Fatty Acid
Algal Oil
Also known as: microalgae oil, algae oil, marine algae oil
Algal oil is a plant-based source of omega-3 fatty acids (EPA and DHA) derived from microalgae, offering a vegetarian alternative to fish oil. It provides bioavailable long-chain omega-3s without fish-related contaminants or sustainability concerns.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Algal Oil product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Complement Essential | 86 A- | $1.48 |
| 2 | New Chapter Vegan Omega-3 Complex | 80 A- | $1.00 |
| 3 | Vital Nutrients Ultra Pure Vegan Omega SPM+ | 72 B | $2.23 |
| 4 | Carlson Vegetarian Plant-Based DHA | 70 B | $1.00 |
| 5 | Carlson Vegetarian DHA | 69 B | $1.45 |
| 6 | Carlson Vegetarian Prenatal DHA | 68 B | $1.66 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Algal Oil should I take?
The typical range is 1,000-3,000 mg daily (containing 200-1,000 mg combined EPA+DHA). Consistent daily use for 4-12 weeks typically needed to observe cardiovascular or cognitive effects
When should I take Algal Oil?
With meals to improve absorption. Take with food containing fat for optimal absorption.
Which form of Algal Oil is best?
Softgels. Other forms in the catalog: Liquid.
Is Algal Oil safe?
Commonly reported: Mild fishy aftertaste (less common than fish oil), Gastrointestinal upset in sensitive individuals, Nausea at high doses.
Which Algal Oil supplement scores highest?
Complement Essential, at 86/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Cardiovascular health
- Brain health and cognitive function
- Inflammation management
- Vegetarian/vegan omega-3 supplementation
What systematic reviews concluded
Outcomes that systematic reviews of Algal Oil reached a verdict on: 2 with a benefit, 1 with no effect, 1 with harm reported, 1 unclear. Each is quoted from a review and linked to it on PubMed. How these were read.
Reviews found a benefit (2)
“The pooled estimate for the change in TG concentration was -0.20 mmol/L (95% CI: -0.27 to -0.14), 0.23 mmol/L (95% CI: 0.16-0.30) for LDL-C, and 0.07 mmol/L (95% CI: 0.05-0.10) for HDL-C.” PMID 22113870
“DHA supplementation from algal oil, a marine source of (n-3) fatty acids not extracted from fish, may reduce serum TG and increase HDL-C and LDL-C in persons without coronary heart disease.” PMID 22113870
Reviews found no effect (1)
“There may be little to no difference in feeding intolerance or time to achieve full enteral feeds.” PMID 41609005
Harm reported (1)
“DHA supplementation from algal oil, a marine source of (n-3) fatty acids not extracted from fish, may reduce serum TG and increase HDL-C and LDL-C in persons without coronary heart disease.” PMID 22113870
Not enough to say: parenteral nutrition-associated liver disease.
2 findings from reviews in specific patient groups (such as cancer, pregnancy or surgery) are not shown here.
How it works
- Provides EPA and DHA which incorporate into cell membranes
- Reduces inflammatory markers (IL-6, TNF-α)
- Improves endothelial function and blood flow
- Supports neural cell integrity and synaptic plasticity
Dosage
- Typical range
- 1,000-3,000 mg daily (containing 200-1,000 mg combined EPA+DHA)
- Timing
- With meals to improve absorption
- With food
- Take with food containing fat for optimal absorption
- Duration
- Consistent daily use for 4-12 weeks typically needed to observe cardiovascular or cognitive effects
- Special populations
- Safe during pregnancy/lactation when providing adequate DHA (typically 200-300 mg DHA/day); appropriate for vegetarians and vegans
Forms
- Softgels· 70/100
- Liquid· 70/100
Safety
Common side effects
- Mild fishy aftertaste (less common than fish oil)
- Gastrointestinal upset in sensitive individuals
- Nausea at high doses
Contraindications
- Caution with anticoagulant/antiplatelet medications at very high doses (>3 g EPA+DHA daily)
- Fish or shellfish allergies (though algal oil avoids this issue)
- Bleeding disorders without medical supervision
Products containing Algal Oil
Top-scoring supplements in our catalog that list Algal Oil on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Known interactions
- Synergywith curcumin
Fat improves curcumin absorption
- Warningwith omega-3
Fish oil may increase bleeding risk with warfarin
- Cautionwith omega-3
Fish oil adds to aspirin's antiplatelet effect
- Synergywith vitamin d
Fat improves vitamin D absorption
- Synergywith omega-3
Vitamin E protects omega-3 fats from oxidation
Evidence notes
Algal oil has good evidence for bioavailability and effectiveness comparable to fish oil in raising EPA/DHA levels. Multiple RCTs support cardiovascular and cognitive benefits, though fewer studies exist than for fish oil. Standardization and source variation affect quality.
Grade B: Some human trials support key claims; further confirmation needed.
Related in Fatty Acid
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.