# HMRlignans (Norway spruce extract)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/hmrlignans
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-30
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** 7-hydroxymatairesinol, HMR extract, Norway spruce lignan extract, Picea abies extract, 7-HMR co-crystal, Hydroxymatairesinol potassium acetate, Spruce knot extract

## Overview

HMRlignan is a purified plant lignan derived from Norway spruce (Picea abies) knots, with 7-hydroxymatairesinol (HMR) as its primary bioactive compound. HMR is converted by gut microbiota into enterolactone, a mammalian lignan that modulates estrogen receptor signaling and may support hormone balance.

## Health Benefits

• Anticancer properties: Preclinical studies in rats showed HMR reduced induced tumor volume, stabilized established tumors, and prevented new tumor formation (animal evidence only)
• Immunomodulation: In vitro studies on THP-1 monocytes and human PMNs demonstrated [immunomodulatory](/ingredients/condition/immune-support) activity (PMID: 20005303, cell culture evidence)
• [Antioxidant](/ingredients/condition/antioxidant) effects: Exhibits antioxidant properties in preclinical models (preliminary evidence)
• Hormone balance: Functions as a weak phytoestrogen with protective rather than stimulatory effects (mechanistic evidence only)
• Potential cardiovascular support: May help lower [LDL cholesterol](/ingredients/condition/heart-health) based on mechanism of action studies (theoretical benefit)

## Mechanism of Action

HMRlignan's primary bioactive, 7-hydroxymatairesinol (HMR), is metabolized by intestinal bacteria—particularly Clostridium scindens and related species—into enterolactone, a phytoestrogen that competes with endogenous estradiol at estrogen receptor alpha (ERα) and beta (ERβ), with preferential affinity for ERβ. Enterolactone also inhibits aromatase (CYP19A1) activity, reducing local estrogen biosynthesis in peripheral tissues. Additionally, HMR and its metabolites modulate NF-κB signaling pathways, suppressing [pro-inflammatory cytokine](/ingredients/condition/inflammation) production including TNF-α and IL-6 in monocyte and neutrophil cell lines.

## Clinical Summary

Preclinical rodent studies demonstrated that oral HMR administration reduced chemically-induced mammary tumor volume, stabilized established tumors, and inhibited new tumor formation, though these findings have not been replicated in human clinical trials. In vitro studies using THP-1 monocytes and human polymorphonuclear neutrophils (PMNs) confirmed [immunomodulatory](/ingredients/condition/immune-support) activity at the cellular level. Human pharmacokinetic studies have established that dietary HMR reliably elevates serum enterolactone concentrations, with bioavailability dependent on [gut microbiome](/ingredients/condition/gut-health) composition. Overall, the current evidence base is preliminary—dominated by animal and cell culture data—and robust randomized controlled trials in humans are lacking.

## Nutritional Profile

{"macronutrients": {"fiber": "Not specified", "protein": "Not specified"}, "micronutrients": {"vitamins": "Not specified", "minerals": "Not specified"}, "bioactive_compounds": {"HMR lignans": "Concentration not specified"}, "bioavailability_notes": "Bioavailability of HMR lignans in humans is not well-documented; most evidence is from animal and in vitro studies."}

## Dosage & Preparation

No clinically studied human dosage ranges are detailed in the available research. Commercial forms include off-white crystalline powder or capsules/softgels, standardized to NLT 90% 7-HMR co-crystal with potassium acetate. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

HMRlignan is generally considered well tolerated at studied doses (50–150 mg/day), with no significant adverse effects reported in short-term human pharmacokinetic studies. Due to its estrogenic and anti-estrogenic activity via ERα and ERβ modulation, HMRlignan should be used with caution in individuals with hormone-sensitive conditions such as estrogen receptor-positive breast cancer, uterine fibroids, or endometriosis. Potential interactions exist with tamoxifen, aromatase inhibitors, and other hormone therapies, as the combined estrogenic modulation could alter therapeutic outcomes unpredictably. Safety data during pregnancy and lactation are insufficient, and use is not recommended in these populations.

## Scientific Research

Limited human clinical trials are available, with most evidence stemming from preclinical studies. One rat study showed antitumor effects including reduced tumor volume and prevention of new tumors, while in vitro research demonstrated [immunomodulatory](/ingredients/condition/immune-support) activity in human monocytes and PMNs (PMID: 20005303). No meta-analyses or large-scale human RCTs were identified in the available research.

## Historical & Cultural Context

Isolated HMRlignan lacks historical traditional use, as it is a modern nutraceutical discovered in the 1990s-2000s from Norway spruce knots. While HMR itself is newly isolated, lignan-rich plants like flaxseed, sesame, and whole grains have been part of traditional diets across cultures for reproductive health, digestive balance, and [cardiovascular](/ingredients/condition/heart-health) wellness.

## Synergistic Combinations

[Probiotic](/ingredients/condition/gut-health)s, Green tea extract, Vitamin D3, DIM (diindolylmethane), Calcium D-glucarate

## Frequently Asked Questions

### What is HMRlignan and where does it come from?

HMRlignan is a standardized extract of 7-hydroxymatairesinol (HMR), a plant lignan concentrated in the knots of Norway spruce trees (Picea abies). The knot wood contains exceptionally high lignan content compared to other plant sources, making it a commercially viable raw material for producing purified HMR supplements used for hormone balance support.

### How does HMRlignan affect estrogen levels in the body?

HMRlignan is not directly estrogenic; rather, gut bacteria convert its active compound HMR into enterolactone, which binds preferentially to estrogen receptor beta (ERβ) and weakly competes with estradiol at ERα. Enterolactone also inhibits aromatase (CYP19A1), the enzyme responsible for converting androgens into estrogens in peripheral tissues, potentially lowering local estrogen production. This dual mechanism can produce either mildly estrogenic or anti-estrogenic effects depending on the individual's baseline hormonal environment.

### What is the recommended dosage of HMRlignan?

Human pharmacokinetic studies have primarily used doses ranging from 50 mg to 150 mg of HMR per day to assess enterolactone conversion and bioavailability. Commercial HMRlignan supplements commonly provide 50 mg per serving, often standardized to ≥90% 7-hydroxymatairesinol. No official recommended daily intake has been established, and optimal therapeutic dosing for specific health outcomes has not been confirmed in large-scale clinical trials.

### Can HMRlignan help prevent breast cancer?

Animal studies showed that HMR reduced dimethylbenz[a]anthracene (DMBA)-induced mammary tumor volume in rats, stabilized existing tumors, and inhibited new tumor formation, suggesting a potential chemopreventive role. However, these are preclinical findings only, and no human randomized controlled trials have confirmed breast cancer prevention efficacy for HMRlignan or its metabolite enterolactone. Individuals with hormone-sensitive breast cancer or those on aromatase inhibitors or tamoxifen should consult an oncologist before using HMRlignan.

### Does gut health affect how well HMRlignan works?

Yes, significantly—the conversion of HMR into the active metabolite enterolactone depends almost entirely on specific gut bacteria, including species such as Clostridium scindens and other anaerobic intestinal microflora. Individuals with dysbiosis, those who have recently taken antibiotics, or people with altered gut microbiome composition may produce substantially lower serum enterolactone levels from the same HMR dose. This inter-individual variability in microbial metabolism means that blood enterolactone concentrations, not just HMR intake, are a more meaningful indicator of biological activity.

### What does the research evidence show about HMRlignan's effectiveness in humans versus animals?

Current evidence for HMRlignan is primarily limited to preclinical studies in animals and cell cultures, which cannot be directly translated to human outcomes. While rat studies showed promise for tumor reduction and prevention, and in vitro studies demonstrated immunomodulatory activity in human immune cells, clinical trials in humans are needed to establish efficacy and safety. The gap between promising laboratory results and proven human benefits is significant and important to understand when considering supplementation.

### Is HMRlignan safe to take with common medications or supplements?

Limited clinical data exists on HMRlignan's interactions with medications or other supplements due to the ingredient's relatively sparse human research. Because HMRlignan has immunomodulatory properties and may affect estrogen metabolism, individuals taking immunosuppressants, hormone-sensitive medications, or tamoxifen should consult a healthcare provider before use. It is advisable to inform your doctor about HMRlignan supplementation, particularly if you are on prescription medications or managing cancer-related conditions.

### Who is most likely to benefit from HMRlignan supplementation based on current research?

Given that evidence is primarily preclinical, there is no clearly defined population shown to benefit from HMRlignan in human studies. Theoretical candidates might include individuals interested in antioxidant and immunomodulatory support, though actual benefit remains unproven in humans. Anyone considering HMRlignan for disease prevention or management should discuss this with their healthcare provider, as clinical evidence in specific populations is currently insufficient.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*