Bladderwrack: Research · Nutrient Desk

Traditional use is not a measured weight-loss benefit

EMA found the clinical evidence insufficient: a study in obese postmenopausal women used a combination product and had methodological problems. It could not show that bladderwrack itself caused weight loss. 1

Weight lossToo little evidence

The European indication is based on traditional use rather than convincing trials. 1

Did an extract lower blood sugar after a meal?

In a crossover trial, 38 healthy adults took 500 mg or 2,000 mg of a polyphenol-rich bladderwrack extract before white bread. Neither dose improved the two-hour glucose or insulin response compared with placebo. This tests a single meal in healthy people, not long-term diabetes treatment. 2

MetabolismToo little evidence

The tested extract did not improve glucose or insulin responses to one meal. 2

Where the antioxidant interest comes from

Laboratory studies described by Memorial Sloan Kettering report antioxidant activity and effects on enzymes involved in collagen breakdown. These help explain research interest, but cell findings do not establish that swallowing bladderwrack slows aging or improves skin. 3

Cellular health & agingToo little evidence

The laboratory findings do not establish an anti-aging benefit in people. 3

Effects by health goal

Open an effect to see the studies behind its rating. Bars show the size of the effect; the letter grades the evidence.