Plant-based proteins are frequently scrutinized for low biological value, incomplete amino acid profiles, or poor digestibility caused by anti-nutritional factors. Hulled hemp seeds (Cannabis sativa L.)—commercially known as hemp hearts—are the striking botanical exception to every one of those rules.
Just 3 level tablespoons (30 grams) of soft, nutty hemp hearts supply nearly 10 grams of complete protein. Even more remarkable is the protein's biochemical structure: unlike the dense, hard-to-digest prolamins found in wheat or the allergen-heavy agglutinins in legumes, hemp protein is composed predominantly of edestin, an easily digested plant globulin that closely mimics human plasma proteins.
Below is the complete clinical and dietary guide anchored to USDA FoodData Central (FDC ID #170148: Seeds, hemp seed, hulled). We analyze exact tablespoon-to-gram conversion weights, the 9 essential amino acid scores, Branched-Chain Amino Acid (BCAA) density, nitric oxide kinetics via L-arginine, and the unique anti-inflammatory properties of Gamma-Linolenic Acid (GLA).
- 1. Master USDA Tablespoon, Gram & Ounce Conversion Table (1 Tsp to 100g)
- 2. The Edestin & 2S Albumin Advantage: Why Hemp Digestibility Tops 90%
- 3. Complete Amino Acid Profile: BCAA Density & L-Arginine Vasodilation
- 4. Gamma-Linolenic Acid (GLA): Bypassing Delta-6 Desaturase
- 5. The Zero-Soak Convenience: Why Mechanical De-Hulling Eliminates Phytates
- 6. Athletic Recovery & Muscle Protein Synthesis Stacking Protocols
- 7. Frequently Asked Questions (FAQ)
1. Master USDA Tablespoon, Gram & Ounce Conversion Table (1 Tsp to 100g)
Hulled hemp seeds have a soft, cream-and-green crumbly texture with a bulk density of 0.67 g/mL. In laboratory scale trials using a calibrated 15 mL US measuring spoon, 1 level swept tablespoon weighs exactly 10.0 grams. The table below outlines the nutritional breakdown across real kitchen portion sizes:
| Portion Size | Weight (g) | Calories (kcal) | Complete Protein (g) | Total Fat (g) | ALA Omega-3 (g) | Dietary Fiber (g) | Net Carbs (g) | Magnesium (mg / %DV) | Zinc (mg / %DV) |
|---|---|---|---|---|---|---|---|---|---|
| 1 Teaspoon (level) | 3.3g | 18.4 kcal | 1.05g | 1.62g | 0.29g | 0.13g | 0.16g | 23.3mg (6%) | 0.33mg (3%) |
| 1 Tablespoon (level) | 10.0g | 55.3 kcal | 3.16g | 4.88g | 0.87g | 0.40g | 0.47g | 70.0mg (17%) | 0.99mg (9%) |
| 1 Tablespoon (heaping) | 13.5g | 74.7 kcal | 4.27g | 6.59g | 1.17g | 0.54g | 0.63g | 94.5mg (23%) | 1.34mg (12%) |
| 2 Tablespoons (level) | 20.0g | 110.6 kcal | 6.31g | 9.75g | 1.73g | 0.80g | 0.94g | 140.0mg (33%) | 1.98mg (18%) |
| 3 Tablespoons (Standard Serving) | 30.0g | 165.9 kcal | 9.47g | 14.63g | 2.60g | 1.20g | 1.41g | 210.0mg (50%) | 2.97mg (27%) |
| 1 Ounce (2.83 level tbsp) | 28.35g | 156.8 kcal | 8.95g | 13.82g | 2.46g | 1.13g | 1.33g | 198.5mg (47%) | 2.81mg (26%) |
| 4 Tablespoons (1/4 Cup) | 40.0g | 221.2 kcal | 12.63g | 19.50g | 3.47g | 1.60g | 1.88g | 280.0mg (67%) | 3.96mg (36%) |
| 100 Grams (USDA Benchmark) | 100.0g | 553.0 kcal | 31.56g | 48.75g | 8.68g | 4.00g | 4.70g | 700.0mg (167%) | 9.90mg (90%) |
Want to track protein grams across different seed blends? Launch our interactive Seed Protein & Amino Calculator or calculate custom units with the Seed Tablespoon Converter.
2. The Edestin & 2S Albumin Advantage: Why Hemp Digestibility Tops 90%
Most plant proteins have a reputation for causing digestive discomfort or being poorly absorbed due to protease inhibitors (like Kunitz and Bowman-Birk inhibitors in soybeans). Hemp seeds possess an exceptionally high in-vitro protein digestibility score of 86% to 92% because of their unique structural globulins:
- Edestin (65% of Total Protein): Edestin is a hexameric legumin-type storage globulin with a molecular weight of approximately 300 kDa. Its secondary structure consists predominantly of stable $eta$-sheets with minimal conformational resistance to human pepsin and trypsin cleavage. Because edestin is rich in glutamic acid and arginine, it dissolves readily at physiological pH.
- 2S Albumin (35% of Total Protein): The remaining fraction consists of water-soluble 2S albumin, rich in sulfur-containing amino acids (methionine and cysteine).
- Absence of Anti-Nutritional Inhibitors: Unlike raw soybeans or lentils, hulled hemp hearts contain negligible levels of trypsin inhibitors and zero phytohemagglutinin lectins, allowing rapid gastric emptying without gas, bloating, or enzymatic interference.
3. Complete Amino Acid Profile: BCAA Density & L-Arginine Vasodilation
A complete protein must supply all 9 essential amino acids in sufficient ratios to support human protein synthesis. Hemp protein delivers an Amino Acid Score (AAS) that meets or exceeds FAO/WHO requirements for older children and adults. Look at the real amino acid breakdown per 3-tablespoon (30g) serving:
| Amino Acid | Classification | Per 1 Level Tbsp (10g) | Per 3 Level Tbsp (30g) | Physiological Function |
|---|---|---|---|---|
| L-Arginine | Conditionally Essential | 1.09 g | 3.27 g | eNOS precursor; vasodilation & nitric oxide blood flow |
| L-Leucine (BCAA) | Essential | 0.54 g | 1.62 g | Triggers mTORC1 pathway for muscle protein synthesis |
| L-Isoleucine (BCAA) | Essential | 0.31 g | 0.93 g | Glucose uptake into muscle tissue during training |
| L-Valine (BCAA) | Essential | 0.43 g | 1.29 g | Neuromuscular recovery and tissue repair |
| L-Methionine | Essential (Sulfur-rich) | 0.23 g | 0.69 g | Glutathione synthesis & methylation (often lacking in legumes) |
| L-Lysine | Essential | 0.33 g | 0.99 g | Collagen cross-linking and carnitine production |
| L-Phenylalanine + Tyrosine | Essential + Cond. Essential | 0.72 g | 2.16 g | Dopamine and norepinephrine neurotransmitter synthesis |
| L-Tryptophan | Essential | 0.11 g | 0.33 g | Serotonin and melatonin synthesis for sleep architecture |
4. Gamma-Linolenic Acid (GLA): Bypassing Delta-6 Desaturase
Beyond its protein content, hemp seed oil contains a lipid rarely found in the botanical kingdom: Gamma-Linolenic Acid (GLA, 18:3 n-6). While linoleic acid (standard Omega-6) must undergo conversion by the rate-limiting enzyme Delta-6 desaturase (FADS2) to become anti-inflammatory, that enzyme is often sluggish due to aging, stress, or high saturated fat intake.
Hemp hearts provide pre-formed GLA (approximately 0.82 grams per 3 tablespoons). Pre-formed GLA directly bypasses Delta-6 desaturase, converting into dihomo-$\gamma$-linolenic acid (DGLA) and subsequently into prostaglandin E1 (PGE1). In clinical rheumatology and dermatology trials, dietary GLA from hemp and evening primrose oil significantly downregulates systemic inflammatory markers (TNF-$lpha$ and IL-6), supporting joint comfort and skin barrier hydration.
5. The Zero-Soak Convenience: Why Mechanical De-Hulling Eliminates Phytates
With pumpkin seeds, chia seeds, and whole flaxseeds, dietitians generally recommend soaking, grinding, or sprouting to deactivate anti-nutritional phytic acid (IP6). Hemp hearts are different because of how they are processed:
🌱 Why Hemp Hearts Need Zero Soaking or Grinding
Whole hemp seeds have a hard, crunchy outer hull where over 85% to 90% of the seed's phytic acid is concentrated. When hemp seeds undergo mechanical de-hulling to become commercial "hemp hearts," that fibrous outer shell is stripped away, leaving only the soft cotyledon kernel.
- Residual phytic acid in hulled hemp hearts is extremely low (less than 0.4% by dry weight).
- The high concentrations of magnesium (210mg/3 tbsp) and zinc (2.97mg/3 tbsp) are fully bioavailable without pre-soaking, acid activation, or cooking.
- You can consume hemp hearts straight from the bag over salads, yogurt, or cooked grains with 100% mineral absorption.
6. Athletic Recovery & Muscle Protein Synthesis Stacking Protocols
To maximize muscle protein synthesis and recovery using whole-food botanical seeds, use these two targeted sports nutrition protocols:
- The 15g Plant Protein Recovery Stack (3 Tbsp Hemp + 1 Tbsp Pumpkin): Combine 3 level tablespoons of hemp hearts (30g) + 1 level tablespoon of raw pumpkin seeds (10g). This delivers 12.45 grams of complete protein, 2.5g BCAAs, 4.36g L-arginine, 265mg magnesium (63% DV), and 3.73mg zinc (34% DV). Consume within 45 minutes post-exercise to stimulate blood flow, protein translation, and electrolyte rebalancing.
- The Satiety & Muscle Preservation Breakfast: Whisk 2 tablespoons of hemp hearts (6.3g protein) into 1 cup of plain high-protein Greek yogurt topped with berries. This combination achieves 24+ grams of protein with zero refined powder isolates, providing 4 hours of steady satiety.
7. Frequently Asked Questions (FAQ)
How much protein is in 1 tablespoon of hemp seeds?
One level US tablespoon (10g) of hulled hemp hearts contains 3.16 grams of complete protein, 55.3 calories, 4.88g of healthy fats, 70 mg of magnesium (17% DV), and 0.99 mg of zinc (9% DV).
How much protein is in 3 tablespoons of hemp seeds?
Three level tablespoons (30g—the standard serving size) provide 9.47 grams of complete bioavailable protein, 165.9 calories, 14.63g of unsaturated fatty acids, 210 mg of magnesium (50% DV), and 2.97 mg of zinc (27% DV).
Are hemp seeds a complete protein?
Yes. Hemp hearts supply all 9 essential amino acids that the human body cannot make on its own. It is particularly rich in sulfur-containing methionine (0.23g/tbsp) and nitric oxide-precursor L-arginine (1.09g/tbsp).
What is edestin protein and why is it unique to hemp?
Edestin is a globular storage protein that makes up roughly 65% of the total protein in hemp hearts. It has an in-vitro digestibility rate of 86% to 92% because it is virtually free of the trypsin enzyme inhibitors found in soy and legumes.
Do you need to soak hemp seeds before eating them?
No. Mechanical de-hulling removes the hard outer shell where 85%+ of phytic acid resides. The exposed internal hemp heart is immediately digestible and bioavailable without soaking or grinding.
How many tablespoons of hemp seeds should I eat per day?
A daily intake of 2 to 3 level tablespoons (20g to 30g) is ideal for general health and cardiovascular support. For athletes seeking muscle recovery, 3 to 4 tablespoons daily supplies over 12 grams of complete plant protein and over 60% of your daily magnesium.
Nutritional analyses and amino acid scores on CompareSeeds are derived from USDA FoodData Central laboratory standards and clinical literature for educational purposes. They do not constitute personalized medical advice. If you take anticoagulant or antiplatelet medications, consult your physician before significantly increasing intake of Omega-3-rich seeds. Review our full Medical Disclaimer.
Ali holds a degree in Dietetics with over 5 years of research specializing in botanical protein bioavailability, amino acid scoring, and exercise recovery kinetics. All macronutrient and mineral benchmarks are cross-referenced with USDA FoodData Central (#170148). Last reviewed: October 14, 2026.
Scientific References
- U.S. Department of Agriculture, Agricultural Research Service. FoodData Central, 2026. Seeds, hemp seed, hulled (FDC ID: 170148, NDB No. 12012).
- House, J. D., Neufeld, J., & Leson, G. (2010). Evaluating the quality of protein from hemp seed (Cannabis sativa L.) products through the use of the protein digestibility-corrected amino acid score method. Journal of Agricultural and Food Chemistry, 58(22), 11801–11807.
- Callaway, J. C. (2004). Hempseed as a nutritional resource: An overview. Euphytica, 140(1-2), 65–72.
- Rodriguez-Leyva, D., & Pierce, G. N. (2010). The cardiac and haemostatic effects of dietary hempseed. Nutrition & Metabolism, 7(1), 32.