The best option representing safe advice for the use of iron supplements is:
Iron supplements should be taken to correct iron-deficiency anemia.
This statement reflects the appropriate use of iron supplements for individuals diagnosed with iron-deficiency anemia. It's important for individuals to consult with a healthcare provider before using iron supplements, as unnecessary supplementation can lead to health issues. The other options either promote blanket advice that may not be suitable or contain inaccuracies regarding the use of iron supplements.