Across 43 first-hand reports, people mentioned a side effect 5 times (about 12 per 100 reports). The most common: fatigue, vivid dreams, slowed nail. User reports show what people notice — they can't tell you whether Ecklonia Cava is safe for you.
“I take 1 to 2 capsules at night which helps with sleep quality and helps me to feel relaxed before bed.”
“Anecdotally I notice a reduction in libido and pleasure from EC, Reishi causes me anxiety and low mood the next day.”
“The ecklonia cava knocks me out and gives me crazy dreams consistently.”
“I also don't seem to get anything from Eklonia Cava. Daytime or Nighttime. Except my fingernail growth seems to have slowed.”
Conclusion: Further randomized-controlled trials should investigate polyphenols from Ecklonia cava and other macroalgal sources, to determine if there is a role for marine polyphenols in reducing the risk factors of chronic disease in humans. (PROSPERO registration number CRD42015016890).