Making natural oil at home typically means one of two things: infusing a carrier oil with herbs or flowers to capture their properties, or extracting essential oil from plant material through steam distillation. Both are doable at home with basic equipment, though they produce very different products. Infused oils are the easiest starting point and require nothing more than dried herbs, a good carrier oil, and patience.
Infused Oils vs. Essential Oils
An infused oil is a carrier oil (like olive, almond, or jojoba) that has absorbed the beneficial compounds from herbs or flowers soaked in it over time. You use it directly on skin, in cooking, or as a base for salves and balms. An essential oil is a concentrated volatile extract pulled from plant material through distillation. It takes large quantities of raw material to produce even a small amount. Lavender varieties, for example, require roughly 250 grams of flower heads to yield just a few milliliters of oil, and some cultivars produce significantly less than others.
For most home projects, infused oils are the practical choice. They’re safer to handle, cheaper to produce, and versatile enough for skincare, massage blends, and kitchen use.
Choosing Your Carrier Oil
Your carrier oil is the foundation of any infusion, so picking the right one matters. The main consideration is how quickly the oil goes rancid. Oils high in polyunsaturated fats (like grapeseed or hemp seed) oxidize fastest and have the shortest shelf life. Monounsaturated oils like olive, sweet almond, and avocado sit in the middle and work well for most infusions. Jojoba is technically a liquid wax, not an oil, which makes it exceptionally stable and resistant to spoilage.
For skincare infusions, sweet almond and jojoba are popular because they absorb well and have mild scents. For culinary infusions, extra virgin olive oil is the standard. Whatever you choose, start with a high-quality, cold-pressed version. Refined oils have fewer of their own beneficial compounds and can introduce off-flavors.
Preparing Your Plant Material
This step is the single most important thing you can do to ensure a safe, long-lasting product. Fresh herbs contain a high percentage of water: basil starts at roughly 88% moisture, and mint at about 71%. That moisture, once trapped inside oil, creates the perfect low-oxygen environment for dangerous bacterial growth, including Clostridium botulinum, the organism responsible for botulism.
Drying your herbs down to around 10% moisture content eliminates this risk. In warm, sunny weather, spreading herbs in a single layer outdoors can get basil dry enough in as little as two hours and mint in about 30 minutes. In cooler conditions, the same process can take five to six hours or longer. You can also use a food dehydrator set to a low temperature or dry herbs in an oven at its lowest setting with the door cracked. The herbs should crumble easily between your fingers when they’re ready.
If you want to use fresh herbs (particularly garlic, basil, oregano, or rosemary), there’s an important safety step. Penn State Extension recommends acidifying fresh ingredients by soaking them in a 3% citric acid solution before adding them to oil. For garlic, use one part chopped garlic to three parts citric acid solution. For herbs with leaves still on the stems, use one part herbs to ten parts solution, and soak for at least 24 hours. Even with this treatment, refrigerate the finished oil and use it within a few days for fresh herbs, or up to three months for dried.
The Cold Infusion Method
This is the simplest approach and works especially well for delicate flowers like calendula, chamomile, and lavender.
- Fill a clean, dry glass jar about halfway to two-thirds full with your dried plant material. Pack it loosely.
- Pour carrier oil over the herbs until they’re completely submerged with at least an inch of oil above them. Any exposed plant material can develop mold.
- Seal the jar and place it in a warm spot with indirect sunlight, like a sunny windowsill. Direct, intense sun can overheat the oil and degrade it.
- Infuse for 4 to 6 weeks, shaking the jar gently every day or two to redistribute the plant material.
- Strain through cheesecloth or a fine mesh strainer into a clean, dry container. Squeeze the cloth to extract as much oil as possible.
The long infusion time allows the oil to slowly pull out fat-soluble compounds like plant pigments, antioxidants, and aromatic molecules without applying heat that might damage them.
The Heat Infusion Method
If you don’t want to wait a month, gentle heat speeds up the process considerably. A traditional approach involves warming the oil and plant material together over low heat for about 1.5 hours, stirring slowly throughout. The key is keeping the temperature low enough that you don’t fry the herbs or break down the oil’s beneficial compounds.
- Double boiler method: Place your herbs and oil in a heat-safe jar or the top pot of a double boiler. Fill the bottom pot with a few inches of water and heat on the lowest stove setting. Maintain this gentle, indirect warmth for 2 to 4 hours, checking occasionally that the water hasn’t evaporated. The oil should be warm to the touch but never simmering or smoking.
- Slow cooker method: Combine herbs and oil in a jar, place the jar in a slow cooker filled partway with water, and set it on the lowest (“keep warm”) setting for 4 to 8 hours.
After heating, let the oil cool completely, then strain it just as you would with a cold infusion. Heat-infused oils tend to have a stronger color and aroma than cold-infused versions because the warmth extracts compounds more aggressively.
Steam Distillation for Essential Oils
If you want to produce a true essential oil, you’ll need a distillation setup. A basic home kit consists of a heat source, a boiling flask for water, a biomass flask to hold the plant material, a still head to direct the steam, a condenser cooled by running water, and a receiver to collect the output. All-glass kits designed for home use are available from lab supply retailers and typically cost between $50 and $200.
The process works by passing steam through packed plant material. The heat causes volatile aromatic compounds in the plants to evaporate along with the steam. That vapor then passes through the condenser, where cold water cools it back into liquid. The liquid that collects is a mixture of water (called hydrosol) and a thin layer of essential oil floating on top, which you can separate with a pipette or separating funnel.
Expect very small yields. You may need several pounds of fresh plant material to produce even a small bottle of essential oil, which is why commercially produced essential oils carry a significant price tag. The hydrosol itself is useful, though. It contains water-soluble plant compounds and makes a gentle facial toner or linen spray.
Preserving and Storing Your Oil
Light, heat, and air are the three enemies of homemade oils. A 2021 study on essential oils found that oils stored in amber glass retained their potency 40% longer than those kept in clear glass, because amber blocks the UV wavelengths that trigger oxidation. Store all finished oils in dark amber or cobalt blue glass bottles with tight-fitting caps.
To further extend shelf life, you can add a small amount of vitamin E (tocopherol) as a natural antioxidant. A moderate amount is around 0.5% of the total volume of oil, which works out to roughly 5 drops per 100 milliliters. For oils with higher spoilage risk, you can go up to 1 to 2%. Rosemary extract is another effective option at even lower concentrations, around 0.1 to 0.2% of the total formula. These additions slow oxidation but don’t replace proper storage.
Keep finished oils in a cool, dark place. Refrigeration is ideal for culinary infusions and any oil made with fresh ingredients. Most well-made infused oils using dried herbs and a stable carrier like olive or jojoba will last 6 to 12 months stored properly. If an oil smells sharp, musty, or “off” compared to when you made it, it has likely gone rancid and should be discarded.
Pressing Oil From Seeds and Nuts
A third route to homemade natural oil involves mechanically pressing seeds or nuts to extract their oil directly. Home oil press machines, usually electric screw presses, can handle peanuts, sesame seeds, sunflower seeds, flaxseeds, walnuts, and coconut. You feed raw or lightly roasted seeds into the hopper, and the machine crushes them under pressure, separating the oil from the solid meal.
Cold pressing (without added heat) preserves more nutrients and flavor but yields less oil per batch. Hot pressing, where the seeds are heated first, increases output but can degrade some heat-sensitive compounds. Either way, freshly pressed oil has a flavor and aroma that’s noticeably more vivid than store-bought versions. The pressed oil will contain fine sediment, so let it settle for a day or two, then carefully pour off the clear oil or filter it through cheesecloth. Store it the same way you would any infused oil: amber glass, cool and dark, sealed tightly.