Nettle oil is made by infusing dried stinging nettle leaves in a carrier oil for two to four weeks, allowing the plant’s fat-soluble compounds to transfer into the oil. The process is simple and requires no special equipment, but a few details (especially around moisture and filtration) make the difference between an oil that lasts for months and one that grows mold in days.
What You Need
The ingredient list is short: dried nettle leaves, a carrier oil, a clean glass jar with a lid, and cheesecloth or a fine strainer for filtering. Optional but helpful is vitamin E oil, which acts as a natural antioxidant to extend shelf life.
A standard ratio is 25 grams of dried, ground nettle to 75 grams of carrier oil. This creates roughly a 25% infusion, which is concentrated enough to deliver benefits without making the oil gritty or hard to strain. You can scale up proportionally. If you don’t have a kitchen scale, a loose guideline is to fill your jar about one-third full with dried nettle, then cover completely with oil, leaving at least an inch of oil above the plant material.
Choosing a Carrier Oil
Your carrier oil determines how the finished product feels on your skin or hair, and how long it stays fresh. Olive oil is the most traditional choice for herbal infusions. It has a long shelf life, absorbs well, and is inexpensive. For hair use specifically, your hair type matters more than the nettle itself.
- Fine or oily hair: Grapeseed oil absorbs quickly and won’t weigh hair down.
- Thick, dry, or damaged hair: Coconut oil penetrates deep into the hair shaft rather than sitting on the surface. Avocado oil is another rich option packed with vitamins and unsaturated fats.
- Scalp-focused use: Castor oil is thick and deeply moisturizing, but it’s best diluted or blended with a lighter oil so it spreads easily.
- General skin use: Sweet almond oil or jojoba oil are mild, absorb cleanly, and work for most skin types.
Whichever oil you pick, make sure it’s fresh. An oil that’s already close to going rancid will spoil faster once plant material is added.
Why Drying the Nettle Matters
Fresh nettle leaves contain a lot of water, and water inside an oil infusion creates the perfect environment for mold and bacteria. Using completely dried leaves is the single most important step for safety and shelf life. If you harvest your own nettles, spread the leaves in a single layer on a screen or towel in a warm, well-ventilated area for several days until they crumble easily between your fingers. You can also use a dehydrator set to a low temperature.
If you do want to try fresh nettle (which may retain more of the plant’s water-soluble nutrients like folic acid), you’ll need to sterilize your jar thoroughly and check the infusion at two weeks for any signs of mold. Fresh-nettle infusions carry a real risk of spoiling, so most herbalists recommend sticking with dried leaves.
One note on handling: fresh stinging nettle has tiny hairs on its stems and leaves that release chemicals causing itching and a rash on contact. Wear gloves when harvesting or handling fresh plants. Drying neutralizes the sting completely.
Step-by-Step Cold Infusion Method
The cold infusion (also called maceration) is the most common approach for homemade nettle oil. It takes patience but preserves heat-sensitive compounds.
Start by making sure your glass jar is completely clean and dry. Add 25 grams of dried nettle per 75 grams of oil, or use the one-third jar method described above. Stir gently to make sure all the plant material is submerged. Any leaves poking above the oil line are exposed to air and can develop mold. Seal the jar tightly.
Place the jar on a sunny windowsill or in another warm spot. Warmth helps the oil pull compounds from the leaves more efficiently. Let it sit for two to four weeks, shaking or swirling the jar gently every day or two. Some people infuse for as long as six weeks, but two to four is standard for a well-concentrated oil.
After infusing, strain the oil through a fine filter into a clean, dry jar. This step is worth doing carefully. Cheap cheesecloth often has too loose a weave and lets tiny plant particles through, which shortens shelf life. A coffee filter (paper or stainless steel reusable) works better for getting a truly clean oil. A French press is another effective option. Squeeze or press the plant material gently to extract as much oil as possible, then discard the spent leaves.
Quick Heat Infusion Method
If you don’t want to wait weeks, a gentle heat method can produce nettle oil in a few hours. Place your dried nettle and carrier oil in a double boiler or a heat-safe jar set inside a pot of water. Warm the oil on the lowest heat setting, keeping it well below a simmer. Aim for around 100 to 130°F. Too much heat will degrade the beneficial compounds and can burn the leaves, giving the oil an off flavor and color.
Let it warm for two to three hours, stirring occasionally. Then remove from heat, let it cool, and strain using the same filtering method as the cold infusion. The result won’t be quite as potent as a long cold infusion, but it’s a practical shortcut.
What Transfers Into the Oil
Nettle leaves contain a wide range of beneficial compounds: carotenoids (including beta-carotene, lutein, and lycopene), chlorophyll, terpenes, fatty acids, and flavonoids. The fat-soluble compounds, particularly the carotenoids and chlorophyll, transfer readily into oil during infusion, which is why a well-made nettle oil turns a deep green.
Minerals like iron are a different story. Research on nettle extraction has found that only a tiny fraction of the plant’s iron content actually makes it into liquid extracts. If you’re after nettle’s mineral benefits, eating or drinking the leaves as tea is far more effective. The oil is best suited for topical use, where its fat-soluble antioxidants and anti-inflammatory compounds can work directly on skin and hair.
Using Nettle Oil for Hair and Scalp
Nettle oil is most popular as a hair treatment, and there are a few reasons it works. Nettle contains compounds that can strengthen and relax blood vessels, improving circulation to the scalp and increasing the delivery of oxygen and nutrients to hair follicles. The silica naturally present in nettle supports stronger hair and nails.
Perhaps most notably, nettle extract has been shown to inhibit the formation of DHT, a hormone derived from testosterone that shrinks hair follicles and shortens the hair growth cycle when levels are too high. Nettle works by reducing the enzyme that converts testosterone into DHT, which may help slow thinning in people with hormone-related hair loss.
Nettle’s anti-inflammatory properties also benefit the scalp directly. Chronic scalp inflammation damages follicles over time, contributing to hair fall and thinning. The antioxidants and flavonoids in nettle help neutralize free radicals that drive this damage. For dandruff or an itchy scalp, massaging nettle oil in and leaving it on overnight can be particularly effective.
To use it, warm a small amount between your palms, massage it into your scalp, and work it through your hair. Leave it on for at least 30 minutes (or overnight for a deeper treatment), then wash it out with your normal shampoo.
Storage and Shelf Life
Store your finished nettle oil in a clean glass jar or bottle, ideally dark-colored to protect it from light. Keep it in a cool, dark place. Adding a few drops of vitamin E oil per cup of infused oil helps slow oxidation and can extend its useful life. A well-made, properly filtered infusion using dried herbs and a stable carrier oil like olive oil will typically last several months at room temperature, or longer in the refrigerator.
If the oil develops an off smell, changes color dramatically, or shows any cloudiness or particles after filtering, discard it. These are signs of rancidity or microbial growth. Oils made with fresh plant material or insufficiently dried leaves should be refrigerated and used within a few weeks at most.