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ingestible · for menopause support

Flaxseed Lignans

Reviewed by the Nimbera editorial team · Last updated May 2026

Cosentino et al. 2011 RCT (Gynecol Endocrinol, PMID 21900849) - 140 postmenopausal women taking 25 g/day ground flaxseed for 3 months showed significant reductions in hot flash frequency and Kupperman menopausal index scores. Evidence consistent but fewer large RCTs vs other phytoestrogen approaches.$5-$10/month for ground flaxseed.

How to use

Take 25-40 g/day of freshly ground flaxseed (flax meal) added to yoghurt, smoothies, oatmeal, or baked goods. Ground flaxseed is far superior to whole seeds (hull prevents digestion). Store ground flaxseed in the refrigerator and grind fresh for best results. Benefits are from SDG lignans (converted by gut bacteria to enterolignans) not ALA omega-3.

How it works

Secoisolariciresinol diglucoside (SDG) in flaxseed is converted by colonic bacteria to enterodiol and enterolactone - mammalian lignans that bind weakly to estrogen receptors (phytoestrogens). These also have antioxidant activity and may modulate sex hormone-binding globulin, potentially improving the free-to-bound estrogen ratio during menopause.

Where to buy

Bob's Red Mill Organic Flaxseed Meal ($5-$8/16 oz), Spectrum Essentials Ground Flaxseed ($6-$10/14 oz), whole golden flaxseeds ($4-$8/lb) for grinding fresh - available at grocery stores, health food stores, and online.

Typical cost: $5-$10/month for ground flaxseed.

Safety notes

Generally very safe as a food. At high doses (>50 g/day) can impair thyroid iodine uptake - avoid very large amounts in hypothyroidism. Ground flaxseed should be refrigerated to prevent rancidity (rancid flaxseed is pro-oxidant). Increase water intake when adding flaxseed to diet (absorbs water). Start with smaller amounts (1 tsp) and increase gradually to avoid bloating.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Cosentino et al. 2011 - Gynecol Endocrinol (PMID 21900849)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.