Looks like black and red marker lower hemoglobin .
https://www.ncbi.nlm.nih.gov/m/pubmed/27548190/
Black maca and, in smaller proportions, red maca reduced hemoglobin levels only in highlanders with abnormally high hemoglobin levels; neither variety of maca reduced hemoglobin levels in lowlanders.
It says only in hi landers not in low landers but I assume that’s because your average low lander doesn’t have high hemoglobin to begin with.
https://www.ncbi.nlm.nih.gov/m/pubmed/27548190/
Black maca and, in smaller proportions, red maca reduced hemoglobin levels only in highlanders with abnormally high hemoglobin levels; neither variety of maca reduced hemoglobin levels in lowlanders.
It says only in hi landers not in low landers but I assume that’s because your average low lander doesn’t have high hemoglobin to begin with.