Phytoplankton vs Chlorella

We sell both of these, which means we have no commercial interest in steering you toward one over the other. What we do have, after formulating with both organisms for years, is a clear view of when each one earns its place in your routine and when choosing the wrong one means you are solving a problem you do not have while ignoring one you do.

The Omega-3 Difference Between Phytoplankton and Chlorella

This is the dividing line. Nannochloropsis phytoplankton produces EPA at concentrations that make it one of the richest plant sources of this fatty acid. We chose it for ULTANA specifically because of that EPA profile.

Chlorella produces negligible long-chain omega-3. Its fatty acid content is primarily ALA, a short-chain form your body converts at rates too low to be nutritionally useful at supplement doses. If you are buying chlorella for omega-3, you are buying the wrong product.

If you need plant-based EPA: phytoplankton. If you do not care about EPA and want chlorophyll, protein, and micronutrient breadth: chlorella. If you want both: buy both. We make both because they serve different jobs.

The Chlorophyll and Protein Difference Between Chlorella and Phytoplankton

Chlorella wins on both counts, and the margin is not subtle. Roughly 50 to 60 per cent protein by dry weight versus 30 to 45 per cent for Nannochloropsis. Open both tubs side by side and the chlorella is visibly darker green — the highest chlorophyll concentration of any common food versus meaningful but lower levels in phytoplankton. If green nutrient density is what you value, chlorella is the denser package per gram.

We covered the full chlorella nutrition profile and the phytoplankton nutrition profile in separate articles. The numbers are not close on protein and chlorophyll. Chlorella is meaningfully ahead on both.

Phytoplankton brings its own strengths: the EPA already discussed, plus a distinctive carotenoid profile (violaxanthin, vaucheriaxanthin) that chlorella does not provide. The comparison is not better-or-worse. It is different-jobs.

The Purity and Processing Difference

Both organisms can be grown in open ponds or closed photobioreactor systems, and the purity implications are the same regardless of species. What differs is the post-harvest processing.

Chlorella requires broken-cell-wall or fermented processing because its tough cellulose wall blocks nutrient absorption. If you buy chlorella without cell-wall processing, you are getting less nutritional value per gram. We chose fermented processing for our chlorella because it breaks down the wall more thoroughly than mechanical cracking.

Nannochloropsis does not have the same cell-wall barrier. The nutrients are accessible without additional processing, which simplifies the production chain and removes one variable from the quality equation.

When to Choose Phytoplankton, Chlorella, or Both

Choose Phytoplankton If You Need EPA Omega-3

You need plant-based EPA and cannot get it from your diet. You want the EFSA heart-function claim coverage at 250mg combined EPA and DHA daily (with DHA from a separate source like algae oil). You value the carotenoid profile specific to Nannochloropsis.

Choose Chlorella If You Want Nutrient Density

You want the highest possible chlorophyll concentration in a single supplement. You want the densest plant protein per gram. You are already covering your EPA and DHA needs from other sources. You value iron, B vitamins, and broad micronutrient breadth over omega-3 specifically.

Choose Both If the Nutrient Profiles Complement Your Needs

EPA from phytoplankton and chlorophyll-protein density from chlorella. The two organisms complement each other nutritionally rather than overlapping. We explained the combination logic in our multi-algae synergies article.

What We Learned Formulating Both Products

Growing both organisms gave us a direct comparison that most articles about these species cannot offer. The nutrient profiles are genuinely different. The processing requirements are different. The contamination considerations during cultivation are similar, but the post-harvest steps diverge.

The most common mistake we see in this category is people treating chlorella and phytoplankton as interchangeable green powders. They are not. If you are spending money on algae supplements, matching the organism to your actual nutritional gap is the difference between a useful supplement and an expensive habit.

Phytoplankton vs Chlorella FAQs

Can chlorella replace phytoplankton for omega-3?

No. Chlorella produces negligible long-chain omega-3. Its fatty acids are primarily short-chain ALA, which converts to EPA at rates too low to be nutritionally useful. If you need plant-based EPA, phytoplankton is the source. Chlorella cannot fill that role.

Can phytoplankton replace chlorella for protein and chlorophyll?

Not at comparable density. Phytoplankton provides 30 to 45 per cent protein versus chlorella's 50 to 60 per cent. Chlorophyll concentration is also lower. If protein density and chlorophyll are your priorities, chlorella delivers more per gram.

Is one better than the other overall?

Neither is categorically better. They serve different nutritional purposes. The right choice depends on what you actually need. If you need EPA, phytoplankton. If you need broad micronutrient density and protein, chlorella. If you need both, take both.

Why does Phytality sell both organisms?

Because they complement rather than compete. We formulate ULTANA around Nannochloropsis for its EPA content and our chlorella around a fermented strain for protein density and chlorophyll. Each product addresses a nutritional job the other cannot do as well.

Does chlorella need cell-wall processing and phytoplankton does not?

Yes. Chlorella has a tough cellulose cell wall that blocks nutrient absorption unless broken down through mechanical cracking or fermentation. Nannochloropsis does not have this barrier, so its nutrients are accessible without additional processing.

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult your GP or a qualified healthcare professional before starting any supplement.

Methodology and Disclosure

Nannochloropsis lipid data cites Ma et al. 2016 (Mar Drugs). Chlorella nutritional profile cites Bito et al. 2020 (Nutrients). EFSA health claims cite Commission Regulation (EU) No 432/2012. Protein and chlorophyll comparisons reflect published compositional data for both species.

Vendor disclosure: Phytality manufactures and sells both phytoplankton (ULTANA) and chlorella products. We have no commercial interest in steering you toward one over the other. The comparison reflects genuine nutritional differences between the two organisms.