Hair oils have gone from an occasional finishing touch to a daily essential, but do they actually work, and is oiling your hair good for it? Here is what hair oil does, who benefits most, and how to use it without ending up greasy.
What does hair oil actually do?
A good hair oil works on two levels. On the surface, it smooths the cuticle to add shine, tame frizz and reduce friction while styling. Used as a pre-wash treatment, some oils also soften and condition the hair so it feels stronger and looks healthier.
What oil cannot do is permanently repair or feed hair, because hair is not living tissue. So the goal is to protect, smooth and add slip, not to fix damage at its source.
Is hair oil right for your hair type?
- Dry, frizzy or curly hair: yes, this is where oils shine. They seal in moisture and define texture.
- Fine or oily hair: use sparingly. Choose a lightweight, fast-absorbing oil and keep it to the mid-lengths and ends.
- Coloured or heat-styled hair: a light oil adds a protective layer and boosts shine.
How to use hair oil without the grease
- Start with less than you think, one or two drops for fine hair and a little more for thick or curly hair.
- Warm it between your palms, then apply to damp or dry mid-lengths and ends, never the roots.
- For a deeper treatment, apply to the lengths an hour before washing, then shampoo as normal.
Insight's Oil Non Oil gives shine and nourishment with a weightless, non-greasy finish, while the Illuminating Hair Oil-Serum adds high gloss to smooth styles. For curls, Bouncy Curls Hair Oil is a curly hair oil that defines without weighing curls down.
Hair Oil Results and Pro Tips
Lorraine Matic, Insight Professional's Head of Education, loves to combine Replenishing Thermal Care Serum with Oil Non Oil before a blow-dry for protection and shine.
During Insight Education Course, Grey Blending 22nd June 2026, this beautiful lived in blonde was created and styled using Lorraine's pre-blow-dry formula. The shine speaks for itself. Colour and finish by the talented Sarah Peatling @Sarah_emmahallhair.
The takeaway
Used correctly, hair oil is genuinely good for most hair: it protects, smooths and adds shine. The trick is matching the weight of the oil to your hair type and using just enough.
Browse Insight's vegan hair oils and serums, all cruelty-free and sustainably made.
About the author
Charlotte Read has spent six years in the hair industry with Insight Professional and holds a First Class BSc in Business Management and Marketing. She writes with reference to real salons across social media and the wider Insight community, and draws on the Insight office team, who between them bring over 100 years of combined experience on salon floors.
Where technical expertise is needed, Charlotte consults Lorraine Matic, Head of Insight UK Education, who brings over 38 years of global experience in colour, technique and hair science.