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AlternativeMed

Flaxseed

Flaxseed as a functional food: meta-analysis on apolipoproteins, why flaxseed oil is different from seed, and evidence gaps on ground versus whole.

Content last updated . This page has not been medically reviewed.

Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.

Overview

Flaxseed (linseed) is a small seed high in fiber and alpha-linolenic acid. This page covers the seed. Flaxseed oil is a different product with no fiber.

What the research shows

  • A 2024 GRADE-assessed meta-analysis of randomized trials found flaxseed supplementation reduced apolipoprotein B (SMD -0.57; heterogeneity I2 83%) and lipoprotein(a), but did not change apolipoprotein A-I. The authors call for high-quality long-term trials. [1] Note the very high heterogeneity: the trials differ a lot from each other.
  • A review of olive oil and flaxseed oil supplementation on blood pressure and inflammation exists; oil results should not be transferred to the seed. [2]

Not shown / proper evidence not found: we did not find a source comparing ground flaxseed with whole seed, or giving an evidence-based amount for health outcomes. "Ground flaxseed" has a large search interest (about 110,000 monthly US searches in Google Ads data, retrieved 2026-10-22). See Flaxseed vs chia.

Safety and individual considerations

  • Flaxseed adds fiber; increase gradually and with fluids if you have bowel disease or take medicines by mouth, and ask a clinician.
  • Pregnancy and hormone-sensitive conditions: proper evidence was not found in the sources we read, so we make no claim.

Related

Chia seeds · Nutrients and compounds

Frequently asked questions

Is ground flaxseed better than whole?

We did not find a source we could read that compares them in trials.

Is flaxseed oil the same as flaxseed?

No. The oil has no fiber. [2]

References

  1. Benam SP et al. Does flaxseed supplementation affect apo-lipoproteins? A GRADE-assessed systematic review and meta-analysis. Prostaglandins Other Lipid Mediat 2024. PMID 39002708.
  2. McNabb TB et al. Supplementation of Olive Oil and Flaxseed Oil on Blood Pressure and Inflammation in Healthy and At-Risk Adults: A Systematic Literature Review and Meta-Analysis. Curr Hypertens Rev 2024. PMID 39558500.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.