Flaxseed (Linum usitatissimum): Properties and Benefits

Linum usitatissimum L. / Flaxseed, commonly known as flax or flaxseed, is an annual herbaceous plant of the Linaceae family, cultivated for millennia for its versatility. Native to northern Europe and Asia, it has spread globally thanks to its seeds, which are rich in nutrients and fiber. Flaxseed is valued in traditional medicine for its laxative, emollient, and anti-inflammatory properties, and it is used in a wide range of preparations.

This plant has long been a staple in both food and folk medicine, with historical records dating back to ancient civilizations. Its small, oval seeds are the most widely used part, employed in cooking as well as in infusions and extracts. The plant’s richness in omega-3 fatty acids, lignans, and fiber gives flaxseed a robust phytochemical profile, one that modern scientific studies have confirmed in relation to many of its traditional uses.

Popular and International Names of Flaxseed

• English: flax, common flax, linseed, flaxseed.
• Spanish: lino, linaza.
• Portuguese: linhaça, linho.
• French: lin, lin cultivé.
• Italian: lino, lino comune.
• German: lein, gemeiner lein.

Botanical Synonyms of Linum usitatissimum

Linum crepitans (Boenn.) Dumort., Linum humile Mill., Linum indehiscens (J.F.Gmel.) S.F.Gray, Linum angustifolium subsp. usitatissimum (L.) Rouy. These synonyms reflect the taxonomic complexity the species has accumulated throughout botanical history. Although Linum usitatissimum L. remains the most widely accepted name, these designations still appear across a range of scientific and historical literature.

Botanical Family: Linaceae

The Linaceae family comprises around 10 genera and approximately 250 species, distributed mainly across temperate and subtropical regions. It is characterized by herbaceous or shrubby plants with simple leaves and generally five-petaled flowers. The genus Linum is its most representative member, with Linum usitatissimum standing out as the species of greatest economic and medicinal importance.

Plants in the Linaceae family are known for producing high-quality textile fibers and oils rich in essential fatty acids. Flaxseed, in particular, stands out for its unique phytochemical composition, which includes lignans and mucilage. This chemical diversity contributes to the plant’s recognized therapeutic properties, making it an ongoing subject of study in pharmacology and nutrition.

Parts Used of Flaxseed

• Flaxseed Oil
• Seeds (Whole or Ground)

Ethnobotanical and Traditional Uses

• Abdominal Pain
• Colds and Cough
• Constipation
• Demulcent and Emollient
• Intestinal Colic Relief
• Kidney and Gallbladder Stones
• Natural Laxative
• Skin Inflammation (Poultices)
• Sore Throat
• Tonsillitis

Therapeutic Properties of Flaxseed

• Antibacterial (studied activity against bacteria)
• Antidiabetic (studied effect on blood sugar)
• Antidiarrheal (traditional use in relieving diarrhea)
• Anti-inflammatory (studied effect in reducing inflammation)
• Antimicrobial (studied activity against microorganisms)
• Anti-obesity (supports weight management)
• Antioxidant (studied activity against free radicals)
• Antiosteoporotic (contributes to bone health)
• Antiproliferative (observed in laboratory studies, without clinical proof)
• Antiulcer (studied protective effect against ulcers)
• Antiviral (studied activity against viruses)
• Cardioprotective (studied protective effect on the heart)
• Hepatoprotective (studied protective effect on the liver)
• Hypocholesterolemic (studied effect in reducing cholesterol)
• Hypoglycemic (studied effect in lowering blood sugar)
• Immunomodulatory (studied effect on the immune system)
• Laxative (supports intestinal transit)
• Neuroprotective (studied protective effect on the nervous system)
• Renoprotective (studied protective effect on the kidneys)

Detailed Phytochemical Profile of Flaxseed

• Dietary Fiber (Soluble and Insoluble)
• Flavonoids
• Lignans (Secoisolariciresinol Diglucoside – SDG)
• Minerals (Copper, Magnesium, Manganese, Phosphorus, Selenium)
• Mucilage
• Omega-3 Fatty Acids (Alpha-linolenic Acid – ALA)
• Phenolic Acids (Caffeic Acid, p-Coumaric Acid, Ferulic Acid)
• Phytosterols
• Proteins
• Vitamins (B1, B2, C, E, F)

Preparation and Administration Forms of Flaxseed

• Extracts
• Flaxseed Gel
• Flaxseed Oil
• Infusion/Tea
• Poultices
• Seeds (Whole or Ground)
• Tinctures

Synergy with Other Medicinal Plants

Digestive Health

Flaxseed can be combined with other fiber- and mucilage-rich plants, such as psyllium (Plantago ovata), to enhance its laxative effects. This combination can traditionally support relief from chronic constipation, promoting regular and healthy intestinal transit. Soluble and insoluble fibers work in a complementary way, increasing stool bulk and easing evacuation.

Cholesterol Control

Pairing flaxseed with garlic (Allium sativum) or oats (Avena sativa) may optimize the reduction of cholesterol levels. The ALA in flaxseed together with garlic’s sulfur compounds, or the beta-glucans in oats, work in tandem to improve the lipid profile. This synergy is traditionally regarded as supportive in the prevention of cardiovascular disease, offering a natural and complementary approach.

Hormonal Support

For hormonal support, especially in women going through menopause, flaxseed may be paired with red clover (Trifolium pratense) or black cohosh (Actaea racemosa). The lignans in flaxseed, which act as phytoestrogens, work alongside the isoflavones found in these plants. This combination is traditionally used to help ease symptoms such as hot flashes and hormonal imbalances, offering natural relief.

Recipes and Usage Protocols of Flaxseed

Flaxseed Infusion for Constipation

Ingredients:

• 1 tablespoon of whole flaxseeds
• 250 ml of boiling water

Preparation Method:

1. Place the flaxseeds in a cup.
2. Pour the boiling water over the seeds.
3. Cover and let steep for 15 to 20 minutes.
4. Strain and drink warm.

Dosage: Drink 1 to 2 times a day, preferably in the evening, to support intestinal transit. Adequate water intake throughout the day is essential.

Flaxseed Gel for Topical Use

Ingredients:

• 2 tablespoons of whole flaxseeds
• 200 ml of water

Preparation Method:

1. Boil the flaxseeds in the water for about 10 minutes, or until a gel forms.
2. Strain the gel, separating out the seeds.
3. Let it cool before use.

Dosage: Apply the gel directly to irritated or inflamed skin, such as in cases of mild burns or dermatitis. It can be used 2 to 3 times a day.

The preparations above follow traditional records and do not replace professional guidance. Before any internal use, check the contraindications and interactions described in this article.

Associated Therapies

Phytotherapy

In phytotherapy, flaxseed is widely used for its nutritional and medicinal properties. It is employed in several forms, such as ground seeds, oil, and extracts, for traditional support in cases of constipation, dyslipidemia, and hormonal imbalances. Its richness in fiber, omega-3, and lignans makes it a valuable resource for digestive and cardiovascular health.

Functional Nutrition

Flaxseed is a prominent functional food in nutrition, recognized for its health benefits. It is frequently included in diets to support intestinal, cardiovascular, and hormonal health. Its versatility allows it to be incorporated into a wide range of recipes, from smoothies to baked goods, enriching the diet with essential nutrients.

Contraindications and Side Effects of Flaxseed

Flaxseed is generally safe when consumed in appropriate amounts. However, certain contraindications and side effects should be taken into account to ensure safe and mindful use. It is important to be aware of possible interactions and conditions that call for caution when incorporating flaxseed into the diet or into therapeutic use.

Common Side Effects

• Gastrointestinal disturbances: Excessive consumption of flaxseed, especially without adequate hydration, can cause bloating, gas, diarrhea, or constipation. Gradual intake and increased water consumption are recommended.
• Allergic reactions: Although rare, some people may experience allergic reactions to flaxseed, manifesting as skin rashes, itching, or difficulty breathing.

Drug Interactions

• Anticoagulants: Due to its omega-3 content, flaxseed may have a mild anticoagulant effect, potentiating the action of medications such as warfarin. Monitoring is advisable.
• Diabetes medications: Flaxseed can lower blood sugar levels, which may require dosage adjustment of antidiabetic medications to avoid hypoglycemia.
• Oral medications: The fiber and mucilage in flaxseed can interfere with the absorption of other medications if taken at the same time. An interval of 1 to 2 hours is recommended.

Specific Contraindications

• Intestinal obstruction: People with intestinal obstruction should avoid consuming flaxseed due to its high fiber content, which can worsen the condition.
• Pregnancy and breastfeeding: Although there is no conclusive evidence of harm, use of large amounts during pregnancy and breastfeeding should be done under medical guidance.
• Surgery: Due to its potential anticoagulant effect, flaxseed consumption should be discontinued before surgery.

Curiosities and Historical Facts of Flaxseed

The Origin of the Name

The scientific name Linum usitatissimum comes from Latin, where Linum means “thread” or “line,” and usitatissimum means “the most useful.” This name reflects the plant’s long history as a source of fiber for textiles and as a food. Its usefulness was recognized by numerous ancient civilizations, which cultivated it extensively.

Flax in Antiquity

Flax is one of the oldest cultivated crops in the world, with evidence of cultivation dating back more than 7,000 years in Mesopotamia and Ancient Egypt. The Egyptians used flax for mummification and for making light, durable garments. In ancient Greece and Rome, Hippocrates, the father of medicine, already recommended flaxseed for digestive problems, demonstrating its therapeutic value since time immemorial.

Flaxseed and the Textile Industry

For centuries, flax was the leading textile fiber in Europe, before cotton became widespread. Its strength and durability made it ideal for producing clothing, ship sails, and even paper. The flax industry played a crucial role in the economic development of many regions, particularly Ireland and Scotland, where fine linen production was considered an art.

Modern Superfood

In modern times, flaxseed has earned the status of a superfood thanks to its nutritional richness. The discovery of its high levels of omega-3 fatty acids, lignans, and dietary fiber drove its popularity as a dietary supplement. It is widely used in healthy diets and in the prevention of chronic disease, cementing its place as a plant of great importance to human health.

Frequently Asked Questions about Flaxseed Tea

What Is Flaxseed Tea and What Is It Used For?

Flaxseed tea is an infusion prepared from the seeds of Linum usitatissimum. It is traditionally used as a natural laxative, to relieve constipation and support digestive health. It may also have anti-inflammatory and cardioprotective effects due to the presence of omega-3 and lignans. It is a mild beverage that is beneficial for overall well-being.

How Do You Properly Prepare Flaxseed Tea?

To prepare flaxseed tea, add one tablespoon of whole flaxseeds to 250 ml of boiling water. Let it steep for 15 to 20 minutes, strain, and drink warm. If you prefer, you can use ground seeds, mixing them with hot water and letting the mixture sit until it forms a gel. Grinding the seeds makes it easier to extract the nutrients.

Does Flaxseed Tea Have Any Contraindications?

Yes, although generally safe, flaxseed tea does have some contraindications. It is not recommended for people with intestinal obstruction. Pregnant or breastfeeding women should consult a doctor before consuming it. It may interact with anticoagulant and diabetes medications, so an interval of 1 to 2 hours between drinking the tea and taking other medications is advisable. Excessive consumption can cause gastrointestinal disturbances.

What Is the Difference Between Golden and Brown Flaxseed?

Golden and brown flaxseed are varieties of the same species, Linum usitatissimum, and have very similar nutritional profiles. The main difference lies in the color of the hull and, at times, a slightly milder flavor in the golden variety. Both are rich in omega-3, lignans, and fiber, offering the same health benefits. The choice between them generally comes down to personal preference or availability.

Can I Drink Flaxseed Tea Every Day?

Yes, flaxseed tea can be consumed daily, as long as it is in moderate amounts and with adequate hydration. It is important to start with small doses and observe how the body responds, especially given its laxative effect. Regular intake can help maintain digestive and cardiovascular health. Consult a healthcare professional for personalized guidance.