Hemp seeds are the small, edible seeds of the Cannabis sativa plant, specifically from varieties bred for industrial use rather than psychoactive effects. They contain less than 0.3% THC by dry weight, so they won’t produce any high. What makes them notable is their nutritional density: a single tablespoon packs 3 grams of protein and 4 grams of fat in just 57 calories, with a fatty acid profile that’s hard to find elsewhere in the plant world.
Hemp vs. Marijuana: The Same Plant, Different Strains
Hemp and marijuana both belong to the Cannabis sativa species, but they’re distinct strains with different chemical profiles. Hemp is bred to have very low concentrations of THC, the compound responsible for marijuana’s psychoactive effects. Under U.S. federal law (the 2018 Agriculture Improvement Act), hemp must contain no more than 0.3% THC on a dry weight basis to be sold legally. The seeds themselves contain even less THC than the rest of the plant, making hemp seed products among the least psychoactive cannabis-derived foods you can buy.
Whole Seeds vs. Hemp Hearts
You’ll find hemp seeds sold in two main forms: whole (with the outer shell intact) and hulled, which are marketed as “hemp hearts.” The difference matters more than you might expect.
Whole hemp seeds retain their crunchy outer hull, which is where most of the fiber lives. Research comparing hulled and dehulled hemp products found that the fiber content drops dramatically once the shell is removed, from roughly 37–41% in whole seed products down to about 7–8% in dehulled versions. Hemp hearts, on the other hand, have a soft, slightly creamy texture and a mild, nutty flavor that blends easily into smoothies, yogurt, or salads. If you’re adding hemp seeds primarily for protein and healthy fats, hemp hearts are the more versatile choice. If fiber is your goal, go with whole seeds.
A Complete Protein Source
Hemp seeds contain all nine essential amino acids, the ones your body can’t produce on its own. That puts them in a small club of plant foods considered complete proteins, alongside quinoa and soy. The protein in hemp seeds is made up primarily of a storage protein called edestin, which accounts for 60–80% of total seed protein, with smaller contributions from albumin (about 13%) and a third protein type (around 5%).
For people eating plant-based diets, this completeness is a real advantage. Many plant proteins are low in one or two essential amino acids, typically lysine or methionine, which means you need to combine different foods to get the full set. Hemp seeds simplify that. Three tablespoons gives you roughly 9 grams of protein, making them an easy addition to meals when you’re trying to hit your daily target.
The Fat Profile That Sets Them Apart
Over 70% of the fat in hemp seeds is polyunsaturated, and the ratio of omega-6 to omega-3 fatty acids sits at approximately 3:1. That ratio aligns with European Food Safety Agency recommendations and is considered favorable for reducing chronic inflammation. Most Western diets skew heavily toward omega-6 (often 15:1 or higher), so hemp seeds offer a corrective balance rather than adding to the problem.
Hemp seeds also contain two fatty acids that are uncommon in everyday foods: gamma-linolenic acid (GLA) and stearidonic acid. GLA is an omega-6 fat that, somewhat counterintuitively, has anti-inflammatory properties. Your body normally has to convert it from other fats in a slow, inefficient process. Getting it directly from food skips that bottleneck. The presence of GLA is one reason hemp seed oil has drawn interest for skin conditions, which is covered below.
Cardiovascular Benefits
Hemp seeds are notably rich in the amino acid arginine, which makes up about 2.3–3.1% of the whole seed by weight. Arginine serves as the raw material your body uses to produce nitric oxide, a molecule that relaxes and widens blood vessels. This process can improve blood flow, lower blood pressure, and reduce strain on the cardiovascular system over time. Glutamic acid is actually the most abundant amino acid in hemp seeds, but arginine’s role in vascular health is what gives these seeds their heart-health reputation.
The combination of arginine with a favorable omega-6 to omega-3 ratio and low saturated fat content makes hemp seeds a genuinely useful food for people focused on cardiovascular health, not just a trendy superfood label.
Effects on Skin Health
A clinical study on patients with atopic dermatitis (eczema) found that consuming hemp seed oil improved both skin dryness and itchiness significantly. Participants also reduced their use of dermal medications during the hemp seed oil period. Blood tests showed that levels of essential fatty acids, including GLA, increased across multiple lipid fractions after supplementation, while levels of arachidonic acid (a pro-inflammatory fat) did not rise.
The researchers attributed the skin improvements to the balanced and abundant supply of polyunsaturated fats in hemp seed oil. This doesn’t mean hemp seeds are a treatment for eczema, but for people with dry or inflammation-prone skin, regularly including them in your diet may offer a measurable benefit from the inside out.
How to Use and Store Them
Hemp hearts are the most beginner-friendly form. Sprinkle them on oatmeal, blend them into smoothies, toss them into salads, or stir them into pesto. Their mild, slightly nutty taste doesn’t overpower other flavors. Whole hemp seeds work well in granola, bread dough, or anywhere you want extra crunch and fiber.
Because hemp seeds are so high in polyunsaturated fats, they’re more prone to going rancid than nuts or grains with higher saturated fat content. Store them in an airtight container in the refrigerator or freezer to preserve freshness. At room temperature in an open bag, the oils can oxidize within weeks, developing an off taste and losing nutritional value. Kept cold in a sealed container, they’ll stay fresh for several months.
One tablespoon has about 57 calories, so portions add up quickly if you’re watching your intake. Two to three tablespoons per day is a common serving size that delivers meaningful amounts of protein, omega-3s, and minerals without excessive calories.