Two of the original green superfoods — but one is an algae and one is a grass, and that changes everything. Spirulina leads on protein and iron; wheatgrass leads on chlorophyll. Here's the honest comparison.
Spirulina is a blue-green algae grown in water — a complete protein, very protein-dense, and rich in iron and the blue antioxidant phycocyanin. Wheatgrass is the young grass of the wheat plant, usually juiced or powdered and taken as a “shot” — prized for chlorophyll and vitamins A, C, E and K. Both are green and good; they just lead with different strengths.
| Spirulina | Wheatgrass | |
|---|---|---|
| What it is | Blue-green algae, grown in water | Young grass of the wheat plant |
| Protein | ~60–70% by dry weight; complete | Modest; not complete |
| Standout nutrients | Iron, phycocyanin, B vitamins, complete protein | Chlorophyll, vitamins A, C, E & K |
| Iron | Dense (~10% DV per serving) | Present, lower |
| Usual form | Fresh-frozen cubes or powder | Fresh juice / shot, or powder |
| Typical taste | Earthy dried; fresh-frozen is flavor-free | Very grassy, strong, slightly sweet |
| Gluten | Naturally gluten-free | Grass is gluten-free, but check for cross-contamination |
Values are general and vary by product and growing conditions. For information only, not medical or dietary advice.
If your priority is protein and iron, spirulina clearly does more per serving — and fresh-frozen spirulina sidesteps the biggest knock on green superfoods, taste. Because it's never dried, it's virtually flavor-free, so it blends into a smoothie without the strong, grassy hit of a wheatgrass shot. Prefer the juice-bar ritual, or want to rotate your greens? Use both.
Both are nutritious, but they lead with different strengths. Spirulina is a complete, protein-dense algae rich in iron and phycocyanin; wheatgrass is a chlorophyll-forward grass with vitamins A, C, E and K, usually taken as a juice. Pick spirulina for protein and iron, wheatgrass for a chlorophyll green, or use both.
Spirulina, by a wide margin — about 60–70% complete protein by dry weight, versus a modest, incomplete amount in wheatgrass.
Both contain iron, but spirulina is more iron-dense (a 2-cube serving is ~10% DV, a tray ~50%). Pairing with vitamin C improves absorption of the plant iron.
Spirulina is naturally gluten-free (SimpliiGood is just spirulina and water). Wheatgrass is the grass, harvested before the grain forms, so the grass itself is gluten-free — but cross-contamination with the grain is possible, so people with celiac should choose a product tested and labeled gluten-free.
Yes — they complement each other. Spirulina brings complete protein and iron, wheatgrass brings chlorophyll and its own vitamins, so using both broadens your green intake. A fresh-frozen cube blends neatly into a wheatgrass smoothie or juice.
See also spirulina vs. chlorella and spirulina vs. moringa, or the Learning Center.