I have thyroid issues and was on levothyroxine for quite awhile (decade-ish) and no longer use it, and haven't for approximately 4 years now (maybe more, time flies). There is a strong possibility that you have an autoimmune issue rather than a thyroid issue. Our diets are horrendous, destroying our digestive system. This causes "leaky gut", a thinning of the intestinal wall. The body goes into overdrive attacking the foreign matter and eventually causes an autoimmune issue. Look up Hashimoto Disease. The cure is to heal your intestinal wall. To do this, you need to eliminate almost everything in your diet for two months, called AIP. Then you slowly reintroduce foods, to see which your body react to. (For instance, I react to all milk products). Others have already noted iodine. Get the kind that has the red stain. Put it on your skin, if it absorbs immediately you need it, if it doesn't, you don't. (Apply to different areas of skin to avoid contact dermatitis-some people more sensitive than others) Later, whenever you notice thyroid swelling, cloudy thinking or lethargy, restrict your diet and apply iodine. L-Tyrosine can help with thyroid function, but diet and healing the digestive system is the most important thing.

I have thyroid issues and was on levothyroxine for quite awhile (decade-ish) and no longer use it, and haven't for approximately 4 years now (maybe more, time flies). There is a strong possibility that you have an autoimmune issue rather than a thyroid issue. Our diets are horrendous, destroying our digestive system. This causes "leaky gut", a thinning of the intestinal wall. The body goes into overdrive attacking the foreign matter and eventually causes an autoimmune issue. Look up Hashimoto Disease. The cure is to heal your intestinal wall. To do this, you need to eliminate almost everything in your diet for two months, called AIP. Then you slowly reintroduce foods, to see which your body react to. (For instance, I react to all milk products). Others gave also noted iodine. Get the kind that has the red stain. Put it on your skin, if it absorbs immediately you need it, if it doesn't, you don't. (Apply to different areas of skin to avoid contact dermatitis-some people more sensitive than others) Later, whenever you notice thyroid swelling, cloudy thinking or lethargy, restrict your diet and apply iodine. L-Tyrosine can help with thyroid function, but diet and healing the digestive system is the most important thing.