If you have the MTHFR gene mutations iodine researchers recommend testing selenium levels using an RBC Selenium test prior to supplementing selenium.

Those with MTHFR gene mutations tend to recycle selenium much more efficiently than those who do not have the MTHFR gene mutations. This recycling can cause elevated selenium levels, sometimes very elevated, well over 1,000 as it relates to the lab ranges.

 

If you have the MTHFR gene mutations, iodine researchers recommend testing selenium levels using a RBC Selenium Test prior to supplementing selenium.

 

For those that test high in selenium the iodine researchers recommend not supplementing as long as your test levels remain in the upper end of the range.