📊 Full nutrition facts — per 100g
| Nutrient | Amount | % Daily value | Level |
|---|---|---|---|
| Calories | 584 kcal | 29% | |
| Carbohydrates | 20.0g | 7% | |
| Dietary fibre | 8.6g | 31% | |
| Sugars | 2.6g | — | |
| GI (Glycaemic Index) | ~35 — Low | — | |
| Protein | 20.8g | 42% | |
| Vitamin E | 35.2mg | 196% | |
| Selenium | 53µg | 76% | |
| Thiamine (B1) | 1.48mg | 99% | |
| Magnesium | 325mg | 81% | |
| Phosphorus | 660mg | 66% | |
| Folate | 227µg | 57% |
Based on Australian NRV. Source: FSANZ Australian Food Composition Database.
📈 Glycaemic index (GI)
💊 Key vitamins & minerals
✅ Health benefits
Sunflower seeds provide 35.2mg of vitamin E per 100g — nearly double the daily requirement — making them the richest seed source of this fat-soluble antioxidant. Vitamin E protects cell membranes from oxidative damage, supports immune function and has been associated with reduced cardiovascular disease risk. A 30g serving of sunflower seeds covers nearly 60% of daily vitamin E needs.
Sunflower seeds are rich in linoleic acid (omega-6 polyunsaturated fat) and plant sterols (phytosterols) that compete with dietary cholesterol for absorption, reducing LDL levels. Clinical trials show that replacing saturated fat with sunflower seed fat significantly reduces total and LDL cholesterol. The seeds also contain chlorogenic acid — an antioxidant with blood pressure-lowering properties.
Sunflower seeds provide 1.48mg of thiamine per 100g — nearly the complete daily requirement. Thiamine is essential for neural signal transmission, energy metabolism in brain cells and carbohydrate processing. Combined with their folate (57% RDI) and magnesium (81% RDI), sunflower seeds support comprehensive nervous system health.
At 325mg of magnesium per 100g, sunflower seeds are among the richest food sources of this mineral, essential for bone mineralisation, muscle contraction, blood pressure regulation and over 300 enzymatic reactions. Magnesium deficiency is common in Australia; sunflower seeds are one of the most practical and affordable food-based remedies.
⚠️ Who should limit or avoid
Sunflower seed allergy is uncommon but exists, with potential for anaphylaxis in sensitised individuals. Cross-reactivity with other Asteraceae family plants (ragweed pollen, chamomile, chrysanthemum) can cause oral allergy syndrome. Sunflower seed oil is generally tolerated even by sunflower seed-allergic individuals as the allergenic proteins are not present in refined oil.
At 584 kcal per 100g, sunflower seeds are calorie-dense. A 30g serve (3 tablespoons) provides approximately 175 calories. People monitoring calorie intake should measure portions. Salted commercial sunflower seeds can also be very high in sodium — choose unsalted or raw varieties.
Sunflower seeds accumulate cadmium (a heavy metal) from soil more than most plants. At typical serving sizes this is not a concern, but people consuming very large quantities daily (100g+) should vary their seed intake. This is an extremely rare concern at normal food amounts.
🛒 How to select & buy sunflower seeds
Hulled sunflower seeds (the grey-white kernels without the black-and-white striped shell) are most practical for eating and cooking — adding to salads, granola, trail mix and baking. In-shell sunflower seeds are a satisfying snack that slows eating pace naturally. Nutritionally identical — choose based on how you'll use them.
Raw hulled sunflower seeds retain all heat-sensitive nutrients including vitamin E. Lightly dry-roasted improves flavour significantly. The main concern with commercial roasted sunflower seeds is sodium — flavoured products can contain 500–800mg of sodium per 100g (one-third of daily sodium). Choose raw or unsalted roasted varieties and season at home.
The high polyunsaturated fat content of sunflower seeds means they go rancid faster than lower-fat seeds. Fresh sunflower seeds smell mild and slightly nutty. Rancid seeds smell sour, bitter or like old cooking oil. Buy from stores with high turnover and refrigerate after opening — especially hulled seeds which have no protective shell.
🧊 Storage tips & shelf life
Hulled sunflower seeds are relatively short-lived at room temperature due to high polyunsaturated fat. Move to fridge after opening, especially in warm Australian conditions. In-shell seeds keep longer due to the protective hull.
Best everyday storage for hulled seeds. Cold temperature prevents linoleic acid oxidation. Keep in an opaque container to prevent light-induced rancidity. Hulled seeds smell fresh for much longer when refrigerated.
Excellent long-term storage. Sunflower seeds freeze with no quality loss. Ideal for buying in bulk at better prices. Use directly from frozen in cooking — no thawing required for most applications.
📖 About sunflower seeds — complete guide
Sunflower seeds are nutritionally distinguished by two exceptional characteristics rarely found together in a single food: the highest vitamin E content of any seed (196% RDI per 100g) and among the highest thiamine (B1) content of any plant food (99% RDI per 100g). These two micronutrients address two of the most common nutritional deficiencies in Australian diets — vitamin E deficiency (associated with increased cardiovascular disease risk and cognitive decline) and thiamine deficiency (associated with neurological dysfunction, particularly relevant in people with high carbohydrate intake or alcohol consumption).
The story of the sunflower — Helianthus annuus — is one of botanical domestication in the American Southwest, where indigenous peoples cultivated it as a staple crop over 5,000 years ago, grinding the seeds into flour and using the oil for cooking and skin care. Today sunflower is the fourth largest oilseed crop globally. Australia grows sunflowers as a dual-purpose crop — for oil crushing and for birdseed/food-grade human consumption — primarily in the black soil plains of southern Queensland. The distinctive large-diameter flower head (botanically a composite of hundreds of tiny florets) can follow the sun during the day in young plants — a behaviour called heliotropism — though mature flower heads become fixed facing east.