Marine Oils & Algae
Chlorella
1.1 Overview & Structure
Chlorella is a single-celled green algae that is a close relative of spirulina but has a very different physical build. It is famous for its incredibly rigid outer wall made of cellulose, which is the same tough material found in wood or plant stalks1. This wall is so strong that our stomachs cannot digest it naturally; therefore, the algae must have its cell wall “cracked” or broken during processing so we can reach the nutrients inside37. Once opened, it reveals a dense interior packed with more chlorophyll than any other plant on Earth, along with a high protein structure that makes up over half of its weight38. Chlorella (Chlorella vulgaris) is a single-celled green algae that differs from spirulina primarily by its rigid cellulose cell wall, which requires “cracking” during processing to make its nutrients bioavailable3. In the UK, it is highly sought after for having the highest chlorophyll content of any known plant, making it a premier choice for natural detoxification and blood health8. Unique to this organism is the Chlorella Growth Factor (CGF), a complex of nucleic acids and peptides that supports cellular repair and immune function, bridging a significant “Recovery Gap” in plant-based diets8.
1.2 Physical & Culinary Performance
When sold as a “broken cell wall” powder, chlorella has a very fine, flour-like thickness and a deep emerald colour3. It contains hemicellulose and beta-glucans, which are special types of fibre that act as a prebiotic, meaning they provide “food” for the good bacteria in your gut6. In the kitchen, it behaves much like spirulina, acting as a natural thickener in cold liquids. It is safe to eat raw and is best added to cold smoothies or uncooked soups, where its vibrant green colour remains stable and its delicate vitamins are not damaged by heat1.
1.3 Storage & Life Hacks
Because chlorella is so rich in active pigments like chlorophyll, it can degrade quickly if exposed to bright light or warmth8. It is best kept in an airtight container in a dark cupboard or the fridge to preserve its freshness. A useful “life hack” for those who find the earthy taste too strong is to blend it with acidic fruits like pineapple or lime; the acid helps mask the flavour while also making the high iron content easier for your body to absorb1.
1.4 Suitability & Ethics
Chlorella is a perfect vegan food and is naturally free from gluten, making it a very safe choice for most people9. It is especially helpful for vegans because it is one of the few plant sources that provides “active” Vitamin B12, which is a nutrient usually only found in animal products4. Ethically, it is an excellent choice as it can be grown in ultra-clean tanks that do not harm the ocean or use up forest land10. It even has a “heavy metal affinity”, which means it naturally pulls toxins out of its environment; this makes it great for detoxing the body, but it also means it must be grown in perfectly pure water78.
1.5 Seasonality & Environment
This algae does not have a traditional growing season because it is cultivated in indoor bioreactors that mimic the perfect summer day all year round11. It is an environmental “hero” because it is carbon-negative; it actually eats carbon dioxide to grow, which helps lower the amount of greenhouse gases in the air10. Compared to land-based protein like beef or even soy, chlorella uses a tiny amount of water and land to produce the same amount of nutrition10.
1.6 Safety & Consumption Context
Most people in the UK take chlorella as a daily supplement in tablet or powder form to help with “recovery” and energy1. However, some sources describe a need for moderation, especially for people who suffer from gout, because the algae is high in nucleic acids which can increase uric acid in the blood7. It is also very low in iodine compared to seaweeds, making it a safer green superfood for people who are sensitive to iodine or have certain thyroid conditions9.
1.7 Health & Nutrition Superpower
The primary “superpower” of chlorella is the Chlorella Growth Factor (CGF), a unique mix of nutrients that helps the body repair its own cells and supports a strong immune system8. It is also a powerhouse of Vitamin A and Iron, providing more than a full day’s supply in just a small portion3. Its world-leading density of chlorophyll helps with oxygenation, which is the process of getting more oxygen into your blood to help you feel more energetic8.
1.8 Microbial & Amino Profile
Chlorella provides a complete set of amino acids, which are the building blocks your body needs to stay strong5. It is particularly high in Tryptophan and Threonine, which are important for maintaining a happy mood and healthy skin5. Because it is a eukaryotic organism—meaning its cells are more complex than spirulina—its amino profile is very stable and provides a steady release of energy19.
1.9 Bioavailability & Antinutrient Dynamics
While the rigid cell wall is an “anti-nutrient” because it blocks access to vitamins, once it is mechanically “cracked”, the nutrients become highly bioavailable37. This means your body can absorb the minerals, like Zinc and Magnesium, much more easily than it can from many land vegetables3. The presence of hemicellulose also helps slow down the digestion process slightly, which allows your gut more time to pull all the goodness out of the algae6.
2. Land-Use & Human Labour Efficiency
This food is best grown in extremely tall or stacked bio-reactors.
Nutrients per Hectare (N/H) Scoring
- Traditional Production Score: 17/100
Current open-pond systems are efficient but still rely on large flat areas of land and are vulnerable to dust or contamination from the air10. - Ultra-Efficient Production Score: 100/100
Growing chlorella in 8-storey stacked glass tubes (photo-bioreactors) creates a “vertical forest” of nutrition. Because it is so dense in B12, Iron, and Vitamin A, it achieves a perfect efficiency score.
Human Labour Intensity (HLI) Scoring
- Traditional Labour Score: 72/100 (Large Amount of Manual Work)
Maintaining the purity of open ponds requires constant manual cleaning, water testing, and complex harvesting methods to separate the tiny cells from the water11. - Automated Labour Score: 2/100 (Tiny Amount of Manual Work)
In a vertical bioreactor, computers manage the “feeding” and light cycles, while automated centrifuges spin the algae out of the water, leaving humans to simply check the digital controls11.
3. Data Tables
1. Main Nutrients Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (34.5g). All details provided are for Chlorella (Dried/Broken Cell Wall)23.
| Nutrient | % Ref Value per 20g Protein Portion | Amount per 100g | UK Reference Value |
| Vitamin A (Beta) | 421.4%23 | 51300mcg3 | 4200mcg1 |
| Vitamin B12 (Active) | 320.6%24 | 130mcg4 | 14mcg1 |
| Vitamin B2 | 134.8%23 | 4.3mg3 | 1.1mg1 |
| Iron | 118.6%23 | 101mg3 | 29.4mg1 |
| Vitamin B1 | 53.3%23 | 1.7mg3 | 1.1mg1 |
| Protein | 44.4%23 | 58g3 | 45g1 |
| Phosphorus | 44.0%23 | 895mg3 | 700mg1 |
| Magnesium | 35.1%23 | 315mg3 | 310mg1 |
| Zinc | 25.0%23 | 7.1mg3 | 9.8mg1 |
| Energy | 7.1%23 | 411kcal3 | 2000kcal1 |
2. Amino Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (34.5g). All details provided are for Chlorella (Dried)25.
| Amino Acid | % Ref Value per 20g Protein Portion | Amount per 100g (g) | UK Reference Value (g) |
| Tryptophan | 111.5%25 | 0.845 | 0.261 |
| Threonine | 94.1%25 | 2.705 | 0.991 |
| Isoleucine | 75.8%25 | 2.905 | 1.321 |
| Phenylalanine | 60.6%25 | 2.905 | 1.651 |
| Valine | 60.5%25 | 3.005 | 1.711 |
| Leucine | 60.4%25 | 4.505 | 2.571 |
| Lysine | 56.1%25 | 3.205 | 1.971 |
| Methionine | 45.3%25 | 1.305 | 0.991 |
3. Fatty Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (34.5g). All details provided are for Chlorella (Dried)23.
| Fatty Acid | % Ref Value per 20g Protein Portion | Amount per 100g (g) | UK Reference Value (g) |
| Omega-3 ALA | 9.0%23 | 3.133 | 12.01 |
| Total Fat | 4.1%23 | 9.303 | 78.01 |
| Omega 3 (EPA + DHA) | 0.0%23 | 0.003 | 1.01 |
4. Fibre Fractions Table
Details for Chlorella6.
| Fibre Fraction | Amount per 100g | Description |
| Cellulose | 5.0g6 | Component of the cell wall; requires “cracking” for digestion3. |
| Hemicellulose | 3.0g6 | Provides prebiotic substrate for gut microflora6. |
| β-glucans | Trace6 | Immunomodulatory polysaccharides6. |
5. Anti-Nutritional Factors Table
Details for Chlorella7.
| Factor | Presence | Impact / Limitation |
| Cell Wall Rigidity | High7 | Limits nutrient absorption if not mechanically “broken”37. |
| Nucleic Acids | High7 | Can contribute to elevated uric acid (caution in gout)7. |
| Heavy Metal Affinity | High7 | Advantageous for detox, but requires ultra-pure cultivation78. |
6. Phytochemicals Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion. All details provided are for Chlorella8.
| Phytochemical | Amount per 100g | Potential Benefits |
| CGF (Growth Factor) | Around 5,000mg8 | Nucleotide-peptide complex for rapid cellular repair8. |
| Chlorophyll | 2,800mg8 | World-leading density for chelation and oxygenation8. |
| Lutein | 150mg8 | Critical for ocular protection against blue light8. |
7. Allergen & Suitability Table
Details for Chlorella9.
| Requirement | Status | Verification |
| Vegan | Suitable9 | Microscopic eukaryotic plant9. |
| Gluten-Free | Suitable9 | Naturally free from cereal proteins9. |
| Iodine | Low9 | Negligible compared to seaweeds; safe for thyroid9. |
8. Commercial Forms Table
Commonly available products in the UK.
| Product Name | Format | Typical UK Retailer |
| Sun Chlorella ‘A’ Tablets | Tablets | Sainsbury’s |
| Sevenhills Wholefoods Chlorella | Powder | Amazon.co.uk |
9. Environmental Indicators Table (Current Traditional Agriculture)
Strictly sorted in descending order by Value per 20g Protein Portion. All details provided are for Chlorella10.
| Indicator | Traditional Value (per 100g) | Value per 20g Protein Portion | Traditional Context |
| Water Footprint | ~45 L10 | 15.5 L210 | Highly efficient compared to any land crop10. |
| Land Use | ~0.015 m²10 | 0.005 m²210 | Vertical bioreactor potential is extreme10. |
| Carbon Footprint | ~-0.08 kg CO2e10 | -0.02 kg CO2e210 | Net-negative; algae consume CO2 as fuel10. |
10. Home Growing & Aeroponic Audit
Details for Chlorella11.
| Growing Method | Feasibility | Aeroponic / Method Benefits |
| Home Growing | Medium11 | Possible in simple bubbler tanks; requires filtration11. |
| Aeroponics | Low11 | Aquatic; requires liquid submersion to avoid desiccation11. |
Technical Limitation: Chlorella is a single-celled aquatic organism that must remain fully submerged in a nutrient-rich liquid medium to facilitate gas exchange and cell division. It cannot survive in the air-mist environment of an aeroponic facility11.
Sources & Endnotes – please see the References & Bibliography section for full details of all sources:
- Throughout this audit, each food’s nutrient content has been compared to the Reference Daily Intakes (RDIs) of different nutrients, essential fats and amino acids for 21-24 year old females. These were based on data from the World Health Organisation (WHO), the USDA Dietary Guidelines, and the UK Scientific Advisory Committee on Nutrition (SACN). For full details, visit: https://naturalhuman.co.uk/reference-intakes/. These values were selected solely as a standardised, fixed benchmark to calculate and compare the exact percentage of nutrients provided by different foods per portion. Using a single baseline like this allows for an objective, side-by-side comparison of individual foods’ nutritional profiles; however, these targets are not universally applicable & must not be considered to be a recommendation.
- Google AI – Calculated portion size based on protein density of 58g per 100g.
- USDA FoodData Central – Chlorella, dried – usda.gov
- Nutrients Journal – Vitamin B12 bioavailability in Chlorella – mdpi.com
- ScienceDirect – Amino Acid profiling of Chlorella vulgaris – sciencedirect.com
- Journal of Functional Foods – Structural polysaccharides of algae – sciencedirect.com
- EFSA – Safety and toxicity assessment of Chlorella – europa.eu
- Marine Drugs – Phytochemical analysis of CGF and Chlorophyll – mdpi.com
- NHS UK – Algal supplements and thyroid safety – https://www.nhs.uk
- Water Footprint Network – Environmental metrics for algal biomass – https://waterfootprint.org
- FAO – Micro-algae cultivation systems for human food – fao.org
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