Secoisolariciresinol – Flaxseed Lignan Explained
Secoisolariciresinol is a plant-based lignan found mainly in flaxseeds, converted in the body into estrogen-like compounds with potential health benefits.
Things worth knowing about "Secoisolariciresinol"
Secoisolariciresinol is a plant-based lignan found mainly in flaxseeds, converted in the body into estrogen-like compounds with potential health benefits.
What Is Secoisolariciresinol?
Secoisolariciresinol (abbreviated SECO) is a naturally occurring lignan – a class of polyphenolic plant compounds found widely in nature. It is present in many plant-based foods, with flaxseeds (linseeds) being by far the richest dietary source. In the human digestive tract, secoisolariciresinol is converted by gut bacteria into the enterolignans enterodiol and enterolactone, which exert weak estrogen-like activity and are therefore classified as phytoestrogens.
Dietary Sources
Secoisolariciresinol is found in a variety of plant foods. The highest concentrations occur in:
- Flaxseeds (by far the richest source, up to 300–800 mg per 100 g)
- Sesame seeds
- Sunflower seeds
- Rye and other whole grains
- Legumes (e.g., lentils, chickpeas)
- Certain vegetables (e.g., broccoli, garlic)
In flaxseeds, secoisolariciresinol is predominantly present in its bound form as secoisolariciresinol diglucoside (SDG), which must be hydrolyzed during digestion before the active compound is released.
Mechanism of Action
After ingestion, secoisolariciresinol diglucoside is first hydrolyzed in the gut to yield free secoisolariciresinol. Gut microbiota then progressively convert it into enterodiol and subsequently enterolactone. These enterolignans:
- bind weakly to estrogen receptors (both α and β subtypes), exerting estrogenic or anti-estrogenic effects depending on the hormonal environment
- act as antioxidants, protecting cells from oxidative damage
- modulate enzymes involved in hormone metabolism (e.g., aromatase)
- demonstrate anti-inflammatory properties in laboratory studies
The rate of conversion to enterolignans varies considerably between individuals and depends largely on the composition of the gut microbiome.
Potential Health Benefits
Hormonal Balance and Menopausal Symptoms
Due to its weak phytoestrogenic activity, secoisolariciresinol has been studied for its potential role in alleviating menopausal symptoms such as hot flashes. Clinical evidence remains inconsistent and further research is needed.
Cardiovascular Health
Several studies suggest that regular intake of flaxseed lignans may favorably affect blood lipid levels (e.g., LDL cholesterol) and blood pressure. These effects are attributed to secoisolariciresinol as well as the fiber and omega-3 fatty acids naturally present in flaxseeds.
Cancer Prevention
Laboratory studies and certain observational studies have explored a potential association between high lignan intake and reduced risk of hormone-dependent cancers, particularly breast cancer and prostate cancer. The evidence is promising but not yet sufficient to support definitive health claims.
Blood Sugar and Metabolic Health
Early data from animal studies and small clinical trials suggest that secoisolariciresinol may positively influence blood glucose levels and insulin sensitivity, which could be relevant to the prevention of type 2 diabetes.
Recommended Intake and Dosage
There is no officially established daily intake for secoisolariciresinol. Studies have typically investigated amounts provided by 2–4 tablespoons of ground flaxseeds per day (equivalent to approximately 40–100 mg of SDG). As a dietary supplement, secoisolariciresinol is most commonly available as an SDG extract from flaxseeds.
Safety and Interactions
Secoisolariciresinol is considered safe when consumed through regular food sources. The following considerations apply when using supplements at higher doses:
- Individuals with hormone-sensitive conditions (e.g., estrogen-receptor-positive breast cancer) should consult a healthcare professional before taking higher-dose supplements.
- Potential interactions with hormone therapies or anticoagulants (e.g., warfarin) cannot be excluded.
- Use of concentrated supplements during pregnancy and breastfeeding is generally not recommended.
- An altered gut microbiome may impair the conversion of secoisolariciresinol into active enterolignans.
References
- Adolphe, J. L., Whiting, S. J., Juurlink, B. H., Thorpe, L. U., & Alcorn, J. (2010). Health effects with consumption of the flax lignan secoisolariciresinol diglucoside. British Journal of Nutrition, 103(7), 929–938.
- Pan, A., Sun, J., Chen, Y., Ye, X., Li, H., Yu, Z., ... & Lin, X. (2007). Effects of a flaxseed-derived lignan supplement in type 2 diabetic patients: a randomized, double-blind, cross-over trial. PLoS ONE, 2(11), e1148.
- Flower, G., Fritz, H., Balneaves, L. G., Verma, S., Skidmore, B., Fernandes, R., ... & Seely, D. (2014). Flax and breast cancer: a systematic review. Integrative Cancer Therapies, 13(3), 181–192.
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