Sunflower Seed Nutrition: Immune Support, Weight Management, and Minerals

Per 28 g, dried sunflower kernels provide about 164 kcal, 5.8 g of protein and 9.8 mg of vitamin E, 66% of the Daily Value, plus magnesium, selenium and fiber (USDA FoodData Central, scaled to 28 g). These are food-composition figures, not health claims, and this guide explains what each nutrient does.

What Nutrients in Sunflower Seeds Support the Immune System?

• •Vitamin E, a powerful antioxidant that helps protect cells from free-radical damage. Sunflower seed kernels are one of the richest natural sources of vitamin E, providing about 234% of the Daily Value per 100g according to USDA FoodData Central
• •Zinc, 5 mg per 100 g in the USDA record
• •Selenium, 53 mcg per 100 g in the USDA record
• •Fat, 51 g per 100 g in the USDA record, mostly polyunsaturated and monounsaturated
• •Protein, supplies amino acids needed for antibody production
• •Fiber, 8.6 g per 100 g in the USDA record
• •Antioxidants, flavonoids and phenolic acids help protect cells from oxidative stress

How many seeds would it take to notice an effect?

There's no single seed count that triggers an immune benefit, nutrient intake works cumulatively over a regular diet, not from a single serving. A daily handful (about 28g, or a small palmful of shelled kernels) is a reasonable, sustainable way to work these nutrients into a diet consistently, rather than treating any one serving as a targeted dose.

What Is the Nutritional Profile of Sunflower Seeds (per 100g)?

Sunflower seeds are calorie-dense, which can sound like the opposite of what a weight-conscious diet needs, but the combination of protein, fiber, and healthy fats they provide plays a real role in appetite regulation when portioned sensibly. Figures below are for raw, dried kernels per USDA FoodData Central; the 30g column is roughly a 3 tablespoon serving, and %DV uses the FDA adult Daily Value:

How Do These Nutrients Support Weight Management?

Protein increases fullness, supports metabolism, and helps preserve muscle mass during weight loss, this isn't unique to sunflower seeds, but a well-established mechanism in nutrition research. A clinical review of high-protein diets reports that they raise levels of appetite-suppressing gut hormones, increasing satiety signaling and reducing food intake.

What's a Practical Daily Habit for Adding Sunflower Seeds to a Diet?

About 30 g of kernels per day (roughly 3 tablespoons) is a reasonable portion for most people looking to add sunflower seeds to a weight-conscious diet, whether eaten on their own, over a salad, or blended into a smoothie.

Are sunflower seeds too high in calories for weight loss?

Calorie density and weight management aren't mutually exclusive, what matters is total daily intake and portion size, not any one food's calories per gram in isolation.

What Essential Minerals Do Sunflower Seeds Provide?

Vitamin E and protein tend to get most of the attention when sunflower seeds come up in a nutrition conversation, but the mineral profile is just as notable.

• •Phosphorus, works with calcium for bone and teeth strength, and supports kidney function
• •Zinc, supports immune function and wound healing
• •Iron, supports energy levels and oxygen transport
• •Selenium, an antioxidant that also supports thyroid function

How Do Sunflower Seeds Compare to Other Nuts and Seeds for Minerals?

Per 100g, USDA lists dried sunflower kernels as providing roughly 325mg magnesium, 660mg phosphorus, 5mg zinc, and 53μg selenium. A reasonable daily serving is about 1 ounce (28g), or roughly 3 tablespoons.

Does roasting reduce the mineral content of sunflower seeds?

Minerals are generally stable under heat, unlike some heat-sensitive vitamins, so roasting has minimal effect on magnesium, phosphorus, zinc, iron, or selenium content. Roasting temperature and time matter more for flavor and for the seed's fat quality than for its mineral profile.

Why Does Nutrient Density Matter for Snack Brand Buyers?

For snack brands and distributors, this full nutrient picture, not just vitamin E, can be a differentiator, within the rules for claims in your market. These are USDA reference values for dried kernels and not test results for any particular series.

What Does a 28 g Serving Provide, According to USDA?

Scaling the USDA record for dried sunflower kernels to 28 g gives about 164 kcal, 5.8 g of protein, 9.8 mg of vitamin E, 91 mg of magnesium and 15 mcg of selenium (USDA FoodData Central, calculated). Against the FDA Daily Values of 15 mg, 420 mg and 55 mcg, that is about 66%, 22% and 27% respectively.

These are reference values for dried kernels, not test results for a particular series, and they describe food composition rather than health outcomes. A claim on a pack has to follow the rules of the market where the product is sold.

What Are the Limits of This Guide?

The figures are USDA reference values for dried kernels, not test results for any series, and they describe food composition and not medical outcomes. People with a medical condition or a prescribed diet should follow their clinician's advice.

Where Do These Numbers Come From?

• •fdc.nal.usda.gov - cited for: USDA FoodData Central. Checked 2026-10-24.
• •fdc.nal.usda.gov - cited for: USDA FoodData Central. Checked 2026-10-24.
• •pmc.ncbi.nlm.nih.gov - cited for: clinical review of high-protein diets. Checked 2026-10-24.

Where Can You Source Sunflower Seeds for a Health or Wellness Brand?

For more on how to put this nutrition profile to work in a recipe, see our complete cooking guide. Sourcing seeds for a health, weight-management, or wellness-positioned brand? Request samples (the buyer pays shipping) for the series that best matches your product. Product details are on our products page, and the full buying process is in our bulk sunflower seeds buyer's guide.