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Vitamin D3
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin D3.
Recommendation: Take Vitamin D3 with Flaxseed Oil or another fat-containing meal to improve absorption.
Flaxseed Oil
Omega/Fatty Acid ·Moderate evidence ·Reviewed May 2026
Richest plant source of alpha-linolenic acid (ALA), a precursor to EPA/DHA.
The bottom line
Evidence rating moderate. Most-documented uses: plant omega-3, anti-inflammatory, heart health. 17 sources indexed (2006–2025), with 17 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
ALA is converted (inefficiently, ~5-10%) to EPA and DHA by delta-6 desaturase. Direct anti-inflammatory effects via ALA-derived resolvins. Lignans provide antioxidant benefits.14,16
Class
Plant-Based Omega-3
Found in food
Flaxseeds, Chia seeds, Walnuts
Low-status signs
Not essential if getting EPA/DHA
Absorption
Fat-soluble; take with food
Dosing
Dosing & protocol.
Common range
1-2 tablespoons or 1,000-2,000 mg daily
Recommended form
Cold-pressed organic flaxseed oil
Forms
Forms & what to buy.
Ranked by evidence and value.
Fresh Cold-Pressed Flaxseed Oil Recommended
Rank 1: best practical ALA oil form. Limited direct form-comparison evidence; ranking is based on review or mechanistic data (PMID: 33576691). Refrigerate and use quickly to reduce oxidation.
Lignan-Enriched Flax Oil
Rank 2: oil with added flax lignan fraction. Shake well; lignans settle.
Flaxseed Oil Softgels
Rank 3: portable oil capsules. Many softgels needed for tablespoon-equivalent dosing.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Cold-Pressed Flaxseed Oil.
BudgetBest value
$3.00 /mo
$0.10 per dose
Mid
$6.00 /mo
$0.20 per dose
Premium
$12.00 /mo
$0.40 per dose
Assumes 1 tablespoon or 1,000-2,000 mg/day. Vendor basis: NOW/iHerb, Vitacost, Amazon marketplace, and refrigerated oil products; bottles are cheaper than softgels. Updated 2026-05-28.
From food
The same dose, as food.
How much you'd eat to match a supplemental dose.
1-2 tablespoons flaxseed oil
About 1-2 tablespoons flaxseed oil, 2-4 tablespoons ground flaxseed, 2 tablespoons chia seeds, 1 ounce walnuts, or flaxseed dressing can supply similar ALA-rich fats.
Whole flaxseed adds fiber and lignans; oil mainly supplies fat.
Goals
Goal-based dosing.
Lab work
Markers to track.
What to test, the optimal window inside the conventional range, and how long a response takes.
Plasma Alpha-Linolenic Acid ALA
Flax oil raises plasma and erythrocyte ALA but produces only small increases in EPA and minimal change in DHA.8,9
Optimal
0.5–1.2 % of total fatty acids
Conventional
0.2–1.5 % of total fatty acids
Responds in
Plasma ALA rises within 1 week; erythrocyte changes take 8 to 12 weeks.
0.2optimal1.5
If the goal is raising EPA and DHA, fish oil or algae oil is more efficient than flax. Track Omega-3 Index for downstream effect.
Omega-3 IndexEPA
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Blepharitis and recurrent styes (eyelid margin inflammation and meibomian gland dysfunction)
50% relevance
Flaxseed provides plant ALA omega-3 and has shown modest benefit for ocular surface inflammation, though humans convert ALA to EPA/DHA inefficiently.
VisionEmerging evidenceCold-pressed flaxseed oil capsules
A weaker, lower-conversion option mainly for those avoiding marine oils; less effective than direct EPA/DHA for gland oil quality.
Protocols
Featured in protocols.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Plant-Based Nutrient Foundation
FoundationCoreModerate evidenceBeginner$30-55/mo
Dose here
1000-2000 mg daily, providing roughly 500-1000 mg ALA
Timing
With a meal containing fat, kept refrigerated and away from heat
Flaxseed oil supplies the plant omega-3 alpha-linolenic acid (ALA), since fish and fish oil are not vegan. Conversion of ALA to the active long-chain omega-3s EPA and DHA in humans is limited and variable, so this supports baseline ALA intake rather than guaranteeing EPA or DHA status.1,8
Safety
Full safety detail.
Interactions
Interaction records.
InfoSynergy
Vitamin D2
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin D2.
Recommendation: Take Vitamin D2 with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Vitamin K2
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K2.
Recommendation: Take Vitamin K2 with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Vitamin K1
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K1.
Recommendation: Take Vitamin K1 with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Vitamin K2 MK-4
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K2 MK-4.
Recommendation: Take Vitamin K2 MK-4 with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Vitamin A
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin A.
Recommendation: Take Vitamin A with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Vitamin E
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin E.
Recommendation: Take Vitamin E with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Coenzyme Q10
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Coenzyme Q10.
Recommendation: Take Coenzyme Q10 with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Coenzyme Q10 Ubiquinol
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Coenzyme Q10 Ubiquinol.
Recommendation: Take Coenzyme Q10 Ubiquinol with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Turmeric/Curcumin
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Turmeric/Curcumin.
Recommendation: Take Turmeric/Curcumin with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Curcumin Phytosome
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Curcumin Phytosome.
Recommendation: Take Curcumin Phytosome with Flaxseed Oil or another fat-containing meal to improve absorption.
InfoSynergy
Astaxanthin
Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Astaxanthin.
Recommendation: Take Astaxanthin with Flaxseed Oil or another fat-containing meal to improve absorption.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
9- 1Supplementation of Olive Oil and Flaxseed Oil on Blood Pressure and Inflammation in Healthy and At-Risk Adults: A Systematic Literature Review and Meta-AnalysisNeeds reviewPMIDMcNabb TB, Young I, Newman RG, Skinner RC, Benedito VA, Tou JC · Curr Hypertens Rev · 2024
Meta-analysis of 17 RCTs found no significant effect of OO and FLO supplementation on systolic blood pressure, diastolic blood pressure, CRP, IL-6, or TNF-alpha. Longer-duration, higher-dose RCTs are needed.
- 2Effect of Alpha-Linolenic Acid Supplementation on Cardiovascular Disease Risk Profile in Individuals with Obesity or Overweight: A Systematic Review and Meta-Analysis of Randomized Controlled TrialsNeeds reviewPMIDNaghshi S et al. · Nutrients · 2023
ALA supplementation significantly reduced CRP, TNF-alpha, triglycerides, and systolic blood pressure in overweight/obese individuals
- 3Dietary intake and biomarkers of alpha linolenic acid and risk of all cause, cardiovascular, and cancer mortality: systematic review and dose-response meta-analysis of cohort studiesNeeds reviewPMIDNaghshi S et al. · BMJ · 2021
Dietary ALA intake is associated with a reduced risk of mortality from all causes, CVD, and coronary heart disease
- 4Dietary Intake and Biomarkers of α-Linolenic Acid and Mortality: A Meta-Analysis of Prospective Cohort StudiesNeeds reviewPMIDChen LH, Hu Q, Li G et al. · Frontiers in nutrition · 2021
Chen LH, Hu Q, Li G et al.. Dietary Intake and Biomarkers of α-Linolenic Acid and Mortality: A Meta-Analysis of Prospective Cohort Studies. Frontiers in nutrition. 2021
- 5α-Linolenic Acid and Risk of Heart Failure: A Meta-AnalysisNeeds reviewPMIDWu J, Qiu M, Sun L et al. · Frontiers in cardiovascular medicine · 2021
Wu J, Qiu M, Sun L et al.. α-Linolenic Acid and Risk of Heart Failure: A Meta-Analysis. Frontiers in cardiovascular medicine. 2021
- 6Effect of flaxseed intervention on inflammatory markers: a systematic review and meta-analysis of randomized controlled trialsSource linkedPMIDMohammadi-Sartang M, Mazloom Z, Raeisi-Dehkordi H et al. · Cytokine · 2018
- 7alpha-Linolenic acid and risk of cardiovascular disease: a systematic review and meta-analysisNeeds reviewPMIDPan A et al. · Am J Clin Nutr · 2012
In observational studies, higher ALA exposure is associated with a moderately lower risk of cardiovascular disease
- 8Prospective studies of dietary alpha-linolenic acid intake and prostate cancer risk: a meta-analysisNeeds reviewPMIDCarayol M, Grosclaude P, Delpierre C · Cancer causes & control : CCC · 2010
Carayol M, Grosclaude P, Delpierre C. Prospective studies of dietary alpha-linolenic acid intake and prostate cancer risk: a meta-analysis. Cancer causes & control : CCC. 2010
- 9Effect of alpha linolenic acid on cardiovascular risk markers: a systematic reviewNeeds reviewPMIDWendland E, Farmer A, Glasziou P et al. · Heart (British Cardiac Society) · 2006
Wendland E, Farmer A, Glasziou P et al.. Effect of alpha linolenic acid on cardiovascular risk markers: a systematic review. Heart (British Cardiac Society). 2006
Randomized controlled trials
3- 10The effects of concurrent alpha-linolenic acid, L-carnitine supplementation on clinical symptoms, mental health, and quality of life in women with migraine: a randomized, triple-blind, placebo-controlled trialNeeds reviewPMIDGolpour-Hamedani S, Bagherniya M, Khorvash F et al. · Nutrition journal · 2025
Golpour-Hamedani S, Bagherniya M, Khorvash F et al.. The effects of concurrent alpha-linolenic acid, L-carnitine supplementation on clinical symptoms, mental health, and quality of life in women with migraine: a randomized, triple-blind, placebo-controlled trial. Nutrition journal. 2025
- 11Supplementation with Flaxseed Oil Rich in Alpha-Linolenic Acid Improves Verbal Fluency in Healthy Older AdultsNeeds reviewPMIDOgawa T, Sawane K, Ookoshi K, Kawashima R · Nutrients · 2023
In a randomized, double-blind, placebo-controlled trial of 60 healthy older adults, 12 weeks of flaxseed oil supplementation (2.2 g ALA/day) significantly improved verbal fluency scores compared to placebo.
- 12Flaxseed oil increases the plasma concentrations of cardioprotective (n-3) fatty acids in humansNeeds reviewPMIDHarper CR et al. · J Nutr · 2006
Plasma EPA levels increased 60% and DPA by 25% after flaxseed oil supplementation, but plasma DHA levels did not change, confirming limited ALA to DHA conversion
Reviews & position papers
5- 13The Role of Alpha-Linolenic Acid and Other Polyunsaturated Fatty Acids in Mental Health: A Narrative ReviewNeeds reviewPMIDBertoni C, Pini C, Mazzocchi A et al. · International journal of molecular sciences · 2024
Bertoni C, Pini C, Mazzocchi A et al.. The Role of Alpha-Linolenic Acid and Other Polyunsaturated Fatty Acids in Mental Health: A Narrative Review. International journal of molecular sciences. 2024
- 14A comprehensive review of the health benefits of flaxseed oil in relation to its chemical composition and comparison with other omega-3-rich oilsNeeds reviewPMIDParikh M et al. · Nutrients · 2023
Flaxseed oil, fibers, and lignans reduce cardiovascular disease, atherosclerosis, diabetes, cancer, and autoimmune disorders; ALA is anti-inflammatory
- 15The effect of flaxseed intake on appetite reduction: A systematic review of randomized clinical trialsNeeds reviewPMIDZarei M, Adeli S, Hosseini S, Daneshzad E · Phytother Res · 2022
Systematic review of 13 studies found some evidence that flaxseed reduces hunger perception and appetite, and increases fullness and satiety, though results were inconsistent across studies.
- 16Flax and flaxseed oil: an ancient medicine & modern functional foodNeeds reviewPMIDGoyal A et al. · J Food Sci Technol · 2014
Flaxseed oil exerts health benefits including reduction of cardiovascular disease, atherosclerosis, diabetes, cancer, arthritis, and osteoporosis
- 17Health benefits of flaxseed and its componentsSource linkedPMIDGoyal A, Sharma V, Upadhyay N et al. · J Food Sci Technol · 2014
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Flaxseed Oil in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.