I didn't realize that. I was briefly thought to have hemochromatosis, and had been "self-treating" via the Red Cross for years.

It turns out I didn't have hemochromatosis. It was merely a bit high, but knowing that I donated so often (both whole blood and platelets, which you can do more often), there was concern that the "self-treatment" was covering up a real problem.

I had not heard at the time that they wouldn't have wanted my blood. It was over a decade ago, and it's possible that the policy didn't exist then.