would it be dangerous to take herbal supplements like selenium and iodine while !

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The answer depends on which all dietary supplements, but your best (and safest) bet would be to ask a pharmacist if there are any interactions listed between the drugs and supplements you'd like to take. Doctors and pharmacists both have access to a database of drug and supplement interactions and they can tell you quickly if you can safely take them together or not.... anyone here will just have a best guess from searching on the internet (which isn't always accurate, as we all know) ;-)
I don't personally imagine it would be an issue for those two as those are required nutrients, but I don't have access to that database so I couldn't verify. Good luck and I hope I helped!

Personal research in my role as a Product Specialist for a vitamin company and I get asked similar questions quite often

i looked up levothyroxine in my book about pills. it said that there would be no interaction between the supplements you mentioned and the above listed med. it did say it should be taken preferably before breakfast. i hope this helped

THE PILL BOOK NEW AND REVISED 9TH EDITION