herb · for frequent colds
Fernblock
A fern extract taken by mouth, sold for sun protection. Studied mainly for how much UV it takes to burn the skin.
How strong is the research?
Not verified evidence
Studied in a narrower group
1 paper read, 1 supporting.
Tested as: Polypodium leucotomos extract. A 480 mg capsule, twice a day.
Who was studied: Top athletes in heavy training, in Mallorca, Spain. 50 took the extract. 50 others were compared against them.
We found 1 study on this. We have not finished reading them yet, so we are not ready to say either way.
How much to take
960 mg