Research synthesisModerate evidenceSmall effect5 studies · 3 beneficial · 2 neutral · 0 harmful
Across 5 studies, 3 reported beneficial effects of flaxseed supplementation on reducing low-density lipoprotein (LDL) cholesterol, with effect sizes ranging from small to moderate. The median study duration was 70 days, suggesting effects typically observed at 8-12 weeks. The most studied population includes clinical groups such as patients with type 2 diabetes, postmenopausal women, and those with dyslipidemia, though doses varied and were not consistently reported.
- Effective dose range: 28-30 g/day
- Studied populations: patients with type 2 diabetes, postmenopausal women, patients with dyslipidemia
Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The highest-quality study (evidence score 7) found a neutral effect, which tempers confidence in the overall benefit.
Generated Jul 11, 2026