Marine Oils & Algae
Algal Oil
1.1 Overview & Structure
Algal oil is the primary vegan source of essential long-chain fats, specifically EPA and DHA, which are usually missing from land plants1. While seeds like flax contain a short-chain fat called ALA, the human body is very inefficient at converting this into the DHA needed for the brain36. This oil is made by micro-algae, which are tiny single-celled plants that live in water4. To make the oil, the algae are grown in large tanks and then processed to remove their tough outer walls, releasing the rich fats stored inside8. Because it is a refined fat, it contains almost no protein or fibre, as these parts are removed during extraction to ensure the oil is pure and concentrated 3 12.
Algal oil is the primary vegan source of Omega-3, providing the long-chain forms of Omega 3, EPA (Eicosapentaenoic Acid) and DHA (Docosahexaenoic Acid), that are typically absent in land-based plants1. While seeds provide the ALA form of Omega 3, the human body’s conversion rate to DHA can be as low as 1–5%3. Algal oil bypasses this by going directly to the original source, the micro-algae that fish consume to obtain their own Omega-34. In the UK, it is considered a critical supplement for supporting brain health, reducing inflammation in the body and maintaining cardiovascular integrity5.
1.2 Physical & Culinary Performance
In its pure form, algal oil is a thick, golden liquid that stays fluid even at cool temperatures1. It acts as a powerful carrier for vitamins, helping the body absorb nutrients that only dissolve in fats5. The oil is very sensitive to heat and should not be used for frying, as high temperatures can damage the delicate molecular bonds of the Omega-3s1. It is best used raw, such as being stirred into cold uncooked soups or blended into smoothies1. In these recipes, it acts as an emulsifier, which is a substance that helps mix water and oil together to stop ingredients from separating1.
1.3 Storage & Life Hacks
This oil is highly prone to oxidation, which is a chemical reaction with oxygen that makes the oil go rancid and smell like old fish14. To keep it fresh, it must be stored in a cool, dark place away from sunlight, as light can speed up the breakdown of the healthy fats1. A clever “life hack” is to keep the oil in the fridge and ensure the lid is tightened immediately after use to minimise air contact1. Checking the “TOTOX” score, which is a measure of the total freshness and lack of damage in the oil, is the best way to ensure it remains anti-inflammatory and beneficial for the heart14.
1.4 Suitability & Ethics
Algal oil is a 100% vegan product derived from fermented micro-algae, making it a perfect alternative to fish-based supplements1. It is naturally free from gluten and is considered the safest option for people with fish or shellfish allergies113. Ethically, it is superior to traditional marine oils because it prevents “ocean depletion”, which is the stripping of life from the sea13. Producing one tonne of this oil can save approximately 60,000 fish from being harvested for their oil13.
1.5 Seasonality & Environment
Because this oil is produced in closed-loop bioreactors, which are controlled indoor tanks, it has no natural season and can be made year-round in the UK12. This method is highly efficient, using very little water and a small amount of land compared to open-field crops12. The carbon footprint is low because the algae actually sequester carbon, which means they pull carbon dioxide out of the air as they grow12. By “farming” these nutrients in tanks, we avoid the environmental damage caused by industrial fishing fleets13.
1.6 Safety & Consumption Context
Some sources describe algal oil as a very potent supplement, and only a small daily dose is needed to reach the recommended UK intake of 1g of EPA and DHA15. While it is very healthy, consuming massive quantities is unnecessary and could lead to an upset stomach due to the high fat density7. Traditionally, it is taken alongside a main meal to help with digestion and to balance the intake of other fats1. It is widely available in the UK as capsules or liquid drops from retailers like Holland & Barrett or Myprotein1011.
1.7 Health & Nutrition Superpower
The “superpower” of algal oil is its incredible density of DHA, which is a specific fat that supports the structure of the brain and eyes34. It also contains high levels of Vitamin E, which acts as a natural shield to protect the oil and your body’s cells from damage4. Additionally, it often contains Astaxanthin, a potent antioxidant that gives some algae a reddish tint and helps keep the oil stable3. These nutrients work together to reduce inflammation and maintain the integrity of the cardiovascular system5.
1.8 Synthetic vs. Natural Synergy
Algal oil often has Vitamin D added to it, creating a natural synergy that mimics the nutrition found in whole oily fish5. Vitamin D is “fat-soluble”, meaning it needs a fatty environment to be absorbed by the human gut1. The rich Omega-3 content in the algal oil provides the perfect vehicle for this absorption, ensuring the vitamin reaches the bloodstream efficiently1. This combination of natural algal fats and added vitamins creates a highly bioavailable supplement that supports both bone health and brain function15.
1.9 Processing Fidelity & Stability
Because algal oil is extracted from micro-algae, the process must be handled with extreme care to maintain “fidelity”, which is the original, undamaged state of the molecules8. Using cold-press or gentle fermentation methods ensures that the EPA and DHA remain stable and do not turn into “trans-fats”, which are unhealthy fats with a damaged structure814. High-quality refined algal oil maintains its nutritional value because it is kept in a sterile, oxygen-free environment from the moment of extraction until it is sealed in a capsule10.
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: 10/100
Current traditional methods for obtaining these long-chain fats rely on massive industrial fishing, which is incredibly land-inefficient when considering the vast ocean areas required to support fish populations13. - Ultra-Efficient Production Score: 99/100
Using extremely tall vertical bio-fermentation tanks allows for the production of massive amounts of DHA in a tiny footprint. This method provides the highest possible nutrient aggregate per square metre by stacking the “crop” hundreds of feet high in sterile environments.
Human Labour Intensity (HLI) Scoring
- Traditional Labour Score: 90/100 (Large Amount of Manual Work)
Industrial fishing and fish oil processing involve dangerous, high-intensity manual work on ships and in heavy industrial refineries1. - Automated Labour Score: 3/100 (Tiny Amount of Manual Work)
Bio-fermentation is a highly technical, closed-loop system where AI monitors the nutrient levels and temperature, with automated robots handling the harvesting and oil extraction12.
3. Data Tables
Algal Oil (Refined)
1. Main Nutrients Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (20,000g). All details provided are for Algal Oil (Refined)12.
| Nutrient | % Ref Value per 20g Protein Portion | Amount per 100g | UK Reference Value |
| Total Fat | 25,641.0%2 | 100g3 | 78g1 |
| Vitamin E | 13,333.3%2 | 10mg4 | 15mg1 |
| Energy | 9,000.0%2 | 900kcal3 | 2,000kcal1 |
| Vitamin D | 6,666.7%2 | 5mcg5 | 15mcg1 |
| Protein | 44.4%2 | 0.1g3 | 45g1 |
| Sodium | 12.5%2 | 1mg3 | 1,600mg1 |
| Iodine | 6.7%2 | 0.05mcg4 | 150mcg1 |
| Potassium | 5.7%2 | 1mg3 | 3,500mg1 |
2. Amino Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (20,000g). All details provided are for Algal Oil (Refined)12.
| Amino Acid | % Ref Value per 20g Protein Portion | Amount per 100g (g) | UK Reference Value (g) |
| Valine | 11.7%2 | 0.0016 | 1.711 |
| Lysine | 10.2%2 | 0.0016 | 1.971 |
| Leucine | 7.8%2 | 0.0016 | 2.571 |
3. Fatty Acid Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion (20,000.0g). All details provided are for Algal Oil12.
| Fatty Acid | % Ref Value per 20g Protein Portion | Amount per 100g (g) | UK Reference Value (g) |
| Omega 3 (EPA + DHA) | 12000.00% | 60.0 | 1.01 |
| Total Fat | 25641.00% | 100.0 | 78.01 |
| Omega-3 ALA | 16.7% | 0.01 | 12.01 |
4. Fibre Fractions Table
Details for Algal Oil12.
| Fibre Fraction | Amount per 100g | Description |
| Soluble Fibre | 0g | Removed during extraction12. |
| Insoluble Fibre | 0g | Removed during extraction12. |
5. Anti-Nutritional Factors Table
Details for Algal Oil1314.
| Factor | Presence | Impact / Limitation |
| Oxidation (Peroxide) | Low | Rancid oil causes inflammation; check “TOTOX” score14. |
| Environmental Toxins | Very Low | Grown in closed tanks, avoiding ocean heavy metals13. |
6. Phytochemicals Table
Strictly sorted in descending order by % Ref Value per 20g Protein Portion. All details provided are for Algal Oil34.
| Phytochemical | Amount per 100g | Potential Benefits |
| Astaxanthin | 5 – 10mg | Potent antioxidant often added for stability3. |
| Carotenoids | Trace | Supports ocular health4. |
7. Allergen & Suitability Table
Details for Algal Oil113.
| Requirement | Status | Verification |
| Vegan | Suitable | Derived from fermented microalgae1. |
| Gluten-Free | Suitable | No grain contact in extraction1. |
| Fish/Shellfish | Free | Safest alternative for those with fish allergies13. |
8. Commercial Forms Table
Commonly available products in the UK1011.
| Product Name | Format | Typical UK Retailer |
| Myprotein Vegan Omega-3 | Capsules | Myprotein10 |
| Together Health Algae Omega-3 | Capsules | Holland & Barrett11 |
9. Environmental Indicators Table (Current Traditional Agriculture)
Strictly sorted in descending order by Value per 20g Protein Portion. All details provided are for Algal Oil1213.
| Indicator | Traditional Value (per 100g) | Value per 20g Protein Portion | Traditional Context |
| Ocean Depletion | 0% | 0% | Prevents overfishing (1 tonne oil = 60k fish)13. |
| Carbon Footprint | ~0.12 kg CO2e | 24.0 kg CO2e | Low; algae sequester CO2 during growth12. |
| Water Footprint | ~10 L | 2,000 L | High efficiency in closed-loop bio-reactors12. |
10. Home Growing & Aeroponic Audit
Details for Micro-algae (Schizochytrium sp.).
| Growing Method | Feasibility | Aeroponic / Method Benefits |
| Home Growing | Low | Requires sterile bioreactors and centrifuge for oil. |
| Aeroponics | Low | Algae requires full immersion in liquid media. |
Technical Limitation: Micro-algae are aquatic single-celled organisms that require a liquid suspension (aqueous media) to facilitate nutrient exchange and photosynthesis or fermentation. They cannot grow in the air-mist environment of an aeroponic facility and require specialised bioreactor tanks.
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 0.1g per 100g.
- Nutrients – Long-chain omega-3 fatty acids and the brain.
- Marine Drugs – Micro-algae as a Source of Omega-3 Fatty Acids.
- British Nutrition Foundation – Essential Fatty Acids.
- PMC – Conversion of ALA to EPA and DHA in Humans.
- Healthline – Algal Oil: Benefits, Dosage, and Side Effects.
- ScienceDirect – Extraction and purification of algal oils.
- Journal of Applied Phycology – Schizochytrium as a source of DHA.
- Myprotein UK – Vegan Omega-3 Product Specs.
- Together Health – Algae Omega-3 Information.
- Water Footprint Network – Industrial Micro-algae Production.
- Our World in Data – Fish and Overfishing Impacts.
- GOED Omega-3 – Global standards for Peroxide and Anisidine.
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