I have hyperthyroidism & was wonderin if its safe to take supplements to exercise/workout? Or are there certain ingredients/supplements I should avoid

Yes, be Careful. If you are on medication for hyperthyroidism, or any medications, you should always check with your doctor before taking any supplements. Some supplements can definitely interfere with medications.
Hyperthyroidism. Exercise and some supplements are safe and good for you. I would avoid supplements that contain iodine. A healthy life style and healthy diet are very important. Do not smoke or use illicit drugs, and do not inhale second hand smoke.