Sunflower Seeds: Benefits, Nutrition, Uses & Side Effects

Dr. Josh Axe · Free quiz

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Sunflower seeds come from the broad, golden face of the sunflower, where they ripen packed side by side in striped shells. Crack one open and you'll find a small gray kernel with a mild, nutty taste, and a handful of those kernels carries two-thirds of a day's vitamin E. It's a nutrient most of us run short on: more than 90% of Americans don't get enough vitamin E from food to meet the estimated average requirement.4

Sunflower seeds and sunflower seed butter are on the list of foods to eat in my book with Jordan Rubin, The Biblio Diet.5 The book suggests eating nuts in the shell, since cracking each one slows you down,5 and that trick works just as well with unsalted sunflower seeds in the shell.

Sunflower seeds often get pulled into the seed oil debate, so it helps to keep the seed and the oil apart. A kernel arrives with its fat, its own vitamin E, fiber, protein and minerals.1 The refined oil is a different product, and it has its own section further down.

Did you know?

• Ancient DNA from sunflower remains at Eden's Bluff, Arkansas, some up to 3,100 years old, carries the same chloroplast and mitochondrial DNA sequences as the sunflowers farmers grow today.6

• Of the nuts and seeds people eat as snacks, sunflower kernels and pistachios carry the most plant sterols, 270 to 289 milligrams per 100 grams, with beta-sitosterol among the main ones.7

• In a study of 10 adults that tracked copper with a stable isotope, people absorbed 52% of the copper in sunflower seeds, close to the 54% they absorbed from a reference dose.8

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What are sunflower seeds?

You'll find sunflower seeds in several forms:

• In the shell. Usually roasted and often salted. You crack the shell with your teeth, eat the kernel and discard the shell.
• Kernels. The hulled seed, sold raw, dry-roasted or roasted in oil, and what the nutrition table below describes.
• Sprouted kernels. Soaked until they begin to sprout, then dried; sprouting has its own section below.
• Sunflower seed butter. Ground kernels, a popular stand-in for peanut butter.9
• Sunflower lecithin. A phospholipid-rich extract separated from sunflower oil and sold as a supplement. I count it a good soy-free source of phospholipids and choline, behind fatty fish, egg yolks, liver and fish roe.10
• Sunflower oil. Pressed or extracted from the seeds; the seeds vs. oil section below compares the two.

A short history of sunflower seeds

Sunflowers are a North American crop. Genetic studies trace today's domesticated sunflowers to eastern North America, even though 4,000-year-old domesticated sunflower remains have also turned up in Tabasco, Mexico.11 Native American varieties grown a century ago carried genetic diversity that modern breeding has since lost.6 The seeds have a place in folk medicine too, where they've been used for heart complaints, coughs, colds, whooping cough and infections of the throat and lungs.12

Sunflower seeds nutrition facts

Dried sunflower seed kernels, per 1 ounce (28.35 g), calculated from USDA FoodData Central FDC ID 170562; % Daily Value uses FDA reference values.12

An ounce is a generous handful, a little less than ¼ cup of kernels. Treat the selenium figure as an average, because plants take up selenium from the soil they grow in;13 USDA's newer analysis of raw kernels found 17.8 micrograms per 100 grams, about a third of the older figure in the table.14

Linoleic acid, an omega-6 fat and the focus of the seed oil debate, is the seed's main fat, at nearly half the total, and omega-3 barely registers. Balance that with omega-3 foods like wild salmon, sardines, walnuts or ground flaxseed. The seeds-and-oil section below explains why the whole seed's linoleic acid isn't a worry.

What are sunflower seeds good for?

How do sunflower seeds work in your body?

Sunflower seeds work mainly through the nutrients they concentrate, and vitamin E leads the list. Here's its path from the seed to your cells:

The seed's minerals each have defined jobs too:

• Copper builds connective tissue and moves iron. A copper enzyme cross-links collagen and elastin into strong, flexible connective tissue and bone, and other copper enzymes prepare iron to travel in your blood.20 See copper deficiency for the signs of running low.

• Selenium runs antioxidant and thyroid enzymes. Your body builds selenium into at least 25 selenoproteins, among them the glutathione peroxidases and the deiodinases that activate thyroid hormone.13

• Magnesium helps make energy. ATP, the energy molecule your cells run on, exists mainly bound to magnesium, and the enzyme that makes ATP needs magnesium too.21

Sunflower kernels also carry chlorogenic acids, which make up most of their phenolic compounds and show antioxidant activity in lab studies.1222 In a 12-week placebo-controlled trial of 100 Korean adults with obesity, a sunflower seed extract supplying 100 milligrams of chlorogenic acids a day reduced body fat by 0.9 kilograms, against 0.1 kilograms on placebo.51

Sunflower seed benefits, ranked by evidence

In order of evidence, sunflower seeds help most with closing the vitamin E gap, adding copper and selenium, supporting healthy blood fats, steadying blood sugar, adding magnesium and supporting your antioxidant defenses.

Are sunflower seeds good for cholesterol and blood sugar?

The clearest test of the whole seed comes from New Zealand. Researchers there fed 22 postmenopausal women with type 2 diabetes a fully supplied, personalized diet built on diabetes guidelines, with 30 grams of sunflower kernels, about an ounce, added each day for 3 weeks. The study was supported by a medical research foundation award and a California almond industry grant. Each woman also spent 3 weeks on a matching diet with 30 grams of almonds instead, in random order, with a 4-week break between; in each diet, the small amounts of cooking oil and spread were chosen to match the fats in the nut or seed.3

From the start to the end of the sunflower kernel diet:

• Total cholesterol fell 9%, from about 236 to 215 mg/dL
• LDL cholesterol fell 9.5%, from about 146 to 132 mg/dL
• Triglycerides fell 12%, from about 197 to 173 mg/dL
• ApoB, a measure of how many cholesterol-carrying particles you have, fell 10%
• Oxidized LDL fell 12%
• Fasting blood sugar fell 11%, and HbA1c went from 6.64% to 6.42%
• Fasting insulin fell 30%, and systolic blood pressure fell 5%3

HDL cholesterol dipped about 3 mg/dL on sunflower kernels and held steady on almonds, and blood vitamin E fell 4.4% on sunflower kernels while rising 3.4% on almonds. On most other measures the two diets did about as well as each other, with no significant difference for LDL, blood sugar, insulin or blood pressure, and triglycerides and ApoB fell further on sunflower kernels. With those differences in mind, the researchers suggested including both nuts and seeds in the diets of people with diabetes.3

Sunflower seeds can also soften the blood sugar rise from a starchy food. In a Greek study, 11 healthy adults each tried three kinds of crackers on separate days, every portion carrying 50 grams of carbohydrate: regular-flour crackers, crackers with 30% whole-wheat flour and crackers with 30% sunflower seed flour. The sunflower seed crackers had a glycemic index of 53, in the low range, against 77 for the whole-wheat crackers and 90 for the regular ones. Only the sunflower seed crackers lowered the after-meal blood sugar peak compared with regular crackers, though their edge over the whole-wheat crackers wasn't clear-cut.15 For more ideas, see these blood sugar-friendly snacks and the insulin resistance diet.

Those results fit the wider research on nuts and seeds. A 2023 review of 28 cohort studies with nearly 1.9 million people found a 19% lower risk of cardiovascular disease, and a 23% lower risk of dying from it, among the people eating the most nuts and seeds, and about 30 grams a day, roughly an ounce, was linked with benefits of a similar size.16 For more foods that help, see these cholesterol-lowering foods.

How much vitamin E is in sunflower seeds?

Average intake from food in the U.S. is about 11.5 milligrams a day for men and 9.5 for women, against a recommended 15.19 Per ounce, USDA lists 10.0 milligrams of vitamin E for sunflower kernels, 7.3 for almonds, 4.3 for hazelnuts, 2.6 for pine nuts, 1.6 for Brazil nuts and 0.6 for pumpkin seed kernels.12425262728

Vitamin E from food has a long track record in aging research. In an observational study in Chicago that followed 2,889 adults aged 65 to 102 for an average of 3.2 years, those with the highest vitamin E intake had 36% slower cognitive decline than those with the lowest, and vitamin E from foods alone was also linked with slower decline.29

Vitamin E is on my short list of nutrients for protecting your cell membranes, and fried fast food sits at the other end as the worst thing you can eat for them.30 Food comes first in my approach,31 and a handful of sunflower kernels puts real vitamin E on your plate before you ever need to think about a capsule. For more on what this vitamin does, see vitamin E benefits.

Sunflower seeds vs. sunflower oil: what's the difference?

An ounce of sunflower kernels gives you its fat together with fiber, protein, minerals and the seed's own plant compounds.112 Refined sunflower oil keeps the fat and its vitamin E,19 leaves the fiber, protein and minerals behind and goes through heavy industrial processing on the way. Here's how it's made:

Limit regular sunflower oil, most of all when it's deep-fried, reused or baked into ultra-processed food, because it's among the highest in polyunsaturated fat and so among the most likely to oxidize when heated.33 High-oleic sunflower oil holds up better to heat and makes an acceptable backup, though never a reason to displace extra virgin olive oil or avocado oil at the top of the list.33 Cook mostly with those fruit oils, go easy on heavily refined and deep-fried seed oils, and don't stress over a little seed oil in an otherwise real-food diet; one cracker made with sunflower oil won't hurt you.33

Linoleic acid eaten in whole foods like nuts and seeds isn't something to fear.33 Large studies back that up. When researchers pooled 30 cohort studies covering 68,659 people, higher blood and tissue levels of linoleic acid went with a 7% lower risk of cardiovascular disease and a 22% lower risk of cardiovascular death, comparing high levels with low.34 Balance matters: modern diets bring plenty of omega-6 and too little omega-3 to match it.33 Enjoy sunflower seeds as the whole food they are, and for the full picture, see how to balance omega-3, 6 and 9 fats and these healthy fats.

Are sunflower seeds good for women?

Yes. The one feeding study of the whole seed was done in postmenopausal women with type 2 diabetes, and its results are in the cholesterol and blood sugar section above.3

Sunflower seeds also have a place in seed cycling. In my Hormone Balance for Women protocol, a tablespoon each of sunflower and sesame seeds goes with days 15 to 28 of the cycle, after ground flax and pumpkin seeds in days 1 to 14.35

In pregnancy, sunflower seeds are an ordinary, nourishing food; an ounce adds 64 micrograms of folate along with its vitamin E.1

How many sunflower seeds should you eat a day?

In The Biblio Diet, a handful is the daily ceiling for nuts, since they're a rich food that some people find tough to digest,5 and that handful makes sense for seeds too. The feeding study used 30 grams a day, right in that range.3

Food amounts sit far below the upper limits. The adult upper limit for vitamin E, 1,000 milligrams a day, applies to supplements,19 and the upper limit for selenium from all sources is 400 micrograms a day, far above the 15 micrograms in an ounce of kernels.13 Your calories, your gut and the salt on the label set the practical ceiling, so eat your handful wherever it fits: on a lunch salad, stirred into yogurt or as an afternoon snack.

Should you eat sunflower seeds raw, roasted or sprouted?

Sprouting earns its place on that list. Like grains and beans, raw seeds carry phytic acid, one of the antinutrients that bind minerals in your gut, and as Dr. Will Cole and I explain in Heal Your Cells, sprouting and fermenting lower phytic acid so your body can absorb more iron, zinc, calcium and magnesium.36 Lab studies of sunflower seeds show what sprouting adds: as the seeds germinated, their vitamin E, plant sterols, amino acids and GABA, a calming brain messenger, all rose,37 and sunflower sprouts were among the richest in phenolic antioxidants of the sprouts tested.22

Soaking is the simple home version. Like other nuts and seeds, kernels become more digestible when you soak them in water and then dry them in a low oven or a food dehydrator.5 If seeds bother your gut, I'd have you choose them sprouted and made into a seed butter, and with a very sensitive gut, wait on seeds for a while as it heals.38

Roasting is fine too. USDA's record for dry-roasted kernels lists 7.4 milligrams of vitamin E per ounce, so roasted seeds remain a strong source.39 The bigger difference is salt: an ounce of salted dry-roasted kernels carries 186 milligrams of sodium, against about 3 milligrams in unsalted dried kernels.401

How to eat, buy and store sunflower seeds

For a treat, my book Ancient Remedies has a recipe for homemade chocolate cups filled with sunflower seed butter, made with dark chocolate (70 to 85% cacao) and Medjool dates.41

Buy raw, dry-roasted or sprouted kernels with a short label, sunflower seeds and perhaps salt, and choose organic when you can find it.5 Pick a sunflower seed butter made from seeds with little or nothing added. Store kernels in an airtight jar in the refrigerator or freezer. Heat, light and time turn their delicate fats rancid, and seeds that taste bitter or smell stale belong in the trash.

Sunflower seeds vs. pumpkin seeds and other seeds

Ounce for ounce, sunflower seeds lead this group on vitamin E by a wide margin and sit near the top for copper and selenium, while pumpkin and hemp seeds lead on magnesium and zinc, and chia and flax bring the most fiber.

Amounts per ounce (28 g), from USDA FoodData Central SR Legacy records.1242842434445

Split your daily handful between sunflower and pumpkin seeds, and one snack brings vitamin E from the first and magnesium and zinc from the second. Our list of the healthiest seeds to eat covers the rest.

What are the side effects of sunflower seeds?

Interaction check: Low. Sunflower seeds in food amounts have no documented medication interactions. The vitamin E caution for people on blood thinners concerns high-dose supplements.19

Sunflower seed allergy

Sunflower seed allergy is uncommon, and it's being diagnosed more often in children. At a Boston pediatric allergy clinic, the yearly incidence of sunflower seed allergy went from zero in the late 1990s to 0.38% in 2021; half of the children's reactions were mild hives or rash, and a quarter were anaphylaxis.9 At a New York pediatric referral center, of 72 supervised sunflower seed challenges, 60 passed without a reaction, 10 brought a reaction (4 of them treated with epinephrine) and 2 were unclear. All but one of the 230 children the center had told to avoid sunflower seed had another food allergy as well, usually to tree nuts, sesame or peanut, and 77% had been told to avoid it because of a test result rather than a reaction.46

Already allergic to other seeds or nuts? Don't assume sunflower seeds or sunflower seed butter are safe for you, and don't test yourself at home; an allergist can confirm it with a supervised challenge. If hives, swelling, wheezing or trouble breathing follow, stop and call for emergency care.

Shells and children

Eat the kernel and leave the shell. In a review of 59 children treated for fecal impaction, 53 had rectal seed bezoars, hard masses of swallowed seeds, and 3 of those were from sunflower seeds; most of the children needed the blockage cleared under general anesthesia.47 If your children eat seeds in the shell, make sure they spit the shells out.

Cadmium

Sunflowers draw cadmium, a heavy metal, up from the soil, and some of it ends up in the kernel. In a French field study on soil with moderately high cadmium, seeds from three sunflower varieties carried 0.76 to 0.88 milligrams per kilogram, above the European limit of 0.5 for food, with 78% to 87% of it in the kernel.48 In a North Dakota study of 66 adults, the 17 who ate more than an ounce of kernels a week, 5 of them men eating more than an ounce a day, took in more cadmium from food, yet the cadmium in their blood and urine didn't differ from that of lighter eaters, and two urine markers of kidney stress didn't differ once corrected for urine concentration.49 Keep to your handful a day. For more on the topic, see heavy metal detox.

Acne-prone skin

If you're prone to acne, watch how your skin responds. In a small trial in Iran, 50 young people with acne were randomly assigned to eat 25 grams of packaged sunflower seed snacks a day for a week or to avoid them; acne severity scores rose more in the sunflower group, from 62 to 86.8 over two weeks, while a second acne grading score didn't differ between the groups.50

Kidneys, salt and digestion

An ounce of kernels carries 187 milligrams of phosphorus and 183 milligrams of potassium.1 If you have kidney disease or a phosphorus or potassium limit, fit them within the targets your care team has given you. Salted seeds add sodium quickly (the numbers are in the raw, roasted or sprouted section), so choose unsalted for everyday eating. If a handful leaves you bloated or gassy, start with a smaller amount, chew thoroughly and drink plenty of water, or switch to sprouted seed butter.

The bottom line

Sunflower seeds: frequently asked questions

References

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48. Nguyen C, Loison JP, Motard C, Dauguet S. Cadmium partitioning between hulls and kernels in three sunflower varieties: consequences for food/feed chain safety. Environ Sci Pollut Res Int. 2024;31(1):1674-1680. doi:10.1007/s11356-023-31631-0. PMID:38147238
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Dr. Josh Axe, DC, DNM, CNS

Doctor of Natural Medicine · Founder, DrAxe.com

Dr. Axe is a certified doctor of natural medicine, clinical nutritionist, and multiple New York Times bestselling author. He has spent 20+ years in clinical practice helping people heal at the root cause and founded one of the most-visited natural-health platforms in the world.

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This article is for educational purposes. See our medical disclaimer.