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A daily dosage of 2.4-8 mg fucoxanthin has shown benefit in some human studies over a prolonged period of time, and while within this range the benefits are dose-dependent higher doses have not been tested sufficiently.
If buying a seaweed standardized for fucoxanthin, look for the extract percentage and then backtrack. Buying an undaria pinnafitida supplement that is 1% fucoxanthin by weight would require 240-800 mg of the supplement to get 2.4-8 mg fucoxanthin. *
Because fucoxanthin is not approved by the FDA for any condition, there is no official dose. Users and supplement manufacturers have established unofficial doses based on trial and error. Discuss with your doctor if fucoxanthin may be useful as a complementary approach in your case and which dose you should take.
The only human trial carried out tested a dose of 0.8-4.0 mg fucoxanthin combined with pomegranate seed oil. *