Vitamin F (Linoleic Acid) for Hair: What the Research Shows

"Vitamin F" is the name sometimes given to essential fatty acids such as linoleic acid. In the lab, linoleic acid activated hair-growth signalling in human dermal papilla cells, and reviews say topical linoleic acid and linoleic-acid-rich oils show hair-growth effects in animal and cell models. We found no clinical trial of linoleic acid for hair in people.

Here's what the research shows and what it doesn't.

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Key Takeaways

• Linoleic acid is an essential omega-6 fatty acid that plays a role in skin barrier function.
• In human dermal papilla cells, linoleic acid activated Wnt/β-catenin signalling, increased several growth factors and reduced DKK-1, a signal linked to hair loss.
• Reviews say linoleic acid or linoleic-acid-rich oils applied to skin show hair-growth effects in animal and skin-cell studies, and call for clinical research.
• We found no clinical trial of linoleic acid for hair growth in people.

What Is Linoleic Acid?

Linoleic acid (18:2, omega-6) is an essential fatty acid, meaning the body needs it from the diet. It's incorporated into skin lipids, including ceramides that support the skin barrier.

Does Linoleic Acid Help Hair?

Possibly, based on lab work, but it hasn't been shown in people. The idea comes from cell studies, not trials.

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Using Linoleic Acid Oils

• Think of it as a skin and scalp conditioner, with lab-stage hair evidence.
• Oil choice matters. Oils with more linoleic than oleic acid have better skin-barrier repair potential.
• See a dermatologist for the cause of hair loss.

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What The Research Shows

A Review Of Linoleic Acid In Skin And Hair

A 2024 review describes linoleic acid as an essential fatty acid that can be metabolized into other omega-6 fatty acids and incorporated into complex lipids, including omega-hydroxy-ceramides. It reports that animal and skin-cell studies suggest linoleic acid or linoleic-acid-rich oils, applied topically, have effects including skin barrier repair, photoprotection, anti-inflammatory effects and stimulation of hair growth. It calls for more investigation of clinical application (Wang et al., 2024).

Hair Follicle Cells In The Lab

In human follicle dermal papilla cells, linoleic acid activated Wnt/β-catenin signalling, increased cyclin D1 and several growth factors (VEGF, IGF-1, HGF, KGF) in a dose-dependent way, and significantly inhibited DKK-1, a primary signalling molecule in dihydrotestosterone-related alopecia (Ryu et al., 2021). This was cell research.

Which Oils

A review of natural oils for skin-barrier repair found that oils with a higher linoleic-to-oleic acid ratio have better barrier-repair potential, whereas oils with more oleic acid, which is irritating, may be detrimental. Cold pressing preserves beneficial lipids (Vaughn et al., 2018). That review was about skin, not hair.

One oil people ask about that contains fatty acids is batana oil.

See also: Phytoceramides for Hair: What They Are and What the Research Shows · Pomegranate Seed Oil for Hair: What the Research Shows

To see how this fits with the other nutrients hair needs, read our guide to the best vitamins for hair growth.

Frequently Asked Questions

Does linoleic acid help hair growth?

In the lab it activated hair-growth signalling in follicle cells. We found no clinical trial in people.

What is vitamin F?

A name sometimes used for essential fatty acids such as linoleic acid.

Is linoleic acid safe?

Patch test any new oil and stop if you notice irritation. Talk to your doctor if you have a skin condition.

References

1. Wang X, Jia Y, He H. The Role of Linoleic Acid in Skin and Hair Health: A Review. Int J Mol Sci. 2024. PubMed
2. Ryu HS, Jeong J, Lee CM, et al. Activation of Hair Cell Growth Factors by Linoleic Acid in Malva verticillata Seed. Molecules. 2021. PubMed
3. Vaughn AR, Clark AK, Sivamani RK, et al. Natural Oils for Skin-Barrier Repair: Ancient Compounds Now Backed by Modern Science. Am J Clin Dermatol. 2018. PubMed