One of the great misconceptions about donating blood is that diabetics are not eligible. In fact, there are only minor restrictions on blood donations for otherwise healthy people with either type 1 or type 2 diabetes.
The biggest requirement is that your diabetes has to be well-controlled – by insulin, oral medication, and/or by diet and exercise.
You won’t be able to donate if you ever used bovine-derived insulin manufactured in the United Kingdom, a practice discontinued many years ago.
Essentially, if your diabetes is under control, and you didn’t use certain types of insulin that are no longer made, you can donate today.
One source for the confusion is that the rules vary from one country to another. In Canada and the United Kingdom, for example, you can’t donate blood if you are taking insulin.