What Are Fatty Acids and Why Does Your Skin Need Them?
If you have spent any time reading skincare labels or researching natural beauty, you have probably come across the term fatty acids.
It gets mentioned a lot. But it is one of those things that most people nod along to without really knowing what it means or why it actually matters for their skin.
So let us break it down simply. Because once you understand what fatty acids are and what they do, you start to see skincare ingredients very differently.
What are fatty acids?
Fatty acids are a type of fat. They are found naturally in foods, in our bodies, and in many plant and animal based ingredients used in skincare.
Your skin actually produces its own fatty acids as part of its natural oil, known as sebum. These fatty acids are a core component of the skin barrier, that outermost protective layer that keeps moisture in and irritants out.
When your skin has enough of the right fatty acids, the barrier stays strong, flexible, and resilient. When it is deficient in them, the barrier begins to weaken and the skin starts to show it.
Why does your skin need them?
Think of your skin barrier like a brick wall again. The skin cells are the bricks and the fatty acids, along with other lipids, are the mortar holding everything together.
Without enough mortar, the wall develops gaps. Moisture escapes through those gaps. Irritants, bacteria, and environmental pollutants get in through them. And the skin begins to feel dry, tight, reactive, or inflamed as a result.
Fatty acids are essentially the mortar your skin needs to stay intact.
But they do more than just hold the barrier together. Different fatty acids perform different roles in the skin, and understanding a few of the key ones helps explain why ingredient quality matters so much.
The ones worth knowing
Oleic acid is one of the most abundant fatty acids in human sebum. It is deeply moisturising, helps other ingredients absorb more effectively into the skin, and supports softness and suppleness. Skin that is dry or mature tends to respond particularly well to oleic acid rich ingredients.
Linoleic acid is an essential fatty acid, meaning the body cannot produce it on its own and it must come from external sources. It plays a significant role in maintaining the skin barrier and regulating the skin's natural oil production. Skin that is prone to breakouts or congestion is often deficient in linoleic acid.
Stearic acid helps to repair and reinforce the skin barrier. It has a protective quality that helps the skin hold onto moisture and resist environmental stressors. It also gives skincare products a smooth, nourishing texture that absorbs well without feeling heavy.
Palmitic acid is naturally present in human skin and supports barrier function and repair. It tends to decrease as we age, which is one of the reasons skin becomes drier and less resilient over time.
Conjugated linoleic acid has natural anti-inflammatory properties and is found in particularly high concentrations in grass fed animal fats. It supports skin health at a deeper level and is one of the reasons grass fed tallow has such a remarkable effect on inflamed or reactive skin.
Where do fatty acids come from in skincare?
Fatty acids are found in both plant and animal based skincare ingredients, though the profile and bioavailability varies significantly between them.
Plant oils like rosehip, sea buckthorn, sweet almond, and jojoba all contain fatty acids. Each oil has its own unique fatty acid profile, which is why different oils suit different skin types and concerns.
Animal fats, particularly grass fed tallow, contain a fatty acid profile that is remarkably similar to the fats found naturally in human skin. This compatibility is one of the key reasons tallow absorbs so effectively and works so well across a wide range of skin types.
The closer an ingredient's fatty acid profile is to your skin's own natural composition, the more readily your skin can recognise and use it.
Signs your skin might be fatty acid deficient
If your skin is consistently dry despite regular moisturising, feels rough or flaky, is frequently reactive or inflamed, heals slowly, or looks dull and lacklustre, it may be a sign that it is not getting enough of the right fatty acids.
This can come from what you are applying to your skin, but it can also come from what you are eating. Fatty acids in the diet, from foods like oily fish, eggs, nuts, seeds, and quality animal fats, directly support skin health from the inside out.
Skin and nutrition are far more connected than most people realise.
Choosing ingredients that actually deliver
Not all fatty acid rich ingredients are equal. The quality of the source, the way the ingredient is processed, and how compatible it is with your skin all determine how much benefit you actually receive.
This is why we are so particular about the ingredients we use. We are not just looking for ingredients that contain fatty acids on paper. We are looking for ingredients where those fatty acids are present in a form that the skin can genuinely absorb and use.
Because your skin deserves more than the appearance of nourishment. It deserves the real thing.
Read more about our ingredients and the philosophy behind Arise + Glow over on the Journal.
References
- The Role of Linoleic Acid in Skin and Hair Health: A Review. PMC / National Institutes of Health, 2024. PMC
- Essential Fatty Acids and Skin Health. Linus Pauling Institute, Oregon State University. View here
- Topically applied fatty acid-containing formulations repair damaged skin. PubMed, 2024. PubMed
- The permeability barrier in essential fatty acid deficiency: evidence for a direct role for linoleic acid. PubMed. PubMed
- Skin Lipids and Their Influence on Skin Barrier Function. ACS Omega, 2024. View here
The information in this article is intended for general educational purposes only and does not constitute medical advice. If you have a specific skin concern or condition, we recommend consulting a qualified dermatologist or healthcare professional.