I have been eating sea salt for 5-6 months and just recently, after stopping everything I eat/cutting out all processed foods, and STILL had allergic reactions, figured out it was the sea salt that was causing my allergic reactions. From what I read there are anti-caking agents to keep the salts separated, as well as sand and shellfish traces.
I was breaking out in hives on my legs, arms, chest - only part of the time - but mainly was having a reaction on my "lower" lips - I guess when you urinate the salt/additives in the salt were touching the area and bothering the skin down there. Went to 2 girl doctors to no avail - they couldn't find anything and never thought to go to an allergy, but quick to prescribe antibiotics and Y.I. creams/pills.
Now that I am not putting sea salt on basically everything I eat, my allergic reactions have gone away. It's been just over a week - I think there may be traces of the salts in my sweat glands, as now that I can exercise again (first time last night), I'm getting a minor reaction to the excretion process from the salts. All I can do is take Benedryl until it's all out.
Let me tell you, I can't wait for it to be all out of my body. 6 months of pain and allergic reactions is enough to make you cry, scream, be angry, and certainly isn't healthy for your relationship!