Safflower oil comes from the seeds of the safflower plant (Carthamus tinctorius), a thistle-like crop grown primarily in dry climates. Each seed contains between 23% and 37% oil by weight, and getting that oil out involves either mechanical pressing, chemical solvent extraction, or a combination of both. The process from raw seed to bottled oil follows a consistent sequence: cleaning, dehulling, extraction, and then refining for commercial use.
Seed Preparation
Before any oil can be extracted, safflower seeds go through several preparation steps. First, the seeds are cleaned to remove dirt, stones, plant debris, and other impurities picked up during harvest. Industrial facilities use destoners and grading machines to sort seeds by size and remove foreign material.
Next comes dehulling. Safflower seeds have a tough outer shell that contains very little oil, so separating the hull from the inner kernel improves oil yield and quality. Automated dehulling equipment cracks the shells, then uses air aspiration (essentially a controlled blast of air) to blow the lightweight hulls away from the heavier kernels. A separator then sorts the clean kernels from any remaining shell fragments or fine chips. Once the kernels are isolated, they’re ground or flaked to break open the cell walls, which makes the oil easier to extract.
Mechanical Pressing
The simplest extraction method is mechanical pressing, which uses physical force to squeeze oil out of the prepared seeds. The two main types of presses are screw presses and hydraulic presses, with screw presses being the most common in commercial production.
A screw press works by feeding cleaned safflower seeds into a hopper at one end. Inside, a cone-shaped pressing screw rotates and pushes the seeds through a gradually narrowing channel. As the space gets tighter, pressure builds and oil is forced out through small openings in the surrounding cylinder (called a zeer cylinder), dripping into a collection tank below. The remaining solid material, now mostly depleted of oil, exits the other end as a compressed cake.
Temperature matters here. Cold-pressed safflower oil is produced at lower temperatures to preserve heat-sensitive nutrients and flavor compounds, particularly the oil’s naturally high vitamin E content. Industrial screw presses can operate anywhere from 30°C to 180°C depending on the desired product. Lower temperatures yield less oil but produce a higher-quality product that retains more of the seed’s natural antioxidants and flavor. Higher temperatures increase oil output but can degrade some beneficial compounds. “Cold pressed” on a label generally means the oil never exceeded about 49°C (120°F) during extraction.
Solvent Extraction
Mechanical pressing doesn’t get all the oil out. To maximize yield, many large-scale producers use solvent extraction, either on its own or as a second pass on the leftover press cake.
The process is straightforward in principle. The crushed or pre-pressed seed material is mixed with a chemical solvent, most commonly n-hexane, which dissolves the oil. The EPA classifies safflower as one of eight oilseed types processed this way in the United States, alongside soybean, sunflower, and others. After the oil dissolves into the solvent, the liquid mixture is separated from the spent seed solids. The solution is then heated to evaporate the hexane, which boils off at a relatively low temperature. The evaporated solvent is condensed and recycled back into the process, while the now solvent-free oil moves on to refining.
Solvent extraction pulls out significantly more oil than pressing alone, which is why it dominates industrial production. The tradeoff is that the resulting oil always requires further refining to remove any trace solvent residue and to meet food-grade standards.
Refining the Crude Oil
Whether the oil was pressed or solvent-extracted, the crude product contains impurities that affect its taste, appearance, shelf life, and cooking performance. Commercial safflower oil typically goes through four refining stages.
Degumming
The first step removes phospholipids, trace metals, and other gummy materials that would otherwise make the oil cloudy and unstable. Water or a mild acid solution is mixed with the crude oil, causing these compounds to clump together so they can be separated out by centrifuge.
Neutralization
Free fatty acids in the oil contribute off-flavors and accelerate spoilage. In chemical refining, a sodium hydroxide solution is mixed with the degummed oil. The sodium hydroxide reacts with the free fatty acids to form soap, which is then washed away with water. Some producers skip this step and use physical refining instead, which removes free fatty acids later during deodorization through steam distillation.
Bleaching
Despite the name, bleaching doesn’t involve bleach. The oil is passed through an absorbent clay or activated carbon, which pulls out pigments (the yellow and green compounds from chlorophyll and carotenoids), residual soaps, metals, and oxidation byproducts. This step gives the oil its pale, neutral color.
Deodorization
The final stage uses high-temperature steam distillation under vacuum to strip out volatile compounds that cause unwanted odors and flavors, along with any remaining free fatty acids and oxidation products. The result is a clean, neutral-tasting oil with a long shelf life. This is the safflower oil you find in clear bottles at the grocery store.
Unrefined or “virgin” safflower oil skips most or all of these steps, retaining more of the seed’s natural color, flavor, and nutrients. It has a lower smoke point and shorter shelf life, but some consumers prefer it for dressings and low-heat cooking.
High-Oleic vs. High-Linoleic Varieties
Not all safflower oil is the same, and the difference starts in the field, not the factory. There are two main types of safflower, bred to produce oils with very different fatty acid profiles.
The traditional variety is high-linoleic safflower oil, where linoleic acid (a polyunsaturated omega-6 fat) makes up 55% to 77% of the total fat content, with an average around 71%. This type is commonly used in salad dressings and foods where a neutral flavor matters. The second type comes from a mutant safflower variety bred to be high in oleic acid, a monounsaturated fat. High-oleic safflower oil is more heat-stable, giving it a higher smoke point and making it better suited for frying and high-temperature cooking.
The extraction and refining process is essentially identical for both types. The difference is entirely in the seed genetics. When you see “high-oleic safflower oil” on a food label, it means the manufacturer chose a specific cultivar, not a different production method.
What Happens to the Leftover Seed Meal
Oil extraction produces a substantial amount of solid byproduct. Once the oil is removed, the remaining seed meal contains roughly 50% to 54% protein, classifying it as a high-protein agricultural byproduct. Researchers have identified at least 17 amino acids in safflower seed meal protein.
Most of this meal currently ends up as livestock feed or is simply discarded as agricultural waste. That represents a significant loss of edible protein. There’s growing interest in using safflower seed meal as a plant-based protein ingredient for human food, though this hasn’t yet become widespread in commercial production.