Flaxseed
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Evidence Summary
Flaxseed is a nutrient-dense supplement containing lignans and omega-3 fatty acids. Research consistently demonstrates its potential to reduce blood pressure and improve lipid profiles, particularly in individuals with metabolic or cardiovascular risks.
Evidence by Condition
Multiple meta-analyses and RCTs demonstrate that flaxseed supplementation significantly reduces blood pressure (PMID: 26071633, 36622248, 25740909).
Evidence suggests flaxseed can reduce total and LDL cholesterol concentrations, particularly in postmenopausal women (PMID: 18328014).
Studies indicate benefits for endothelial function and cardiovascular risk markers in patients with coronary heart disease (PMID: 37335239, 31190359).
Flaxseed supplementation may improve anthropometric indices and blood pressure in diabetic patients (PMID: 40499336).
Clinical trials have investigated flaxseed for PCOS and prediabetes, but robust evidence is not yet established in the provided studies.
Effective Doses
Specific dose ranges were not provided in the source text, though a dose-response meta-analysis exists (PMID: 36622248).
Key Findings
- Flaxseed supplementation is effective in reducing blood pressure (PMID: 26071633, 36622248).
- Dietary flaxseed can reduce central aortic blood pressure (PMID: 27528063).
- Flaxseed consumption reduces total and LDL cholesterol in postmenopausal women (PMID: 18328014).
- Flaxseed oil supplementation may impact blood pressure and inflammation in healthy and at-risk adults (PMID: 39558500).
Limitations
Much of the high-quality evidence is focused on specific populations, such as postmenopausal women or diabetic patients, and more research is needed to establish standardized dosing for the general population.
Safety & Interactions
No specific contraindications or adverse interactions were noted in the provided research studies.
AI-generated summary from 20 peer-reviewed studies. Not medical advice. Always consult a healthcare provider.
Claims vs. Evidence
| Claim Type | % of Products | Evidence Required | Status |
|---|---|---|---|
| All Other | 98% | Tier D (Unclassified) | ✅ Supported |
| Structure/Function | 70% | Tier C (DSHEA Structure/Function (no pre-approval)) | ✅ Supported |
| Nutrient | 63% | Tier D (Unknown) | ✅ Supported |
| Qualified Health | 1% | Tier B (FDA Qualified Health Claim) | ✅ Supported |
| Approved Health | 0% | Tier A (FDA Approved Health Claim (21 CFR 101.9)) | ⚠️ Unsupported |
| No Claim | 0% | Tier D (No claim on label) | ✅ Supported |
Research by Topic
Research Evidence (20)
**Ursoniu et al., 2016** | Clin Nutr | Meta Analysis Ursoniu Sorin, Sahebkar Amirhossein, ... Banach Maciej. Effects of flaxseed supplements on blood pressure: A systematic review and meta-analysis of controlled clinical trial. Clin Nutr. 2016-Jun;35...
**Musazadeh et al., 2025** | Diabetes Metab Syndr | Meta Analysis Musazadeh Vali, Nezamoleslami Shokufeh, ... Aryaeian Naheed. The effect of flaxseed supplementation on anthropometric indices, blood pressure, and lipid profile in diabetic patients: A...
**Li et al., 2023** | Food Funct | Meta Analysis Li Lingou, Li Hanzhang, ... Yang Mei. Effect of flaxseed supplementation on blood pressure: a systematic review, and dose-response meta-analysis of randomized clinical trials. Food Funct. 2023-Jan-23;1...
**Mahmudiono et al., 2022** | Phytother Res | Meta Analysis Mahmudiono Trias, Jasim Saade Abdalkareem, ... Amraei Mohammad. The effect of flaxseed oil consumtion on blood pressure among patients with metabolic syndrome and related disorders: A system...
**Khalesi et al., 2015** | J Nutr | Meta Analysis Khalesi Saman, Irwin Christopher, Schubert Matt. Flaxseed consumption may reduce blood pressure: a systematic review and meta-analysis of controlled trials. J Nutr. 2015-Apr;145(4):758-65. doi:10.3945...
This study compared the effects of flaxseed and fish oil supplementation on cardiovascular risk parameters in diabetic patients with coronary heart disease. Participants were randomly allocated into three intervention groups to receive either 1,000 m...
**McNabb et al., 2024** | Curr Hypertens Rev | Meta Analysis McNabb Tara B, Young Ian, ... Tou Janet C. Supplementation of Olive Oil and Flaxseed Oil on Blood Pressure and Inflammation in Healthy and At-Risk Adults: A Systematic Literature Review and...
**Caligiuri et al., 2016** | Hypertension | Rct Caligiuri Stephanie P B, Rodriguez-Leyva Delfin, ... Pierce Grant N. Dietary Flaxseed Reduces Central Aortic Blood Pressure Without Cardiac Involvement but Through Changes in Plasma Oxylipins. Hypertens...
Polyunsaturated fatty acids of the n-3 series (n-3 PUFA) exhibit a number of favorable effects on the human organism and it is desirable to increase their intake in the diet. For this purpose, flaxseed oil was added to a chicken-feed mixture for the ...
Lignans are phytochemicals studied extensively as dietary factors in chronic disease etiology. Our goal was to examine associations between the gut microbiota and lignan metabolism and whether these associations differ by ethnicity. We conducted a fl...
**Patade et al., 2008** | J Womens Health (Larchmt) | Rct Patade Anagha, Devareddy Latha, ... Arjmandi Bahram H. Flaxseed reduces total and LDL cholesterol concentrations in Native American postmenopausal women. J Womens Health (Larchmt). 2008-Apr;17...
Background: Clinical studies have demonstrated possible beneficial effects of flaxseed on cardiovascular disease risk factors, but limited studies have evaluated the effects of flaxseed on the plasma lipoprotein-associated phospholipase A2 (Lp-PLA2) ...
OBJECTIVES: A healthy lifestyle, including a healthy diet has been associated with an improvement in cardiovascular risk factors. The aim of the present study was to assess the effect of olive oil and flaxseed consumption as part of a healthy diet on...
**NCT ID**: NCT03713138 **Phase**: NA **Status**: COMPLETED **Enrollment**: 120 **Completion**: 2018-01-01
**NCT ID**: NCT03737422 **Phase**: NA **Status**: COMPLETED **Enrollment**: 48 **Completion**: 2018-12-01
**NCT ID**: NCT00733772 **Phase**: PHASE2 **Status**: COMPLETED **Enrollment**: 189 **Completion**: 2009-12
**NCT ID**: NCT01619020 **Phase**: NA **Status**: COMPLETED **Enrollment**: 66 **Completion**: 2017-08
**NCT ID**: NCT02324439 **Phase**: PHASE1 **Status**: COMPLETED **Enrollment**: 15 **Completion**: 2021-03
**NCT ID**: NCT02395900 **Phase**: PHASE2 **Status**: COMPLETED **Enrollment**: 50 **Completion**: 2015-01
**NCT ID**: NCT02410668 **Phase**: PHASE2 **Status**: COMPLETED **Enrollment**: 50 **Completion**: 2015-01
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Frequently Asked Questions
What is flaxseed and what are its main benefits?
Flaxseed is a nutrient-dense supplement that contains lignans and omega-3 fatty acids. There is strong evidence for its ability to reduce blood pressure and moderate evidence that it can improve cholesterol levels and cardiovascular health markers.
Can flaxseed help lower blood pressure?
Yes, there is strong evidence from multiple studies and meta-analyses demonstrating that flaxseed supplementation can significantly reduce blood pressure. This benefit is particularly noted in individuals with cardiovascular or metabolic risks.
Does flaxseed help with high cholesterol?
There is moderate evidence suggesting that flaxseed can reduce total and LDL cholesterol concentrations. This effect has been specifically observed in postmenopausal women.
Is flaxseed effective for managing diabetes?
There is moderate evidence that flaxseed supplementation may help improve blood pressure and certain body measurements in patients with diabetes. However, more research is needed to fully understand its impact on metabolic syndrome.
Can flaxseed help with PCOS or prediabetes?
Currently, there is insufficient evidence to establish that flaxseed is effective for managing PCOS or prediabetes. While clinical trials have investigated these conditions, robust evidence is not yet available.
Are there any side effects or safety concerns with flaxseed?
No specific contraindications or adverse interactions have been noted in the current research. It is generally considered safe, but you should consult a healthcare provider before starting any new supplement.
Are there any known drug interactions with flaxseed?
There are no documented drug interactions for flaxseed in the available research. However, it is always important to discuss supplement use with your doctor to ensure it is appropriate for your specific health needs.
What is the recommended dose of flaxseed?
Specific effective dose ranges were not provided in the available research studies. While studies exist regarding dose-response, you should consult a medical professional to determine an appropriate amount for your needs.
Answers generated from research evidence. Not medical advice.