The Health Benefits of Flaxseed Oil

Flaxseed oil can reduce inflammation and promote heart and skin health

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Flaxseed oil is made from ground and pressed flax seeds. It is known for its many health benefits, including lowering inflammation, preventing heart disease, and reducing cancer risk. There are many more health benefits, along with some side effects and precautions to take when adding flaxseed oil to your diet.

Also Known As

  • Flax oil
  • Linseed oil

Health Benefits

Flaxseed oil contains many active and helpful compounds, including: 

  • Omega-3 fatty acids
  • Healthy proteins that may decrease risk factors of heart disease
  • Fiber to prevent digestive issues and constipation
  • Phenolic compounds (lignans), which may prevent cancer
  • Minerals, including calcium and magnesium

Here are some of the impressive health benefits of flaxseed oil and evidence to back up these claims. 

Health Benefits of Flaxseed Oil
Verywell / Brianna Gilmartin

Lowers Inflammation 

Because flaxseed oil contains omega-3 fatty acids, it may reduce inflammation. One animal study published in 2013 found flaxseed oil is loaded with anti-inflammatory properties and that these offered impressive inflammation-lowering benefits. However, studies in humans have yielded mixed results. 

One analysis of multiple human studies found flaxseed contained compounds helpful for reducing C-reactive protein (an inflammation marker) in some of the study participants.

The analysis indicates the properties of flaxseed oil may affect people differently and, therefore, more research is needed to determine its effects on inflammation in the general population.

Reduces Cancer Risk 

Flaxseed oil contains linoorbitides, compounds known for their cancer-fighting and antioxidant properties. The oil is also a rich source of dietary lignans, which have been found to reduce breast cancer risk.

Alpha-linolenic acids (ALA) in flaxseed oil may also slow down the growth of cancer cells and even kill them. While the research on ALA and cancer risk reduction is promising, the amount needed to make it a helpful therapy is excessive, which poses the risk for significant side effects and complications.

Promotes Heart Health

Studies have found that flaxseed oil supplements can increase omega-3 fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)—essential compounds for promoting a healthy heart and preventing heart disease.

ALA is converted to EPA and DHA in the body, while flaxseed naturally contains omega-3 fatty acids.

Improves Gut Health 

Flaxseed oil has laxative properties. In a study of 50 hemodialysis patients, daily supplementation of flaxseed oil helped relieve constipation.

A small study of people with irritable bowel syndrome (IBS) published in 2012 found that flaxseeds were helpful in lowering inflammation associated with IBS symptoms, including constipation and diarrhea.

Improves Skin 

Low ALA is connected to skin problems, and because flaxseed oil is high in ALA, it may support skin health.

Research shows flaxseed oil may help with reducing skin cell inflammation and promoting skin regeneration.

Aids in Weight Loss 

Flaxseed oil may keep things moving along in the digestive system to detoxify the body and help with weight loss.

In fact, a 2012 report in the journal Appetite finds that flaxseed oil can help with suppressing appetite, allowing for reduced food intake and weight loss. 

Reduces Menopause Symptoms 

There has been some evidence flaxseed oil may help with menopause symptoms. One 2015 study of 140 menopausal women using flaxseed oil supplements showed decreased hot flashes and increased life quality.

Possible Side Effects

Flaxseed oil is usually safe for most adults when taken by mouth correctly and in the short term. Large doses can cause diarrhea and loose stools. Allergic reactions are also possible. 

There has been some research, such as a 2010 study in The American Journal of Clinical Nutrition, suggesting ALA can increase the risk of prostate cancer or promote tumor growth. However, much of this research is speculative and other research suggests flaxseed can actually benefit men’s prostate health. 

Additional research shows ALA from animal-based foods high in saturated fats might be linked to prostate cancer. Still, ALA may not be the culprit; other substances in those foods, such as the hormones and pesticides in meat, might promote tumor growth.

Anyone using flaxseed oil on skin and hair should be aware that there is not enough evidence on the safety of flaxseed oil when applied topically. However, a small study of a topical flaxseed oil gel found it safe and effective for carpal tunnel syndrome.


People who shouldn’t use flaxseed oil include:

  • Pregnant women: It may pose adverse effects on pregnancy, including an increased risk for premature birth.
  • Children: There has not been enough evidence on the safety of flaxseed oil when taken by children, although it is likely safe for children to consume small amounts of flax seeds.
  • Breastfeeding mothers: There isn’t enough reliable information about the safety of flaxseed oil for women who are breastfeeding.
  • People with bleeding disorders: Flaxseed oil may increase the risk of bleeding so anyone with a bleeding disorder should talk to their doctor before using flaxseed oil in food, in supplement form, or as a topical treatment.
  • Surgery: Flaxseed oil should be stopped at least two weeks before surgery and throughout the initial recovery period to prevent bleeding.
  • Persons on blood clotting drugs: Taking flaxseed oil with medications that slow down blood clotting (i.e., aspirin, diclofenac, warfarin, etc.) may increase the risk of bleeding and bruising.

Anyone who is concerned about the effects of flaxseed oil on their prostate should direct their questions to their doctor before adding flaxseed oil to their diet.

Consult your doctor to determine if a flaxseed oil supplement is right for you.

Dosage and Preparations

Flaxseed oil is available as an oil used in food preparation and in gelcap supplements.

There is no standard dosing for flaxseed oil. The recommended dosage varies based on the manufacturer.

Flaxseed oil can be used as a salad oil, in cold sauces, and added to juice, shakes, or smoothies. However, the oil should not be used in recipes that require heating, such as stir-fries or baking. When exposed to heat, the oil can form harmful chemicals.

Flaxseed oil can be applied to the skin or added to your favorite skin cream to increase moisture in the skin and improve skin health. It can also be applied to hair to promote shine and growth. 

What to Look For

You may find flaxseed oil in the refrigerated section of your health food store or on store shelves (some brands add antioxidants to make their products shelf-stable, meaning they don't need refrigeration until opened).

Once opened, all flaxseed oil must be refrigerated. 

Look for cold-pressed oil packaged in an opaque bottle to protect it from the light. The oil should be clear, golden-yellow color. Some oils, known as high-lignan oils, contain particulate of ground flaxseed and may appear to have dirt or grit in it, which is normal.

Fresh flaxseed oil has a mild nutty aroma reminiscent of sunflower or sesame seeds and tastes crisp and mildly nutty. Oil that is cloudy, smells fishy or like fried oil, or has a bitter or burnt flavor is rancid and should not be used. If you notice this or the product is past its expiration date, throw it out.

A Word From Verywell

Flaxseed oil is high in omega-3 fatty acids and other healthful compounds shown to have a variety of health benefits. However, most of the research on this has been on animal models, and studies on humans have been limited.

Be sure to speak with your doctor before using flaxseed oil to ensure that it is appropriate for you.

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  1. Goyal A, Sharma V, Upadhyay N, Gill S, Sihag M. Flax and flaxseed oil: an ancient medicine & modern functional food. J Food Sci Technol. 2014;51(9):1633-53. doi:10.1007/s13197-013-1247-9

  2. Ren GY, Chen CY, Chen GC, et al. Effect of flaxseed intervention on inflammatory marker C-reactive protein: A systematic review and meta-analysis of randomized controlled trials. Nutrients. 2016;8(3):136. doi:10.3390/nu8030136

  3. Okinyo-Owiti DP, Dong Q, Ling B, et al. Evaluating the cytotoxicity of flaxseed orbitides for potential cancer treatment. Toxicol Rep. 2015;2:1014-1018. doi:10.1016/j.toxrep.2015.06.011

  4. Lowcock EC, Cotterchio M, Boucher BA. Consumption of flaxseed, a rich source of lignans, is associated with reduced breast cancer risk. Cancer Causes Control. 2013;24(4):813-6. doi:10.1007/s10552-013-0155-7

  5. Ramos CI, Andrade de Lima AF, Grilli DG, Cuppari L. The short-term effects of olive oil and flaxseed oil for the treatment of constipation in hemodialysis patients. J Ren Nutr. 2015;25(1):50-6. doi:10.1053/j.jrn.2014.07.009

  6. Styrczewska M, Kostyn A, Kulma A, et al. Flax fiber hydrophobic extract inhibits human skin cells inflammation and causes remodeling of extracellular matrix and wound closure activation. Biomed Res Int. 2015;2015:862391. doi:10.1155/2015/862391

  7. Ibrügger S, Kristensen M, Mikkelsen MS, Astrup A. Flaxseed dietary fiber supplements for suppression of appetite and food intake. Appetite. 2012;58(2):490-5. doi:10.1016/j.appet.2011.12.024

  8. Cetisli NE, Saruhan A, Kivcak B. The effects of flaxseed on menopausal symptoms and quality of life. Holist Nurs Pract. 2015;29(3):151-7. doi:10.1097/HNP.0000000000000085

  9. National Center for Complementary and Integrative Health. Flaxseed and flaxseed oil. Updated September 2016.

  10. O'Keefe A, Kapur S, Rex G, Watson W. Flax seed allergy in children: an emerging allergen? Allergy Asthma Clin Immunol. 2010; 6(Suppl 2):P6. doi:10.1186/1710-1492-6-S2-P6

  11. Hackshaw-McGeagh LE, Perry RE, Leach VA, et al. A systematic review of dietary, nutritional, and physical activity interventions for the prevention of prostate cancer progression and mortality. Cancer Causes Control. 2015;26(11):1521-50. doi:10.1007/s10552-015-0659-4

  12. Carleton AJ, Sievenpiper JL, De Souza R, McKeown-Eyssen G, Jenkins DJ. Case-control and prospective studies of dietary α-linolenic acid intake and prostate cancer risk: a meta-analysis. BMJ Open. 2013;3(5). doi:10.1136/bmjopen-2012-002280

  13. Setayesh M, Sadeghifar AR, Nakhaee N, Kamalinejad M, Rezaeizadeh H. A topical gel from flax seed oil compared with hand splint in carpal tunnel syndrome: A randomized clinical trial. J Evid Based Complementary Altern Med. 2017;22(3):462-467. doi:10.1177/2156587216677822

  14. UW Medicine Anesthesiology and Pain Medicine. Medications to avoid before surgery.

  15. Mount Sinai Health Library. Flaxseed oil.

  16. Kajla P, Sharma A, Sood DR. Flaxseed--a potential functional food source. J Food Sci Technol. 2015;52(4):1857-71. doi:10.1007/s13197-014-1293-y

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