My Doctor was always checking my blood vitamins an minerals levels, and they always seemed to be OK. I still picked up a multivitamin on the Doctor's recommendation, it happened to be glutton free too.
I only learned about cross contamination after the first week or two of going gluten free. After that I look for product specifically say Gluten Free...
For starters I've ultimately felt like garbage for nearly ten years. I was a runner who was putting in 50 to 70 miles a week and that abruptly stopped in 2011... Doctors said I was either fine or I had "what was going around." That continued to be the trend for years. If I asked what's wrong with me they assured me I'm on of the healthiest patients the see...