Lately, I was found with minor high level of thyroid. I workout and I drink whey protein shakes. So is it safe to take whey in thyroid disorder?

No iodine. The only dietary restriction for most people with mildly high thyroid levels is to avoid excess iodine, typically found in seaweed or kelp. Whey protein is derived from milk products and does not have excess iodine, so it is safe.