Olaplex

No.4 Fine Bond Maintenance™ Volumizing and Strengthening Hair Repair Shampoo

4.5★ · 703 Sephora reviews · #190 Sephora bestseller

GlowGrails score52/100i
Reddit signal54/100i
Evidence4 Reddit discussions
VerdictMixed
Strongest signalhair repair · strengthening

$16–$46.4 at Sephora Make this personal → Add your skin type and products you like.

Why it scored 52

Mixed

4 independent Reddit discussions · Moderate evidence

0 positive2 mixed0 negative2 neutral

Bottom line

Reddit does not show a clear consensus. The strongest use-case signal is hair repair and strengthening. The most common watch-out is damage limits and lack of scientific evidence.

People mention

hair repairstrengthening

Watch-outs

damage limitslack of scientific evidencesilicone contentusage frequency

Representative discussions

Every summary links back to the source discussion.

Mixedr/HaircareScience · 388 points

The discussion questions the scientific basis of Olaplex's claims and the availability of studies supporting its effectiveness, with some users sharing personal experiences and others referencing external research.

Open source →

Mixedr/HaircareScience · 105 points

Users debate the role of silicones in Olaplex No.4 and No.5, with some expressing concerns about potential buildup and others defending the product's formulation and effectiveness.

Open source →

Neutralr/HaircareScience · 793 points

Users discuss the effectiveness and limitations of Olaplex No.4 Fine Bond Maintenance Shampoo in repairing and strengthening hair, with some citing positive results and others expressing skepticism or mixed experiences.

Open source →

View 1 more source-linked discussion

Neutralr/HaircareScience · 55 points

The discussion explores the limits of Olaplex's repair capabilities, how often to use the treatment, and the potential for temporary results, with users sharing their experiences and seeking advice.

Open source →