The Claim
Total selenium concentrations in Amazonian soils under Brazil nut trees range from less than 65.76 to 625.91 μg/kg, with the highest levels found in Amazonas state, and all values remain below toxic thresholds for plants.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Soils under Brazil nut trees in the Amazon contain selenium levels between 65.76 and 625.91 micrograms per kilogram, with the highest concentrations in Amazonas state, and none of these levels are high enough to harm plants.
See the scientific wording
Total selenium concentrations in Amazonian soils under Brazil nut trees range from less than 65.76 to 625.91 μg/kg, with the highest levels found in Amazonas state, and all values remain below toxic thresholds for plants.
Brazil nut trees absorb selenium from the soil through their roots, store it in their tissues without harm, and naturally limit how much accumulates to avoid poisoning themselves.
What the research says
1 studyStudy: Natural variation of selenium in Brazil nuts and soils from the Amazon region.
The study found that the soil under Brazil nut trees in the Amazon has a wide range of selenium — from very low to very high — but the trees grow fine, meaning the selenium isn’t poisoning them.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.