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Evidence-Based Supplement Research
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Flax and Reduced Waist Circumference

Research synthesisVery low evidenceSmall effect3 studies · 1 beneficial · 2 neutral · 0 harmful

Across 3 studies, 1 reported a small beneficial effect of flaxseed oil on reducing waist circumference, while 2 found neutral effects. The single beneficial study, an RCT in 60 adults with metabolic syndrome, used 25 mL/day for 49 days and found a statistically significant decrease in waist circumference. The evidence base is very small and preliminary, with median study duration of 49 days.

  • Effective dose range: 25 mL/day
  • Studied populations: people with metabolic syndrome, hemodialysis patients

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The beneficial result came from a single small RCT; the meta-analysis and review both reported neutral or unclear effects.

Generated Jun 11, 2026
Doses used in studies
  • Ground Flaxseed Oil · g/day: 10 (median 10, IQR 10–10) — 1 study
  • mL/day: 25 (median 25, IQR 25–25) — 1 study
Time to effect
Median: 7 weeks · IQR 7 weeks–7 weeks · Range 7 weeks–7 weeks — Reported in 1 of 3 studies
3 of 3 papers
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