Also known as: Linum usitatissimum, Linseed, Flax
Flaxseed (Linum usitatissimum) is one of the richest plant sources of alpha-linolenic acid (ALA) and lignans. Clinical trials demonstrate its benefits for cardiovascular health, blood pressure reduction, and digestive regularity.
Flaxseed (Linum usitatissimum) is a nutritionally dense seed containing three key bioactive components: alpha-linolenic acid (ALA, an omega-3 fatty acid comprising 50–60% of total fatty acids), lignans (secoisolariciresinol diglucoside, SDG, making flaxseed the richest known dietary source), and both soluble and insoluble fiber. The FlaxPAD trial, a landmark randomized controlled trial, demonstrated that 30 g daily ground flaxseed reduced systolic blood pressure by 10 mmHg and diastolic by 7 mmHg in hypertensive patients over 6 months — one of the most potent antihypertensive effects observed from any food. Flaxseed lignans are converted by gut microbiota into enterolactone and enterodiol, which have weak estrogenic and antioxidant properties. ALA provides anti-inflammatory benefits and is partially converted to EPA and DHA, though conversion rates are limited (5–10%). The fiber content supports digestive health, glycemic control, and cholesterol reduction. Ground flaxseed is preferred over whole seeds, as the intact seed coat reduces nutrient bioavailability. Flaxseed oil provides concentrated ALA but lacks the fiber and lignan content of whole ground seed.
The FlaxPAD trial demonstrated that 30 g daily ground flaxseed reduced systolic blood pressure by 10 mmHg and diastolic by 7 mmHg in hypertensive patients — among the strongest dietary antihypertensive effects documented.
Meta-analyses show ground flaxseed reduces total cholesterol and LDL-cholesterol, with effects primarily attributed to its soluble fiber and lignan content binding bile acids and modulating cholesterol metabolism.
Flaxseed contains approximately 27% total dietary fiber (both soluble and insoluble), which increases stool bulk, promotes regular bowel movements, and may relieve constipation symptoms.
Mixed into meals throughout the day; drink plenty of water
Must be ground (not whole seeds) for optimal nutrient absorption. Store ground flaxseed refrigerated to prevent ALA oxidation. Effects on blood pressure appear after 4–6 weeks.
Full spectrum of ALA, lignans, and fiber benefits
Concentrated ALA supplementation
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