Flaxseed (Linum usitatissimum)
Overview
Flaxseed (Linum usitatissimum), also called linseed, is a slender annual plant growing up to about 3 ft (1 m). It produces narrow leaves, delicate blue flowers, and spherical seed capsules containing shiny, flat seeds. Long cultivated in the Middle East and beyond, flaxseeds are rich in beneficial fatty acids (particularly alpha-linolenic acid), protein, fiber, mucilage, and lignans (phytoestrogens). These constituents make flaxseed valuable for heart health, inflammatory conditions, and supporting estrogen balance.
Traditional uses & properties
Bulk Laxative & Gut Healer: The seeds’ mucilage content softens stools and reduces gut inflammation in conditions such as IBS or colitis. Phytoestrogenic: Lignans may help prevent estrogen-dependent cancers and can ease menopausal symptoms. Omega-3–Rich: High in alpha-linolenic acid, which supports cardiovascular health, helps lower LDL cholesterol, and reduces inflammation. External Applications: Crushed seed poultices soothe boils, carbuncles, and other skin irritations.
Preparations & dosage
Take 1–2 tsp of the seeds with a large glass of water each day or soak them in cold water overnight before taking.
Safety & precautions
Oxidation: Ground flaxseeds spoil quickly due to oxidation. Grinding fresh seeds as needed is best. Immature Seeds: Avoid consuming unripe seeds—they may be toxic. Storage: Ground or cracked seeds should be kept in an airtight container in the fridge.
Drug & food interactions
Flaxseed lignan supplementation appears to have no significant effect on blood-glucose levels in type 2 diabetic patients also taking oral antidiabetic drugs (not named). Limited evidence suggests that flaxseed oil may increase bleeding times and therefore some caution might therefore be appropriate with aspirin and anticoagulants.
No interactions found.
Limited evidence suggests that flaxseed oil may have some antiplatelet effects, which could be additive with those of conventional antiplatelet drugs, and increase the risk of bleeding with anticoagulants. nosebleeds) in patients taking aspirin and flaxseed oil, one of whom was taking low-dose aspirin.1 Some studies have investigated the effect of flaxseed oil alone on bleeding time, and one, in 10 healthy subjects, found that a flaxseed oil rich diet (20.5 g daily of α-linolenic acid) for 56 days had no significant effect on bleeding times, prothrombin times or partial prothrombin times.2 However, another study in 11 patients with rheumatoid arthritis reported that flaxseed oil 30 g daily for 3 months (9.6 g daily of α-linolenic acid) increased the bleeding time by about one minute when compared with baseline, although this result was not statistically significant.
Flaxseed lignan supplementation appears to have no significant effect on blood-glucose levels in type 2 diabetic patients also taking oral antidiabetic drugs. In a randomised, crossover study in 68 patients with type 2 diabetes and mild hypercholesterolaemia, taking a supplement containing a total of 360mg of flaxseed lignan daily for 12 weeks had no significant effect on blood-lipid profile, insulin resistance, fasting glucose and insulin concentrations. A minor reduction of glycosylated haemoglobin (HbA1c) of about 0.1% occurred, although the clinical significance of this reduction is likely to be minimal. In this particular study, patients continued to take their usual medication, which included oral antidiabetics and lipid-lowering medications, none of which was specifically named in the study. Patients were excluded from the study if they were using insulin.1 Similarly, in another study, flaxseed oil (60 mg/kg α-linolenic acid daily) had no significant effect on blood-glucose control in type 2 diabetics. Patients taking insulin were also excluded from this study; however, information on other concurrent medication was not reported.2 In another study in 25 menopausal women with hypercholesterolaemia, there was a slight 5.3% reduction in blood-glucose levels (0.1 mmol/L) with crushed flaxseed, and this was less than that seen with conventional HRT,3 which is not considered to have blood-glucose-lowering effects.
No interactions found.
Habitat
Originally from temperate regions in Europe and Asia, flax is now widely cultivated globally, including in Canada, the U.S., Argentina, and northern Europe. Sown in spring, it is harvested in late summer or early fall once seeds have ripened.
Traditionally used for
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