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Doctor insights on: T3 Supplemental Thyroid Medication

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Dr. Austina Cho
13 doctors shared insights

Thyroid (Definition)

The thyroid is an endocrine gland that sits in the lower part of the neck. It produces thyroid hormone - which ...Read more


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Hypothyroidism-?levels 1.06tsh, T3 is 2.3. 1.better to treat symptoms or numbers for hypothyroidism ?2. Synthroid (thyroxine) or Levothryxine brand better?

Hypothyroidism-?levels 1.06tsh, T3 is 2.3. 1.better to treat symptoms or numbers for hypothyroidism ?2. Synthroid (thyroxine) or Levothryxine  brand better?

Brand Synthroid (thyroxine): Levothyroxin (LT4)=generic name for thyroid hormone. There are sev brands with Synthroid being best known (Levoxyl, Unithroid...)Each dose has about the same amount of LT4, but the FDA allows some variability. They also use diff fillers, which changes absorption. Tiny dose changes make a big diff in some people & diff brands can be like a diff dose in some. If poss take the same brand each refill! ...Read more

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Person with normal Total T4, T3 (liothyronine) Uptake, FTI, Ultrasensitive TSH but LOW Total T3 (liothyronine) (63.55 ng/dl) = Synthroid dose needs to increase?

Person with 

normal Total T4, T3 (liothyronine) Uptake, FTI, Ultrasensitive TSH 

but 

LOW Total T3 (liothyronine) (63.55 ng/dl) 

= 

Synthroid dose needs to increase?

It's OK: Hi. Your TSH is "normal", but I'd shoot for a value on therapy generally around the 1.0-1.5 range. The total T4, T3 (liothyronine) resin uptake, and FTI are prehistoric tests no one in the thyroid field has used for years. Your body regulates conversion of T4 to T3 (liothyronine), so your T3 (liothyronine) should be just what the body ordered. Your T3 (liothyronine) is close to the normal range; if you repeat it it's likely to be within normal range. ...Read more

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36 y/o female runner c/o fatigue. Cbc, cmp, tsh, t3, (liothyronine) t4, mg, b12, folate, vit. D level 140 ng/ml. Not on supplements. Asymptomatic. How to proceed?

36 y/o female runner c/o fatigue.  Cbc, cmp, tsh, t3, (liothyronine) t4, mg, b12, folate, vit. D level 140 ng/ml. Not on supplements.  Asymptomatic.  How to proceed?

Runner fatigue: That vit d level is high. Could this be from running outdoors (i.e. Sun exposure), or supplements? I am thinking the latter. You may want to question her about this. How thin is she? How much running? If she's having normal periods, then probably not hypothalamic. If she's an extreme runner, she may need to detrain briefly, but good luck trying to persuade her. ...Read more

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Parvatham Female age 65, T3 (liothyronine) 0.51, T4 6.81, TSH 26.81 How much thyroxine has to take daily?

Parvatham Female age 65, T3 (liothyronine) 0.51, T4 6.81, TSH 26.81 How much thyroxine has to take daily?

Depends . . .: Initial dose of Levothyroxine to treat hypothyroidism is a mix of both art & science as it depends upon several factors such as age, weight, presence/absence of heart disease, etc. Check out http://www.globalrph.com/thyroid_calc.htm for starting point. Try to get same brand name each & every time as body is very sensitive to minor variations in dosing which can occur btwn generics despite same dos ...Read more

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What are the side effects of taking T3 (liothyronine) thyroid hormone for weight loss?

What are the side effects of taking T3 (liothyronine) thyroid hormone for weight loss?

Bad idea: Taking T3 (liothyronine) for weight loss is a bad idea. Excess of thyroid hormone can cause these and more :•nervousness •irritability •fatigue •fast heartbeat •weight loss •insomniahair lossthin skin •intolerance to heat •increased perspiration •muscle aches •weakness in upper arms and thighs •increased bowel movements •decreased menstrual flow. ...Read more

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Current blood work: T4 8.0 (4.5-12) TSH .049 (.45-4.5), with hypothyroidism and hashimotos, taking 90mg armour thyroid, are these levels ok?

Current blood work: T4 8.0 (4.5-12) TSH .049 (.45-4.5), with hypothyroidism and hashimotos, taking 90mg armour thyroid, are these levels ok?

Thyroid problem: If the lab is reporting TSH .049 with normal range of .45-4.5 then it means that you are taking too much thyroid armour. Check with your doctor. If the test and normal range are correct then you should be on less thyroid armour. ...Read more

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Should methimazole be dosed on TSH or ft4, t4, t3, (liothyronine) ft3 levels?

Should methimazole be dosed on TSH or ft4, t4, t3, (liothyronine) ft3  levels?

All of the above: Methimazole is a thionimide that inhibits the formation of thyroid hormone it is important to measure tsh, ft4 ; ft3 (liothyronine) levels to have a better idea of the physiology causing the hyperthyroidism, ie is it subclinical hyperthyroidism, t3 (liothyronine) preferential secretion, or severe thyrotoxicosis. The TSH can be very suppressed with only minimally elevated t4/t3 (liothyronine) which would not need as high a dose. ...Read more

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My thyroid test shows thyroxine 13.3 microgram %, tri iodo thyroxine 1.81 ng/ml thyroid stimulating hormone 1.8 uIU/ml. Is there any problem?

My thyroid test shows thyroxine 13.3 microgram %, tri iodo thyroxine 1.81 ng/ml thyroid stimulating hormone 1.8 uIU/ml. Is there any problem?

Thyroid tests: These appear to be normal values, but you did not provide the normal values: the normal range varies from one lab to another. If they're normal, then you are not hyper or hypo thyroid. But why were these tests performed? This needs to be interpreted by whomever ordered these tests. ...Read more

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Thyroid nodule: follicular lesion, T4 free is low, T3 (liothyronine) free is low, and TSH 3rd generation is now low. 60 mg of armour thyroid, 50 mcg levothyroid why?

Thyroid nodule: follicular lesion, T4 free is low, T3 (liothyronine) free is low, and TSH 3rd generation is now low. 60 mg of armour thyroid, 50 mcg levothyroid why?

Stop Armour: There is no way to check your levels or keep your thyroid in control in your current regimen. Armour thyroid is ground up pigs. Switch to brand name T4 only and get it regulated. Also, have repeat thyroid biopsy with afirma test and consider surgery to remove nodule depending upon lab and ultrasound. ...Read more

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Do low T3 (liothyronine) and free T3 (liothyronine) values mean hypothyroidism?

Do low T3 (liothyronine) and free T3 (liothyronine) values mean hypothyroidism?

Possibly.: These along with low t4, free t4, and high TSH would mean hypothyroidism. But a low TSH would possibly mean a hypothalamus/pituitary problem. If any of the thyroid values/tsh are not low, then it might be wise to keep following before having a diagnosis made and therapy done. Check with your doctor to be sure. ...Read more

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Any success stories when adding T3 (liothyronine) to Levothyroxine treatment for Hashimotos?

Any success stories when adding T3 (liothyronine) to Levothyroxine treatment for Hashimotos?

Some yes, some no: Hi. Good question. A lot of subjective influence and personal preference. We all know it's not necessary, but some people swear they feel better, and that's part of my goal in treating patients. Of paramount importance: don't CAUSE hyperthyroidism in the process. If I add T3 (liothyronine) to l-thyroxine, I add 5 mcg in the morning. It can be adjusted, of course, depending on response and thyroid labs. Cheers! ...Read more

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T3 (liothyronine) 0.98, T4 8.79, TSH 1.24 told normal although endocrinologist said have nodules and thyroid looks stressed, prescribed low dose levothyroxine ..Why?

T3 (liothyronine) 0.98, T4 8.79, TSH 1.24 told normal although endocrinologist said have nodules and thyroid looks stressed, prescribed low dose levothyroxine ..Why?

Ask the doctor: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, your lab test are normal and you should ask the doctor who prescribed the medication. ...Read more

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Age:42, on thyroid replacement therapy, dub , small fibroids, high ldl, what multivitamins I should take? Natural vs synthetic? Calcium supplements?

Age:42, on thyroid replacement therapy, dub , small fibroids, high ldl, what multivitamins I should take? Natural vs synthetic? Calcium supplements?

Multivitamin+mineral: There may not be proof that multivitamins change a person's thyroid status, dub symptoms, fibroids, LDL levels, etc... American adults can take a multivitamin + minerals (one might trust name brands more). Natural or synthetic, or a mixture, should have the same effects. One can bring all his vitamins to the primary care doctor to review. Iron may help, if heavy dub. Vitamin d is needed, if low. ...Read more

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Would standard process adrenal supplements (drenatrophin pmg and adrenal desiccated) affect labs – cmp, tsh, free t3, (liothyronine) free t4?

Would standard process adrenal supplements (drenatrophin pmg and adrenal desiccated) affect  labs – cmp, tsh, free t3, (liothyronine) free t4?

Adrenal supplements: 46F asks about lab effects of adrenal supplements on CMP,TSH,FT3 and Free T4. This has likely never been studied as there is no regulation of adrenal supplements & makers can put anything in them until a bunch gets sick & reported to FDA. I would avoid these unless you need to waste money. I would also avoid a Dr who prescribes them. But need more information. Consult with me. ...Read more

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Low total t3 (liothyronine) 46 and low range TSH and T4? Hypothyroidism? Would it be treated with supplement?

Low total t3 (liothyronine) 46 and low range TSH and T4? Hypothyroidism? Would it be treated with supplement?

Low tsh: If you only needed thyroid supplement, your tsh would be elevated. Since your tsh is not elevated and your thyroid hormones are low,there could be a problem with your pituitary gland. An endocrinologist is best qualified to evaluate,advise and treat you and more than thyroid supplement may be needed. Appropriate tests will be ordered. ...Read more

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Do benzodiazepines have any affect on tsh, t3, (liothyronine) t4, free t3, (liothyronine) free t4, or reverse T3 (liothyronine) levels? Will they affect my thyroid test results?

Sometimes: Benzos do not change basal secretion of TSH, but they do decrease the amount of TSH released by exposure to cold. In one study, diazepam reduced affinity of nuclear T3 (liothyronine) binding. So benzos can have some theoretical effects, but it should not be enough to affect standard thyroid tests. ...Read more

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If my tsh low, t3 (liothyronine) and t4 is normal, is it hypo or hyper thyroidism? Should I take iodine? Ultra sound is normal, without pathology.

If my tsh low, t3 (liothyronine) and t4 is normal, is it hypo or hyper thyroidism? Should I take iodine? Ultra sound is normal, without pathology.

Hypothyroid: The answer to this question depends on what your exact levels are and what type of symptoms you have. "Subclinical Hypothyroidsim" sometimes presents in the manner you describe. ...Read more

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My thyroid test results are low t3, (liothyronine) freet3 is barely within range low end. How can I get my dr. To try thyroid medication to see if it would help?

Need more info: What are your symptoms? Symptoms of under active thyroid? What are your other levels? Free t4, tsh, thyroid antibodies test? If feel not getting anywhere you can try and see a specialist in thyroid called an endocrinologist who may be able to help you and explain your labs and treatment options if any available to you. ...Read more

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"i have my T3 (liothyronine) -4.24 t4-1.35 and TSH 0.014 please me the course of action further.. I had never gone on thyroid medication earlier. ?

"i have my T3 (liothyronine) -4.24 t4-1.35 and TSH 0.014 please me the course of action further.. I had never gone on thyroid medication earlier. ?

Hyperthyroid: Labs showed hyperthyroidism. Not sure what symptoms you are currently experiencing. You said you are not taking any thyroid med at this time. I recommend seeing your doctor for further evaluation. Next step is a thyroid uptake and scan. You could have graves disease, thyroiditis or a hyperactive nodule/s. Good luck. ...Read more

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I had a thyroid panel test and my results are below. Should I be taking medication? TSH - 8.070 T4, Total - 5.4 T3 Uptake Ratio - 26 FreeThyroxine-1.4

I had a thyroid panel test and my results are below. Should I be taking medication?
TSH - 8.070
T4, Total - 5.4
T3 Uptake Ratio - 26
FreeThyroxine-1.4

Repeat test: Ideally, thyroid panel tests should be evaluated based on the reference range for the laboratory where the tests are performed. Most commonly, the reference range for TSH = 0.5 - 5.5. Although your TSH may be slightly high, you may not need treatment. Your total and free T4 are normal. Results such as these usually warrant retesting in 1-3 months. TSH will often return to normal without treatment. ...Read more

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I seen a thyroid specialist my TSH is low but my T4 and T3 are normal he told me that my thyroid gland is bigger then normal also I have slow reflex. My hair is thinning really bad. I'm tired all the time but he won't put me in thyroid medication why?

High TSH: Current guideline for thyroid replacement if T4 and T3 normal is TSH >10. Positive antibodies against thyroid would help decision. In young women especially after pregnancy enlarged thyroid is not unusual. Sick euthyroid syndrome implies other disease (anemia, inflammation, hidden infection) that may change thyroid hormone metabolism and cause high TSH. So there are likely outstanding issues. ...Read more

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Should i take vitamin d or any other supplement or anything for thyroidism?

Should i take vitamin d or any other supplement or anything for thyroidism?

Vitamin D won't help: If you truly have hypothyroidism the treatment is to take thyroid hormone prescribed by a doctor who has reviewed your thyroid test results. Vitamin d is not the treatment for thyroid problems. ...Read more

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Which is better for under active thyroid. Syntheroid or t3 (liothyronine)?

Synthroid (thyroxine): Synthroid or some form of levothyroxine is most commonly used. If you are taking it and are concerned that it is not working properly after several months you can ask your doctor to check T3 (liothyronine), (liothyronine) but usually with an adequate dose of T4 the body synthesizes plenty of T3 (liothyronine). ...Read more

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What does it mean if most of my thyroid levels are in the low normal range and my T3 (liothyronine) is low?

Nothing: T3 (liothyronine) is important inside the cell, in the blood, the measurement is usually meaningless. If the other thyroid tests (free T4 and tsh) are normal, ignore the t3, (liothyronine) as it's a waste of your blood and money. ...Read more

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I'm taking 4 grams of armour daily but still feel cold. Should i supplement with additional t3 (liothyronine)?

I'm taking 4 grams of armour daily but still feel cold.  Should i supplement with additional t3 (liothyronine)?

Don't treat: Symptoms blindly with medication. That's what doctors and lab tests do with much better accuracy and safety. Armour thyroid should not be used by humans; it's not standardized on the basis of thyroid content. It also contains t3, (liothyronine) so definitely don't take more T3 (liothyronine) -- it's dangerous. See a real doctor. ...Read more

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What causes an elevated reverse T3 (liothyronine) level but the other thyroid levels are normal thyroid??? My reverse t3 (liothyronine) was 35

Many causes: First, I am impressed your doctor tested reverse T3 as few doctors ever check it. There are many possible causes of increased reverse T3 including high cortisol (from chronic stress, emotional or physical), inflammatory conditions, injuries and infections like Lyme disease (which is surprisingly common and often undiagnosed). See http://www.stopthethyroidmadness.com/reverse-t3/ for more info. ...Read more

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What does it mean to have a total T3 (liothyronine) and reverse T3 (liothyronine) in thyroid diagnosis?

Opposites: T3 (liothyronine) is the more active thyroid hormone. Reverse T3 (liothyronine) is not really functional. When someone is very sick or loses too much weight, the body will sometimes divert thyroid hormone production into an inactive state in an effort to turn metabolism down to conserve energy. That would be the reverse t3 (liothyronine). ...Read more

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Came off wrong T3 (liothyronine) meds and did thyroid tests weeks later - everything normal. Have no appetite except for jello and yoghurt now - help?

Unclear question: Hi. T4 is the normal thyroid med (aka levothyroxine, l-thyroxine, Synthroid, etc). T3 (liothyronine) is a different thyroid med sometimes used with T4. There is desiccated porcine thyroid extract from pig thyroids. There aren't different T3 (liothyronine) meds. If you came off T3 (liothyronine) and were still on T4 with normal labs, that's expected. Using T3 (liothyronine) is not necessary; the body makes it's own T3 (liothyronine) from the T4 you take. ...Read more

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I don't understand why I need less levothyroxine after removal of my ENTIRE thyroid. My dr lowered my dosage. Does the body make more T3/4 elsewhere?

Adjust the dose: You do need levothyroxine after removal of thyroid gland. Usually if the lab test shows very low TSH then we do need to decrease the dose so that TSH comes up to acceptable level. Sometimes patients need less dose with advancing age or after losing weight. T4 is solely a product of the thyroid gland, whereas T3 is a product of the thyroid and other tissues where it is formed by deiodination of T4 ...Read more

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Thyroid function in "normal" range. Took 2.5mcg T3 (liothyronine) for 2 months, then stopped. What potential harm did I do? What should I do now, afterward?

Thyroid function in "normal" range.  Took 2.5mcg T3 (liothyronine) for 2 months, then stopped. What potential harm did I do?  What should I do now, afterward?

T3 (liothyronine) use for two month: The question I have to ask you why were you prescribed T3 (liothyronine) and why did you take for two months with normal thyroid profile.Having said that you did not cause and short or long term problem and once you stopped it, it is out of your system for good.So with normal thyroid function which incldes t3, (liothyronine) t4, and tsh.If all are normal there is no indication for any hormone therapy. ...Read more

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Dr. Jesse Krakauer
460 doctors shared insights

Liothyronine (Definition)

Liothyronine is a thyroid ...Read more


Dr. David Geffner
459 doctors shared insights

T3 (Definition)

T3 is a thyroid ...Read more