Short answer: the three seeds do not compete — they complement each other. Hemp seeds have the most protein and the most balanced omega fatty acids. Chia seeds have the most fibre and calcium. Flaxseeds have the most omega-3 (ALA) and by far the most lignans. If you only want to choose one as an everyday seed, hemp seed is the most complete — here are the figures behind it.
Nutritional Value per 100g
| Nutrient | Hemp Seed (hulled) | Chia Seed | Flaxseed |
|---|---|---|---|
| Energy (kcal) | 553 | 486 | 534 |
| Protein (g) | 31.6 | 16.5 | 18.3 |
| Total Fat (g) | 48.8 | 30.7 | 42.2 |
| – of which omega-3 (ALA) (g) | 8.7 | 17.8 | 22.8 |
| – of which omega-6 (linoleic) (g) | 27.5 | 5.8 | 5.9 |
| Omega-6 : omega-3 | ~3:1 | ~0.3:1 | ~0.26:1 |
| Carbohydrates (g) | 8.7 | 42.1 | 28.9 |
| Fibre (g) | 4.0* | 34.4 | 27.3 |
| Calcium (mg) | 70 | 631 | 255 |
| Iron (mg) | 7.95 | 7.7 | 5.73 |
| Zinc (mg) | 9.9 | 4.6 | 4.34 |
| Magnesium (mg) | 700 | 335 | 392 |
| Phosphorus (mg) | 1650 | 860 | 642 |
| Potassium (mg) | 1200 | 407 | 813 |
Source: USDA FoodData Central (hulled hemp seed FDC 170148, chia seed 170554, flaxseed 169414). Figures vary slightly between varieties and batches.
* Important about hemp seed fibre: 4.0g applies to hulled hemp seeds (hemp hearts), where the fibre-rich shell has been removed. Whole, unhulled hemp seeds contain significantly more fibre (~28–35g/100g). Therefore, compare apples with apples — hulled against hulled.
Hemp Seed — Most Protein and Best Omega Balance
Hemp seeds stand out on three points:
- Complete protein. Hemp seeds contain all nine essential amino acids, dominated by the protein edestin (~60–80%) plus albumin — both easily digestible. With 31.6g protein/100g, hulled hemp seeds meet the EU threshold for the nutrition claim "high protein content" (≥20% of energy from protein). Chia and flax meet "source of protein", but not "high".
- The most balanced omega ratio (~3:1). Hemp seeds provide both omega-3 and omega-6 in a ratio close to what is often highlighted in dietary contexts. Chia and flax are extremely omega-3 heavy.
- Mineral-dense. Magnesium 700mg, phosphorus, zinc and potassium are top among the three.
The taste is mild and nutty — hemp seeds do not need to be ground for the body to access the nutrients, unlike flaxseeds.
Chia Seed — Fibre and Calcium
Chia seed's signature is fibre: ~34g/100g, a large part of which forms the characteristic gel in liquid. It is also the best calcium source of the three (631mg). Chia protein is not considered complete in the same way as hemp (lower lysine), but the seed is a strong fibre and mineral supplement.
Flaxseed — Omega-3 and Lignans
Flaxseed is the superior omega-3 seed (22.8g ALA/100g) and the world's richest dietary source of lignans (SDG, ~600–1090mg/100g depending on the variety). Two caveats: whole flaxseeds largely pass undigested — ground flax provides much more available ALA and lignans. The composition is identical; it is the availability that differs.
Which Should You Choose?
| If you want most… | Choose |
|---|---|
| Protein (complete) | Hemp Seed |
| Balanced omega-6:3 | Hemp Seed |
| Magnesium / zinc | Hemp Seed |
| Fibre | Chia Seed |
| Calcium | Chia Seed |
| Omega-3 (ALA) & lignans | Flaxseed (ground) |
Easiest: use them together. A tablespoon of each provides protein, fibre, and omega-3 in the same bowl.
Frequently Asked Questions
Is hemp seed healthier than chia and flax?
It depends on what you are comparing. Hemp seed leads on protein, omega balance, and magnesium; chia on fibre and calcium; flax on omega-3 and lignans. They complement each other.
Do you have to grind hemp seeds?
No. Hulled hemp seeds are soft and the body can access the nutrients directly. Flaxseeds, however, should be ground.
Is hemp seed a complete protein?
Yes — it contains all nine essential amino acids, unlike chia and flax which have lower protein quality.
Hulled or whole hemp seeds?
Hulled have more protein and a milder taste; whole have more fibre thanks to the shell. Our guide on hulled vs unhulled goes deeper.
Further Reading
Sources
- USDA FoodData Central — https://fdc.nal.usda.gov/
- Motyka et al., Nutrients 2019 (chia) — PMC6627181
- Flaxseed functional-food review — PMC4375225
- Flaxseed lignans (SDG) — PMC6299007
- EU Reg (EC) 1924/2006, nutrition claims — eur-lex.europa.eu