Linum usitatissimum · Seed
Flaxseed
Studied in peopleFlax gave humanity linen cloth and nourishing seeds. The Bible mentions flax drying on Rahab's roof, and it remains a humble, fiber-rich food today.
Traditionally used for
- Traditionally used as a gentle food to support regularity
- Seed poultices used in old European folk practice
What research says
NCCIH notes that ground flaxseed contains soluble fiber and may help with constipation, and studies have looked at its effects on cholesterol and blood sugar with mixed results.
How people use it
- Grind fresh and stir into oatmeal, smoothies and yogurt
- Use 1 tbsp ground flax + 3 tbsp water as an egg replacer
- Store ground flax in the refrigerator
Safety and interactions
- Drink plenty of water with flaxseed
- Flaxseed may affect absorption of oral medicines; take them at different times
- Avoid raw or unripe flaxseed
Always talk with your doctor or pharmacist before using flaxseed as a supplement, especially with prescription medicine, in pregnancy or before surgery.
Sources
Reviewed October 25, 2026. Evidence tier: Studied in people: Human studies summarized by NIH NCCIH suggest a possible benefit for a specific use. How we rank evidence.