You have probably been using hair oil for a while. Maybe it works well, maybe it does not, and you are not entirely sure why. Your friend swears by coconut oil and her hair looks incredible. You tried the same thing, and your hair felt heavy and greasy for three days. Someone else you know uses argan oil every wash day and gets the frizz control and shine they are after. You tried it and noticed almost nothing. Same products. Completely different results.
Hair porosity is usually the reason. It is one of those concepts that sounds technical but is actually pretty straightforward once you understand it, and once you do, a lot of the confusion around why certain products work for some people and not others starts to make sense. It also changes how you think about which hair oil to use, how to apply it, and what to reasonably expect from it.
This guide covers all of it.
What Is Hair Porosity?
Hair porosity refers to how well your hair absorbs and retains moisture. More specifically, it describes the state of the cuticle, the outermost layer of the hair shaft, made up of overlapping scales a bit like roof tiles. When those scales lie flat and close together, moisture has a hard time getting in and a hard time getting out. This is low porosity hair. When those scales are raised or damaged and sit open, moisture gets in easily but also escapes just as easily. This is high porosity hair. Medium or normal porosity is in between; the cuticle is reasonably intact, moisture absorbs at a normal rate, and stays in the hair at a reasonable rate too.
The state of your cuticle is partly genetic; your natural hair texture plays a role. But it is also heavily influenced by what your hair has been through. Chemical treatments, bleaching, heat styling, UV exposure, hard water, and even just the mechanical stress of daily brushing all lift and damage the cuticle over time, pushing hair toward higher porosity. This is why understanding where your hair sits right now, not just where it started, matters.
The Hair Porosity Test: How to Figure Out Where You Are
There are a few ways to test hair porosity at home. None of them are laboratory-precise, but they give you a workable answer.
The Float Test
Take a few clean strands of hair that have been washed and have no product on them and drop them into a glass of room-temperature water. Leave them for two to four minutes.
If the hair floats near the top: low porosity. The cuticle is tight, and water is not being absorbed.
If the hair sinks slowly to the middle: medium porosity. Water is absorbing at a normal rate.
If the hair sinks quickly to the bottom: high porosity. Water is being absorbed rapidly because the cuticle is open.
The Spray Test
Mist a small section of clean, dry hair with water and watch what happens. Does the water bead up and sit on the hair before slowly absorbing? Low porosity. Does it absorb almost immediately? High porosity. Somewhere in between? Medium.
The Feel Test
Run a strand of hair between your fingers from tip to root against the direction of growth. If it feels smooth and the fingers slide easily, the cuticle is flat, low porosity. If it feels rough, bumpy, or slightly catches as you slide the cuticle is raised; higher porosity. One more practical observation: if your hair takes a long time to get fully wet in the shower and then takes a long time to dry low porosity. If it gets saturated immediately and also dries quickly high porosity.
Low Porosity Hair: What It Means and What It Needs
Low porosity hair has a tightly closed cuticle. That means:
Products sit on top of the hair rather than absorbing, leading to buildup quickly. Your hair may feel coated or weighed down after oiling even when you have not used much. It takes longer to get wet. When you do moisturise it properly, it holds that moisture well. Low porosity hair is not damaged hair. It is often quite healthy structurally. The challenge is getting moisture and beneficial ingredients through the cuticle so they can actually do something.
What helps:
Heat. Warmth opens the cuticle temporarily, allowing products to penetrate. Warming your oil before applying, rolling the bottle between your palms, sitting it in warm water briefly makes a meaningful difference for low porosity hair specifically. Some people steam their hair (a warm towel wrapped around the hair after applying oil) to keep the cuticle open during treatment. Lightweight oils. Heavy oils compound the buildup problem on low porosity hair. You want oils that are light enough to penetrate even a partially closed cuticle rather than sitting on top. More on specific oils below. Less product, more often. A small amount of lightweight oil applied consistently outperforms a heavy application that just sits on the surface and has to be washed off without having absorbed.
High Porosity Hair: What It Means and What It Needs
High porosity hair has a raised, open cuticle either naturally or because of damage. That means:
Moisture absorbs very quickly; your hair gets wet fast in the shower. But it also leaves just as fast, hair dries quickly and often feels dry again shortly after moisturising. Frizz is common because the open cuticle catches moisture from the air inconsistently. Hair is more prone to breakage because the structural integrity of a damaged cuticle is lower. High porosity hair needs moisture but, more importantly, needs sealing products and oils that help close the cuticle down and lock what has been put in from leaving too quickly.
What helps:
Heavier, sealing oils. Oils that coat the outside of the hair shaft and create a barrier against moisture loss are more useful here than lightweight penetrating oils, though a combination of both tends to work best. Leave-in treatments. High porosity hair benefits from oil applied after washing while the hair is still damp the oil seals in the water-based moisture from the wash before it can escape. Protein treatments occasionally. High porosity hair particularly hair that is high porosity due to damage often responds well to protein treatments that temporarily fill in the gaps in the cuticle. Not every wash, but periodically as part of a maintenance routine.
Best Hair Oil for Low Porosity Hair
The non-negotiable for low porosity hair: lightweight oils that can penetrate a tight cuticle, or at least get between the cuticle scales rather than sitting on top of them.
Jojoba oil is probably the best single oil for low porosity hair. Its molecular structure is the closest to the scalp's own sebum it is light, non-comedogenic, and does not build up the way heavier oils do. It absorbs reasonably well even into a tighter cuticle and does not leave a heavy residue that needs to be washed off every time.
Argan oil is another strong option for low porosity hair. Lightweight, high in oleic acid and vitamin E, smooths the cuticle without the heaviness of oils like castor or coconut. Works well as a finishing oil on damp low porosity hair for frizz control and shine.
Grapeseed oil is one of the lightest natural oils available. It has almost no residue, absorbs quickly, and will not contribute to buildup, making it a good daily option for low porosity hair that struggles with product accumulation.
Sweet almond oil sits in the middle in terms of weight, lighter than coconut, heavier than grapeseed. Good as a carrier oil for essential oils and works well on low porosity hair that needs some moisture without the heaviness.
What to avoid for low porosity hair: Heavy, thick oils like castor, olive, or straight coconut oil applied to the lengths and scalp as a regular treatment. They are difficult to get through the cuticle and tend to sit on the surface, leaving low porosity hair feeling coated and looking dull.
Application tip for low porosity hair: Always warm the oil. Always. The difference in absorption between cold oil and slightly warmed oil on low porosity hair is significant. And apply on damp rather than dry hair; where possible, the slight openness of a damp cuticle helps the oil get in.
Best Hair Oil for High Porosity Hair
High porosity hair needs a different strategy. The priority is sealing using oils that help close down the raised cuticle and lock moisture in.
Castor oil is the heavy hitter for high porosity hair. Its thick consistency and high ricinoleic acid content make it a strong sealant; it coats the hair shaft and creates a barrier that slows moisture loss. Used on the lengths and ends of high porosity hair, it reduces frizz, reduces breakage, and helps the hair hold onto whatever moisture it has absorbed. It is best blended with a lighter oil before application because it is too thick to spread evenly on its own.
Coconut oil is one of the few oils that actually penetrates the hair shaft rather than just coating it. Research shows it significantly reduces protein loss from the hair, which matters for high porosity hair that has been damaged. It works as both a penetrating treatment and a partial sealant, which makes it genuinely useful for high porosity hair that needs both.
Tamanu oil is dense, richly nourishing, and anti-inflammatory, useful for high porosity hair that is also dealing with a sensitive or irritated scalp. It repairs the scalp at a cellular level and helps rebuild the lipid barrier that damaged, high porosity hair is often missing.
Moringa oil works well on high porosity hair because of its behenic acid content a fatty acid that helps smooth the cuticle and reduce frizz structurally rather than just coating it. For high porosity hair that struggles with frizz even after moisturising, moringa addresses the cuticle-smoothing side directly.
Avocado oil is rich, penetrating, and packed with fatty acids good for very damaged or chemically treated high porosity hair that needs deep nourishment. Heavier than argan but lighter than castor, it sits in a useful middle ground for high porosity hair that needs real moisture without quite as much sealing.
What to avoid for high porosity hair: Very light, fast-absorbing oils used alone without a sealant. Grapeseed or sweet almond alone on high porosity hair will absorb quickly and then the moisture will escape just as quickly. They work much better paired with a heavier sealant or used as part of a layered routine: moisture first, then oil to seal.
Application tip for high porosity hair: Apply oil to damp hair immediately after washing while the hair is still wet; the oil seals the water into the hair shaft before it can evaporate. For very high porosity hair, the LOC method (Leave-in conditioner, Oil, Cream) or LCO method helps layer products in a way that maximises moisture retention.
Where Klarivie Growth Reload Hair Oil Fits
Klarivie Growth Reload Hair Oil is a scalp-first formula it is built for follicle and scalp health rather than being primarily a hair conditioning product. That means it works across porosity types in a specific way that is worth understanding. Applied to the scalp, which is its primary purpose porosity is less of a factor. Scalp skin absorbs oil differently from the hair shaft, and the growth-supporting ingredients in Klarivie (rosemary, peppermint, gotu kola, pumpkin seed) are doing their work at the follicle level regardless of hair porosity.
For the hair lengths:
On low porosity hair, Klarivie's formula is lightweight enough to not cause significant buildup when used as directed: six to ten drops on the scalp with whatever remains worked through the lengths. The moringa and tamanu contribute some cuticle-smoothing benefit even on a tighter cuticle. Warm the oil before applying for best absorption.
On high porosity hair, Klarivie works well as a scalp treatment and mid-length conditioner, but high porosity hair that needs significant sealing of the lengths and ends may benefit from pairing it with a heavier sealant oil (castor or coconut) on the ends after the Klarivie scalp application. Think of Klarivie handling the scalp and upper length, with a targeted sealant on the ends.
On medium porosity hair, Klarivie is a complete routine on its own it addresses scalp health, supports growth, and conditions the lengths without being too heavy or too light.
Hair Oil for Damaged Hair: A Note on Porosity and Recovery
Most damaged hair is high porosity hair. Bleaching lifts the cuticle open. Heat styling does the same over time. Chemical treatments alter the hair's protein structure. Australian UV exposure contributes to oxidative damage of the cuticle. If your hair is high porosity because it is damaged rather than naturally high porosity, the goal of oil treatment is slightly different. You are not just sealing and moisturising. You are supporting recovery of the cuticle and protecting against further damage while the hair grows out.
Coconut oil's protein-loss reduction is particularly relevant here. Tamanu oil's cellular repair and anti-inflammatory properties matter. Moringa's antioxidant content helps neutralise some of the oxidative damage that UV and heat styling cause over time. The damage itself cannot be reversed; damaged hair only truly recovers as it grows out and is replaced with new growth. But the right oil routine slows further damage, improves the condition of the damaged hair you have, and supports the scalp and follicle health that determines what the new growth looks and feels like.
Quick Reference: Porosity and Oil Matching
If you want the short version:
Low porosity: Jojoba, argan, grapeseed, sweet almond. Lightweight, fast-absorbing. Always warm before applying. Apply to damp hair. Avoid buildup-prone heavy oils on the scalp and lengths.
Medium porosity: Most oils work. A balanced botanical blend like Klarivie suits medium porosity hair well as a complete routine. Neither extreme of very heavy nor very light is needed.
High porosity: Coconut for penetration and protein loss reduction. Castor or tamanu for sealing the lengths and ends. Moringa for cuticle smoothing. Apply to damp hair immediately after washing. Layer with a sealant on the ends.
Damaged hair: Coconut oil as a pre-wash protein-protective treatment. Tamanu for cellular repair. Antioxidant-rich oils (moringa, argan) for UV and oxidative protection. Scalp health support for better new growth.
Final Thoughts
Hair porosity is not a complicated concept once you know what you are looking at. And once you do, the whole world of hair oil recommendations starts to make more sense because the reason a product works brilliantly for someone else and does nothing for you is usually not the product. It is the mismatch between the oil and what your specific cuticle structure needs. Test your porosity. Match your oil weight to your porosity type. Adjust application method: warm oil for low porosity, damp hair application for high. And give the routine enough time to show results before switching. The right oil for your hair type is not a mystery. It is just a question of knowing what you are working with.
Klarivie Growth Reload Hair Oil Australian-made, botanically formulated, and designed for scalp health across all hair types and porosity levels. Available at klarivie.com.au
