Which Plant Protein Is Right for Your Products? Hemp and Rice Compared
Which Plant Protein Is Right for Your Products? Hemp and Rice Compared
Rice protein packs more protein per serving than hemp — about 70-90% protein versus 50-70% for hemp. But it is not a complete protein: rice is low in the essential amino acid lysine. Hemp is a complete protein, keeps its fibre and omega-3s, and is mechanically processed without chemicals. Rice wins on protein density and a neutral flavour. Hemp wins on nutrition breadth and clean processing. Neither is “better” — it depends on whether you need a concentrated protein or whole-food nutrition.
Rice and hemp are two of the most popular plant proteins in the EU, especially among people looking for hypoallergenic, vegan options. One is a refined isolate from brown rice, the other a mechanically milled seed flour. They look similar in a scoop, but the amino acid profiles, processing methods, and nutritional footprints could not be more different.
This comparison covers protein content, amino acids, digestibility, the heavy metal concern around rice protein, environmental impact, and who should choose which — using the real product data from Nordic Hemp’s hemp protein range.
What’s the difference between hemp and rice protein?
Hemp protein is made by mechanically milling hemp seeds — either the whole seed (50% protein) or the dehulled seed heart (70% protein). Rice protein is made from brown rice using enzyme processing to isolate the protein, typically reaching 70-90% protein concentration.
The big difference: hemp is a minimally processed whole-food ingredient that keeps fibre, healthy fats and minerals. Rice protein is a refined concentrate that gives more protein per gram but leaves most of its natural nutrients behind — and it is not a complete protein.
How do hemp and rice protein compare nutritionally?
Rice protein isolate contains roughly 70-90% protein by weight, while hemp protein ranges from 50% to 70% depending on the product. A 30 g serving of rice protein gives about 21-27 g of protein; the same serving of hemp gives about 15 g (HP50) or 21 g (HP70).
| Per 100 g | Hemp Protein 50% | Hemp Protein 70% | Rice Protein (typical) |
|---|---|---|---|
| Protein | 50 g | 70.2 g | 70-90 g |
| Energy | 325 kcal | 323 kcal | ~370-400 kcal |
| Fat | 13 g (omega-3/6) | 2 g | ~1 g |
| Fibre | 5.4 g | low | ~1 g |
| Sugars | 4.9 g | 3.6 g | ~0.5 g |
| Complete protein | Yes (lysine limiting) | Yes (lysine limiting) | No (low lysine) |
| Common allergen | No | No | No (hypoallergenic) |
| Processing | Mechanical, cold-pressed | Mechanical, patented | Enzyme extraction |
Hemp protein contains more fat and fibre because it is a whole-food product. Those extra grams are omega-3s and fibre — nutrients that rice protein does not provide.
Amino acid profiles: both fall short in similar ways
Hemp is a complete protein with all nine essential amino acids, though lysine is its limiting amino acid. Rice protein is not complete — it is noticeably low in lysine, the same amino acid that limits hemp. That matters because pea and soy have higher lysine levels, so they cover the gap better.
Rice protein is rich in methionine and cysteine, while hemp has a more balanced spread across the amino acid spectrum. Both are lower in leucine than whey or pea, so neither is great for pure muscle building on its own.
Because both are low in lysine, rice and hemp do not complement each other as well as rice and pea, or hemp and pea. You would need a third source — like pea or legume protein — to round out the amino acid profile.
Which one scores higher on protein quality?
Rice protein has a PDCAAS of roughly 0.5-0.7 depending on processing, limited by its low lysine content. Hemp typically scores around 0.63-0.66, which is similar. Neither scores as high as soy (1.0) or pea (0.89-1.0), but both are respectable plant options.
The gap only really matters if rice or hemp is your only protein source. In a varied diet — alongside legumes, grains or other proteins — the amino acid gaps are easily covered.
Does rice protein contain heavy metals?
This is a concern unique to rice. Rice plants absorb arsenic, cadmium and lead from soil and water more readily than most other crops. The FDA sets limits for rice protein products: total arsenic at ≤0.2 mg/kg, cadmium at ≤0.3 mg/kg, and lead at <0.25 mg/kg. Reputable manufacturers test for these, but it is worth knowing about.
Hemp does not have this issue. Hemp plants are not heavy metal accumulators the way rice is, and hemp protein is tested for purity from raw material to finished product. For manufacturers who want to avoid the heavy metal question entirely, hemp is a cleaner choice.
Which is better for muscle building — rice or hemp?
Rice protein has a slight edge for muscle building. It contains more protein per gram and its leucine content is comparable to hemp’s, though both are lower than pea or whey. A 2013 study found that rice protein supported body composition improvements similar to whey after resistance training.
Hemp protein still supports muscle, but you would need a larger serving to match the same protein dose. For athletes whose primary goal is muscle mass, rice protein works — but neither is ideal without complementing it with other protein sources.
Digestibility and allergens
Both rice and hemp protein are highly digestible and considered hypoallergenic. Rice protein is often recommended for people with food sensitivities — it is one of the most allergy-friendly protein sources available, and is even used in hypoallergenic infant formulas across the EU.
Hemp protein is also gentle on the stomach, and it has the added advantage of being mechanically processed — no chemical extraction residues to worry about. Both are suitable for people with dairy, soy, or gluten sensitivities.
Taste and texture
Rice protein has a very mild, neutral taste — slightly earthy but generally unnoticeable in shakes and smoothies. Its fine texture mixes well with liquids, making it a popular base for flavoured protein powders.
Hemp protein has a nutty, slightly earthy flavour that works well in baked goods, porridge, and yoghurt. Nordic Hemp’s 70% protein uses a proprietary physical treatment that gives it an even cleaner taste. Hemp also has a grainier texture because of its fibre content.
The environmental footprint
Both are more sustainable than animal protein. Rice uses less water than almonds or dairy, but it is a water-intensive crop compared to hemp. Rice paddies also produce methane, a potent greenhouse gas.
Hemp has a clear environmental edge: it grows fast, suppresses weeds, needs minimal pesticides, and improves soil structure. At Nordic Hemp, the whole plant is used — seeds, oil, protein, fibre and presscake — giving it a near-zero-waste profile. The company grows its own raw material on over 5,000 hectares of Estonian farmland, so the supply chain is short and fully traceable.
Can you combine rice and hemp protein?
Yes, but unlike rice and pea, the combination does not give you a perfect amino acid profile. Both are low in lysine, so combining them does not fix that gap. You would still need a lysine-rich source — like pea, soy, or legume protein — to complete the profile.
Still, commercial blends often pair hemp and rice alongside pea protein. The three together — pea, rice, hemp — cover all the bases: pea provides lysine, rice brings methionine, and hemp adds fibre and omega-3s.
For food manufacturers and formulators
Rice protein is a common ingredient in sports nutrition because of its neutral flavour and high protein content. It mixes cleanly into shakes and is often used in protein bars, meal replacement powders, and ready-to-drink formulas. The EU also approves it for hypoallergenic infant formulas.
Hemp protein works across a wide range of food categories. In bakery, its nutty flavour fits bread, muffins, crackers, and cookies. In protein bars, it adds body and a clean label. In breakfast cereals, granola, and porridge, the fibre content is a plus. Hemp protein also works in plant-based meat, pasta, snack foods, dairy alternatives like yoghurts, and meal replacements, where the omega-3s and minerals are a bonus. It is also used in smoothie mixes, soups, and sauces for protein fortification.
One practical difference: rice protein is a fine powder that blends into liquids with little grit. Hemp has a grainier texture because of its fibre, which is noticeable in drinks but works well in foods with texture — baked goods, patties, or thick shakes.
For brands that export to the EU, hemp protein from Nordic Hemp comes with EU Organic certification, non-GMO verification, and a fully traceable supply chain — the company grows on over 5,000 hectares of Estonian farmland and processes mechanically, so there are no chemical residues to declare. Both HP50 (25 kg bags, 750 kg per pallet) and HP70 (20 kg bags, 600 kg per pallet) are tested regularly from raw material to final product, with a shelf life of 24-36 months. Rice protein is available through specialist ingredient suppliers worldwide.
Which one should you choose?
Go with rice protein when your priority is protein density, a neutral flavour base, or a hypoallergenic option for sensitive formulations.
Hemp protein is the better call if you want whole-food nutrition — protein plus fibre, omega-3s and minerals — a clean mechanical process, zero heavy metal concerns, or a sustainable ingredient for everyday use.
If you are building a blended plant protein powder, use both and add a lysine-rich third source like pea to round out the amino acid profile.
Frequently asked questions
Is rice protein a complete protein?
No, rice protein is not a complete protein. It is low in the essential amino acid lysine, which means it does not contain all nine essential amino acids in sufficient amounts on its own. It is often paired with pea or legume protein to create a complete profile.
Which has more protein — rice or hemp?
Rice protein has more protein per gram — roughly 70-90% versus 50-70% for hemp. A 30 g serving of rice protein gives about 21-27 g of protein, while the same serving of hemp protein 50% gives about 15 g and hemp protein 70% about 21 g.
Does rice protein contain heavy metals?
Rice can absorb arsenic, cadmium and lead from soil more readily than most crops. FDA limits for rice protein are: total arsenic ≤0.2 mg/kg, cadmium ≤0.3 mg/kg, lead <0.25 mg/kg. Reputable manufacturers test for these. Hemp protein does not carry this concern.
Is rice or hemp protein better for muscle building?
Rice protein has a slight edge because it gives more protein per serving. Both are lower in leucine than pea or whey, so neither is ideal for muscle building on its own without complementing with other protein sources.
Can I take rice and hemp protein together?
Yes, but unlike rice and pea, rice and hemp do not complement each other perfectly because both are low in lysine. Combining them works best when a third protein — like pea — is added to complete the amino acid profile.
Is rice protein safe for people with allergies?
Yes, rice protein is one of the most hypoallergenic protein sources available. It is free from dairy, soy, gluten, and common allergens. Hemp protein is similarly hypoallergenic and allergen-free.
Which is better for the environment — hemp or rice protein?
Hemp protein has a lower environmental footprint. Hemp grows with minimal water and pesticides, improves soil structure, and is a zero-waste crop. Rice requires more water and rice paddies produce methane. Hemp’s whole-plant use makes it the more sustainable choice.
Looking for hemp protein as an ingredient?
Nordic Hemp produces organic hemp protein 50% and 70% in Estonia. EU Organic certified, mechanically produced, available in bulk for manufacturers worldwide.
View product detailsSources
- Nordic Hemp — Organic Hemp Protein 50% product page (nutritional data, processing, packaging)
- Nordic Hemp — Organic Hemp Protein 70% product page (nutritional data, patented mechanical process)
- Healthline — Hemp Protein Powder: The Best Plant-Based Protein? (amino acid and protein content context)
- FDA — GRAS Notice for Rice Protein (heavy metal limits)
- PMC — Hydrolyzed Rice Protein-Based Formulas in Infant Nutrition (hypoallergenic use in EU)
- MDPI — Arsenic in Rice and Rice-Based Products (2024) (heavy metal context)
