What's the worst thing that can happen from someone with borderline normal thyroid hormone taking synthroid?

Basically if I am just bordline normal (almost low) and I take synthroid...what's are the worst things that can come from it?

http://www.altsupportthyroid.org/...
Fatness...Thats what happened to me and a lot of people I know...
Borderline.....I've heard that before. Chances are you are hypothyroid. The TSH is very unreliable for diagnosing hypothyroid as TSH varies throughout the day. To get diagnosed by this test, you have to have had an early morning TSH. I recommend that you find out your lab results, as you may be hypothyroid. Many doctors are now stating a TSH over 3.0 is hypothyroid, while labs still have the range at 5.5. Check out what yours is. Retest again in the morning and get a TSH, free t4, free t3, and an antibody test. Below is a good thyroid link below.

About the Synthoid, why Synthroid? There are so many other medications. I'd research this more. Most hypothyroid patients feel better with a T4/T3 medication like Armour or Thyrolar, where Synthoid is just T4. The more you know about being hypothyroid the better. Chances are you are hypo.

I know people who self treat with Armour, as they can do this by body temps and an occassional blood test. I don't know anyone who has dosed themselves using Synthoid.
synthroid is used for hypothyroidism-to supplement the thyroid hormone in your body I guess you would have to titrate the dose according to your TSH and free T3 and T4 (via the blood tests) always check drug contraindications.