"Animal studies have shown a risk of carcinogenesis associated with the i.m. injection of iron-carbohydrate complexes. Sarcomas were produced when large doses were given to rodents or when small doses were injected repeatedly into the same site in rodents and rabbits."
If your gastroenterologist ever prescribes this, they are a quack. This product is a surefire way to a deadly sarcoma.
I would highly advise no one to subject themselves to this needless quackery.