Best Hair Serums October 2026
Compare top-rated hair serums to discover the right formula for strengthening strands, boosting shine, or soothing your scalp. Our independent ranking highlights key differences in features, bottle sizes, and hair compatibility. Use this guide to quickly weigh advantages and trade-offs before you buy.
Last updated: 1 October 2026
The Ordinary Multi-Peptide Serum for Hair Density 60ml climbed 1 position
Kerastase K Nutritive 8H Magic Night Serum 90ml dropped 2 positions
Hair Oils: Top 5
1
Kerastase Genesis Anti-Breakage Fortifying Serum 90ml
from £26.994 stores
from £26.99
4 stores
2
The Ordinary Multi-Peptide Serum for Hair Density 60ml
from £10.994 stores
1
from £10.99
4 stores
3
Olaplex No.7 Bonding Oil 30ml
from £14.998 stores
from £14.99
8 stores
4
Kerastase K Nutritive 8H Magic Night Serum 90ml
from £30.724 stores
2
from £30.72
4 stores
5
Kerastase Gloss Absolu Glaze Drops Hair Oil 45ml
from £32.993 stores
from £32.99
3 stores
This leave-in scalp serum strengthens distressed strands while promoting healthy hair growth. It works across fine, dry, curly, and color-treated textures to reduce hair loss caused by breakage. The 90 ml bottle delivers daily nourishment for both men and women.
Pros
Strengthens hair to prevent breakage
Stimulates hair growth at the roots
Suitable for all hair types
Generous 90 ml bottle size
Vegan formula
Cons
Higher price tier than budget serums
Leave-in formula may feel heavy if overused
The Ordinary Multi-Peptide Serum is formulated to support hair density, scalp health, and root strength. Its silicone-free formula targets fine, distressed, and sensitive scalps without adding heavy buildup. It provides a focused treatment designed to stimulate fuller-looking hair.
Pros
Formulated specifically for sensitive scalps
Silicone-free and vegan composition
Boosts volume and stimulates growth
Strengthens fine and distressed hair
Cons
Smaller 60 ml bottle
Not formulated for coarse or very curly hair
Olaplex No.7 is a concentrated styling treatment that protects strands against heat damage and UV exposure while adding brilliant shine. It helps smooth frizz and repair damaged bonds across all hair types, including bleached and perm-treated strands. A few drops provide long-lasting softness and thermal defense.
Pros
Provides built-in heat and UV protection
Repairs damage and boosts shine
Sulfate-free and vegan formula
Controls frizz across all hair types
Cons
Small 30 ml bottle size
High cost per milliliter
Kerastase Nutritive 8H Magic Night Serum provides continuous overnight nourishment to restore dry, distressed hair while you sleep. The formula absorbs into lengths and ends to detangle, smooth frizz, and replenish lost moisture without leaving pillows greasy. You wake up to softer, more manageable hair that feels renewed.
Pros
Works overnight for deep hair nourishment
Intensely moisturizes dry and curly textures
Reduces frizz and repairs distressed hair
Generous 90 ml quantity
Cons
Not designed for daytime heat styling
Requires overnight contact to be most effective
Kerastase Gloss Absolu Glaze Drops smooth out unruly frizz and impart an ultra-glossy finish to dry, distressed hair. The lightweight formula restores softness and deeply nourishes damaged fibers without feeling greasy. It is well-suited for finishing your daily routine with polished radiance.
Pros
Adds glossy shine and smoothness
Nourishes dry and distressed strands
Tames frizz effectively
Cons
Limited to 45 ml volume
Lacks specific heat shielding certification
Compare specifications
| Type | Hair serum, Scalp serum, Leave-in-serum | Hair serum, Scalp serum | Hair oil | Hair serum, Scalp serum, Overnight hair serum | Hair oil |
|---|---|---|---|---|---|
| Hair type | Normal, Dry, Colour treated, Fine, Blond/highlighted, Distressed, Curly/permed, Frizzy | Colour treated, Fine, Distressed | Dry, Colour treated, Fine, Sun damaged, Blond/highlighted, Distressed, Curly/permed, Frizzy | Dry, Colour treated, Distressed, Curly/permed, Frizzy | Dry, Distressed, Frizzy |
| Quantity | 90 ml/g | 60 ml/g | 30 ml/g | 90 ml/g | 45 ml/g |
| Features | Prevents hair loss, Strengthening, Stimulates hair growth | For sensitive scalp, Volume, Prevents hair loss, Strengthening, Stimulates hair growth | Shine, Moisturising/softening, Heat shielding, Repairing, Nourishing, Sun screen, Anti-frizz, Smoothing | Shine, Moisturising/softening, Repairing, Nourishing, Anti-frizz | Shine, Moisturising/softening, Repairing, Nourishing, Anti-frizz |
How we create the list
The ranking is updated monthly and is based on data we collect from our own platform. Products that rank highly are popular among our users while also maintaining high quality according to editorial expert assessments. Specifically, we weigh how many users follow the product via price alerts or lists, how it is rated by experts and users, as well as how much traffic it generates to stores and how well it is represented in retail. The texts on this page are AI-generated and created to give you a quick and clear overview. No products are paid placements – the ranking is driven solely by data.
