Seed Labels: Hemp vs Chia vs Flax per Tablespoon
Hemp, chia and flax sit next to each other on the shelf, and all three get spooned onto oatmeal, yogurt and smoothies. Their labels are not built the same way, though. Serving sizes differ, a tablespoon of one seed weighs more than a tablespoon of another, and flax comes whole or ground under several names. This guide shows how to compare them fairly, using Manitoba Harvest Hemp Hearts and Bob’s Red Mill Golden Flaxseed Meal as the worked examples, with Bob’s Red Mill Organic Chia Seeds for chia.
How we wrote this: label numbers come from the Nutrition Facts panels on the Manitoba Harvest Hemp Hearts page and the Bob’s Red Mill Golden Flaxseed Meal page. The serving rules come from the reference amounts (RACC) in 21 CFR 101.12, read in October 2026. Chia figures come from the Bob’s Red Mill Organic Chia Seeds page. We read labels and rules; we did not lab test anything.
The short answer
Do not compare seed panels serving to serving. Turn each panel into a per tablespoon figure, or better, a per gram figure, since a tablespoon of hemp hearts weighs more than a tablespoon of flax meal. Then compare protein, fiber and fat. On our two examples, hemp hearts carry more protein and fat per tablespoon, and flax meal carries more fiber. Chia, by the same math on the Bob’s Red Mill panel, carries the most fiber of the three.
Step 1: Why the serving sizes differ
The FDA reference amount for nuts, seeds and mixtures is 30 g, and 21 CFR 101.12 lets labels state small pieces such as seeds in tablespoons or cups, with the gram weight in parentheses. The Manitoba Harvest panel follows that pattern exactly: a serving is 3 tbsp (30 g).
The Bob’s Red Mill flaxseed meal panel uses a much smaller serving: 2 tbsp (13 g). Ground flax is a fluffy meal, so a tablespoon weighs less, and the brand has set its serving at that size. Whatever the reason a brand chose, the effect is the same for you: the two panels describe very different amounts of food. Our almond label guide explains how the same 30 g reference amount works for nuts, so we will not repeat it here.
Step 2: Hemp vs chia vs flax per tablespoon
Dividing each panel by its number of tablespoons gives a fair side by side. Figures are rounded, and they are our arithmetic from each brand’s panel.
| Per 1 tbsp | Hemp hearts (Manitoba Harvest) | Ground flax (Bob’s Red Mill) | Chia (Bob’s Red Mill) |
|---|---|---|---|
| Weight | About 10 g | About 6.5 g | About 13 g |
| Calories | About 60 | About 35 | About 65 |
| Protein | About 3.3 g | About 1.5 g | 3 g |
| Dietary fiber | About 0.3 g | About 1.5 g | 5 g |
| Total fat | 5 g | About 2.5 g | 3.5 g |
The source panels: Manitoba Harvest lists, per 3 tbsp (30 g), 180 calories, 10 g protein, 1 g dietary fiber and 15 g total fat. Bob’s Red Mill lists, per 2 tbsp (13 g), 70 calories, 3 g protein, 3 g dietary fiber (11% DV) and 5 g total fat, with 0 g saturated fat, 0 mg sodium and 0 g added sugars. Bob’s Red Mill Organic Chia Seeds lists, per 2 tbsp (26 g), 130 calories, 6 g protein, 10 g dietary fiber (36% DV) and 7 g total fat.
Because a tablespoon of each seed weighs a different amount, a per gram view is even fairer. Per 10 g, hemp hearts come to about 3.3 g protein and 0.3 g fiber, while flax meal comes to about 2.3 g protein and 2.3 g fiber. Chia comes to about 2.3 g protein and 3.8 g fiber per 10 g. The pattern holds either way: hemp is the protein and fat seed, while chia and flax are the fiber seeds, chia more so.
For any other chia bag, check the serving line first, since it is in tablespoons and grams, then divide. Our hemp hearts label guide covers why the protein %DV can sit below the grams on a seed panel, which applies to every seed here.
One brand, two fiber numbers
Read the panel, not the marketing paragraph. On the Bob’s Red Mill page, a descriptive paragraph mentions 5 grams of fiber and 3.5 grams of total fat per two tablespoons, while the Nutrition Facts panel on the same page lists 3 g fiber and 5 g total fat. The panel is the regulated part of the label, so it is the number we used.
Step 3: Whole vs ground flax wording
Flax is sold in two forms, and the names vary:
- Whole flaxseed: the intact seed, with its hard, shiny coat.
- Ground flaxseed, milled flaxseed, flaxseed meal: three names for the same thing, the seed ground into a coarse powder. The Bob’s Red Mill page uses “ground flax,” “milled flaxseed” and “flaxseed meal” for one product.
- Golden vs brown: a color difference in the seed variety. It does not change the label rules; read each panel.
Bob’s Red Mill says milling makes the nutrients in flax more available than in whole seeds. That is the brand’s statement rather than a label rule, but it explains why ground flax is the form most recipes call for. The same page gives two kitchen uses: replace one egg with 2 tablespoons of ground flax mixed into 3 tablespoons of water, and replace oil or shortening with flax meal at a 3:1 ratio.
Hemp hearts are a different case. They are hulled hemp seeds, already soft, so they are sold whole and eaten as they are. Chia is usually sold whole too.
Step 4: Ingredient lines and allergens
A plain bag of seeds should list one ingredient. Manitoba Harvest lists fresh, high quality, Canadian grown hemp seeds; a plain flax meal lists flaxseed. Blends and flavored products are a different read: once a brand adds other seeds, sweeteners or seasonings, each has to appear in the ingredient list in order of weight. Sesame is one of the major allergens a US label must name, so a seed mix that includes sesame has to say so. Hemp, chia and flax are not on that list, so a plain bag may carry no allergen statement at all. Check for any shared-facility note if that matters to you.
Step 5: Storage after opening
Seeds are high in fat, so storage advice matters more once the bag is open.
- Ground flax: Bob’s Red Mill gives its ground flax a shelf life of one year and says to keep it refrigerated for freshness.
- Hemp hearts: Manitoba Harvest recommends the fridge once opened; the hemp hearts guide covers the details.
- Chia: follow the storage line on your bag; brands differ.
For any of them, reseal the bag or move the seeds to an airtight container, go by the best-by date on the pack, and smell before using. If an open bag smells off rather than mild and nutty, do not use it.
A quick checklist
- Note the serving in tablespoons and grams on each bag.
- Convert protein, fiber and fat to per tablespoon or per 10 g before comparing.
- Use the Nutrition Facts panel, not the marketing copy.
- For flax, check whether it is whole or ground; meal, milled and ground mean the same.
- Read the ingredient line on blends and the storage line on every bag.
FAQ
Which seed has the most protein per tablespoon?
Of our three examples, hemp hearts: about 3.3 g per tablespoon against 3 g for chia and about 1.5 g for flax meal, by our arithmetic from each brand’s panel.
Which has the most fiber?
Chia, at 5 g per tablespoon on the Bob’s Red Mill panel, then flax meal at about 1.5 g and hemp hearts at about 0.3 g, by our arithmetic. For a fiber product read the same way, see our psyllium husk label guide.
Is flaxseed meal the same as ground flaxseed?
Yes. Flaxseed meal, ground flaxseed and milled flaxseed all describe flax seeds ground into a powder.
Why is the flax serving only 2 tablespoons?
That is the serving Bob’s Red Mill uses on its panel, 2 tbsp (13 g). Ground flax is light, so compare per tablespoon or per gram rather than per serving.
Does ground flax need to go in the fridge?
Bob’s Red Mill says to keep its ground flax refrigerated for freshness.
Where to go next
For the wider pantry, see our pantry staples guide and all pantry products. Our guide to reading a Nutrition Facts label covers serving sizes and %DV in general. For a canned pantry staple read the same way, see our canned sardine label guide.