) are made, in Olaplex's words, for medium to coarse textures. Nº.5 carries a dimethicone copolymer, amodimethicone and argan, avocado and grape-seed oils.
Nº.6 Bond Smoother lists dimethicone third, and Nº.7 Bonding Oil lists dimethicone first. Both are good on frizz; on fine hair use half a pump or one drop on the ends, or skip them.
The Weightless Nourishing Mask ($44) is sold for fine to medium hair, but it also contains amodimethicone and dimethicone. Use it on the lengths and rinse well.
Do you need Nº.0 for fine hair?
Only if your hair is bleached, coloured or relaxed. Nº.0 is four ingredients, water, the bond builder and two preservatives, and Olaplex itself says it is not meant to be used alone. On fine hair that has never been processed there is nothing for it to repair.
In 2023 a group of customers sued Olaplex, alleging its products caused hair loss and breakage, and NPR reported that the complaint pointed to lilial, a fragrance ingredient the EU phased out in 2022. These were allegations, never decided by a court.
According to Olaplex's own annual report to the SEC, the court dismissed the claims in July 2023, the last plaintiff withdrew, and none had re-filed. None of the current ingredient lists we read in October 2026 contains lilial.
If you notice new shedding after any product change, stop the product and see a dermatologist, and read why is my hair thinning? for the common causes.
A simple Olaplex routine for fine hair
If your hair is lightened, apply Nº.3PLUS to damp lengths for three minutes. Wash with Nº.4FINE, condition from the ears down with Nº.5FINE, then mist Nº.9 on towel-dried hair before blow-drying.
On second day, a short burst of Nº.4D at the roots is enough. Our how to blow-dry fine hair guide covers the drying itself.
FAQ
Parts of it are. Nº.4FINE and Nº.5FINE are made for fine hair and are silicone-free. The original Nº.4 and Nº.5, Nº.6 and Nº.7 are richer and carry silicones, so they tend to flatten fine hair. Olaplex helps most when fine hair has been bleached or coloured.
Nº.4FINE Bond Maintenance Volumizing Shampoo. It is sulfate-free and silicone-free with flexible styling polymers, and Olaplex sells it with Nº.5FINE as the Double Volume Fine Hair Set for $61.
It can make thin, damaged hair stronger and easier to style, but it does not treat thinning. Bond builders work on the hair shaft, not the follicle, and no Olaplex product claims to grow hair or reduce shedding.
Nº.4FINE is the volumizing, silicone-free version for fine hair. The original Nº.4 is for medium to coarse hair, according to Olaplex, and contains amodimethicone and argan oil.
A 2023 lawsuit alleged that it did, but the claims were dismissed and not re-filed, according to Olaplex’s SEC filings, and they were never proven. The current ingredient lists we checked do not contain lilial, the ingredient the complaint focused on.
Often, yes. Dimethicone is its first ingredient. On fine hair, use one drop on dry ends only, or choose the water-based Nº.9 Bond Protector instead.
Yes, the Scalp Longevity Treatment, a leave-in for scalp hydration and barrier. It makes no claims about hair growth, shedding or density.
Sizes, prices and ingredients were checked on Olaplex’s official site in October 2026; formulas and prices change, so check the label before you buy. This guide is independent; Olaplex did not see it or pay for it.
Images in this article are AI-generated illustrations, not photos of real clients or results. See our image policy.
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