← All supplements

Flaxseed oil

Supplement fatty acid heart & metabolicwomen's health
Aka: linseed oil, alpha-linolenic acid
Brands seen in Singapore: California Gold Nutrition, Bob's Red Mill, Spectrum Essentials, Arrowhead Mills, NOW Foods
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
A plant omega-3 (ala) source · human data is limited
When to take
Daily
Take with
Absorption runs ~95%, similar to other ingested fats
Studied for
Safety data mostly covers up to 6 months
Pros & cons
Pros
  • Richest common food source of ala: 7.26 g per tbsp
  • Ala is the only omega-3 the body must get from food
  • Ai for ala is 1.6 g/day (men), 1.1 g/day (women)
Cons
  • Ala converts to EPA/DHA at under 15%
  • Higher doses can bring bloating, fullness, diarrhoea
  • Heart/brain claims rest on varying-quality research
Sources
  1. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “Plant oils that contain ALA include flaxseed (linseed), soybean, and canola oils … Flaxseed oil, 1 tbsp | 7.26 [g ALA] … Chia seeds, 1 ounce | 5.06”
  2. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “The AIs apply only to ALA because ALA is the only omega-3 that is essential. The IOM did not establish specific intake recommendations for EPA, DHA … 19–50 years 1.6 g (male) 1.1 g (female)”
  3. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “ALA can be converted into EPA and then to DHA, but the conversion (which occurs primarily in the liver) is very limited, with reported rates of less than 15%”
  4. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “The IOM did not establish a UL for any omega-3s … FDA has concluded that dietary supplements providing no more than 5 g/day EPA and DHA are safe when used as recommended”
  5. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “The U.S. Food and Drug Administration (FDA) has established a Daily Value (DV) of 65 g for total fat but not for omega-3s”
  6. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “The process is efficient, with an absorption rate of about 95%, which is similar to that of other ingested fats”
  7. NIH ODS — Omega-3 Fatty Acids (Health Professional) · read 2026-08-27
    what it says
    “Fish oil might prolong clotting times, as indicated by an elevated international normalized ratio (INR), when it is taken with warfarin … patients taking these products with anticoagulants should be monitored periodically for changes in INR”
  8. NIH NCCIH — Flaxseed and Flaxseed Oil: Usefulness and Safety · read 2026-08-27
    what it says
    “Today, flaxseed and flaxseed oil supplements are promoted for the heart, brain, and immune system … Some research of varying quality has studied the use of flaxseed or flaxseed oil supplements for several health purposes in people.”
  9. NIH NCCIH — Flaxseed and Flaxseed Oil, What Do We Know About Safety? · read 2026-08-27
    what it says
    “Limited amounts of flaxseed … or oral flaxseed oil supplements may be safe for use in the short-term (up to 6 months). Higher doses … may cause uncomfortable digestive symptoms like bloating, fullness, and diarrhea.”
  10. NIH NCCIH — Flaxseed and Flaxseed Oil, safety and interactions · read 2026-08-27
    what it says
    “There are theoretical reasons to suspect that flaxseed or flaxseed oil might interact with other drugs, such as anticoagulant or antiplatelet drugs … Little is known about whether it is safe to use flaxseed oil during pregnancy or while breastfeeding.”
  11. NIH NCCIH — Flaxseed and Flaxseed Oil, safety · read 2026-08-27
    what it says
    “Don’t eat raw or unripe flaxseeds; they may contain potentially toxic compounds.”
  12. HSA — Guidelines on prohibited and restricted ingredients in health supplements and traditional medicines (Oct 2025), Annex A/B · read 2026-08-27
    what it says
    “The objective of this guideline is to highlight the substances of concern when used in HS and TM and is not meant to be an exhaustive list.”
  13. iHerb Singapore — Flax Seed Oil & Supplements category page · read 2026-08-27
    what it says
    “Flax Seed Oil & Supplements”
Report a correction View as JSON

Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.