What Else Can I Take Instead of Levothyroxine?

Levothyroxine remains the standard treatment for hypothyroidism, but it is not the only option. Alternatives include desiccated thyroid extract, synthetic T3 added to a reduced dose of T4, different physical forms of levothyroxine itself, and strategies that improve how your body absorbs or converts the hormone you already take. The American Thyroid Association’s guidelines acknowledge these alternatives while maintaining that levothyroxine should be first-line therapy, largely because no alternative has consistently outperformed it in controlled trials. That said, a meaningful subset of patients feel better on something other than standard levothyroxine tablets, and the reasons are becoming clearer.

Desiccated Thyroid Extract

Desiccated thyroid extract, sold under brand names like Armour Thyroid and Nature-Throid, is made from dried pig thyroid glands. It contains both T4 (the same hormone in levothyroxine) and T3 (the more active form your body normally makes from T4). This was the dominant treatment for most of the twentieth century before synthetic levothyroxine took over in the 1970s.

The research on DTE compared to levothyroxine paints a mixed picture. A comparative effectiveness study found that, as a group, outcomes were similar among patients on DTE, combination T4+T3, and levothyroxine alone. But patients who were most symptomatic on levothyroxine preferred and responded better to DTE or combination therapy.¹ A separate study comparing Armour Thyroid to levothyroxine found that roughly 13% of patients on Armour reported fatigue and weight gain with a normal TSH, compared to about 23% on levothyroxine. However, adverse effects were more common with Armour, affecting about 9% of that group versus 3% on levothyroxine.²

A systematic review and meta-analysis comparing DTE and combination therapy to T4 alone found that patients on DTE had significantly higher T3 levels and lower T4 levels, with modestly higher TSH. But there was no significant difference in heart rate, cholesterol, or scores on quality-of-life and depression questionnaires.³ In other words, blood hormone levels shift meaningfully, but standardized measures of how people feel do not reliably follow. The disconnect between lab numbers and patient-reported symptoms is one of the more frustrating aspects of thyroid treatment research.

One practical concern with DTE is that the ratio of T4 to T3 in pig thyroid tissue does not match the human ratio. Pigs produce relatively more T3 than humans do, which can sometimes push T3 levels above the normal range, especially soon after a dose. This makes DTE trickier to dose safely and is one reason guidelines still favor synthetic options.

Combination T4 and T3 Therapy

Rather than getting T3 from animal thyroid, you can take it as a separate synthetic pill (liothyronine) alongside a reduced dose of levothyroxine. This approach lets your doctor control the T4-to-T3 ratio more precisely than DTE allows.

Guidelines suggest considering combination therapy when a patient has persistent symptoms despite a normal TSH on levothyroxine.⁴ The catch is that clinical trials have not consistently shown it to be better. A meta-analysis of randomized controlled trials found no significant difference between combination therapy and levothyroxine alone for depression, anxiety, fatigue, quality of life, body weight, or cholesterol levels.⁵ Yet many patients and some clinicians swear by it. That gap between trial averages and individual experience keeps this debate alive.

On safety, a large meta-analysis looking at liothyronine use found no increased risk of atrial fibrillation, heart failure, or stroke compared to levothyroxine alone. The analysis actually observed a lower mortality risk among T3 users.⁶ That finding is reassuring given longstanding worries about T3 and heart health, though it does not prove T3 is protective, since the people choosing T3 therapy may differ in other ways from those who stay on levothyroxine alone.

Why Some People Respond Better to Alternatives

Your body converts T4 into T3 using enzymes called deiodinases, and genetic variation in these enzymes may explain why a subset of patients feel unwell on levothyroxine despite textbook-normal lab values. A particular variant in the DIO2 gene (the gene encoding deiodinase type 2) has gotten the most attention. About 16% of the population carries two copies of this variant, and those people scored worse on well-being measures while on levothyroxine alone. When they were switched to combination T4+T3 therapy, their well-being scores improved more than in people without the variant.⁷ Importantly, this genetic variant did not change circulating thyroid hormone levels, meaning it affected how people felt without showing up on a blood test.

A randomized trial took this further by looking at combinations of gene variants. When researchers grouped patients by whether they carried polymorphisms in both the DIO2 and MCT10 genes (a thyroid hormone transporter), 100% of patients carrying both variants preferred combination treatment, compared to 42% of those carrying neither.⁸ This is one of the stronger pieces of evidence that the “I just don’t feel right on levothyroxine” complaint has a biological basis in at least some patients.

Different Forms of Levothyroxine

Sometimes the issue is not levothyroxine itself but the tablet form. Standard levothyroxine tablets require stomach acid to dissolve properly, and their absorption can be disrupted by food, coffee, calcium supplements, and various medications. Two alternative formulations exist: liquid levothyroxine and softgel capsules.

Both the liquid and softgel forms are more bioavailable than tablets. Liquid levothyroxine is slightly more effective than softgel capsules when a patient is not taking interfering medications, but both outperform tablets in people who have absorption challenges.⁹ The softgel capsule releases its contents more consistently at varying stomach pH levels and has been shown to overcome absorption problems caused by certain drugs, bariatric surgery, and coffee.¹⁰

If you are someone who struggles to take your pill on an empty stomach, drinks coffee first thing, or takes other medications in the morning, switching to a liquid or softgel version of the same drug may resolve symptoms that had been blamed on levothyroxine itself. It is worth ruling out a formulation problem before jumping to a completely different medication.

Fixing Absorption Problems

Before switching away from levothyroxine, it is worth checking whether something is blocking it from being absorbed properly. A number of gastrointestinal conditions can impede levothyroxine absorption, including celiac disease, chronic gastritis, lactose intolerance, and Helicobacter pylori infection.¹¹ Celiac disease is especially worth screening for in anyone whose TSH stays stubbornly high despite adequate doses, since the intestinal damage from celiac directly reduces the surface area available to absorb the drug.¹²

Even without a diagnosed GI condition, timing and food interactions matter. Maintaining a gap between taking levothyroxine and eating, drinking coffee, or taking calcium or iron supplements reduces the risk of absorption interference.¹³ The standard advice to take it on an empty stomach 30 to 60 minutes before breakfast exists for this reason. Bedtime dosing is another option that some people find easier to stick with, though the evidence on whether it is superior is mixed.

Micronutrients That Affect Thyroid Hormone Conversion

Even if levothyroxine gets absorbed perfectly, your body still needs to convert T4 into T3. That conversion depends on deiodinase enzymes, and those enzymes require selenium. Selenium deficiency has been linked to impaired T4-to-T3 conversion and to autoimmune thyroid conditions like Hashimoto’s thyroiditis.¹⁴ Zinc plays a related but distinct role, contributing to thyroid hormone receptor structure and the feedback loop between the brain and thyroid gland.¹⁵

This does not mean everyone with hypothyroidism should start loading up on selenium and zinc pills. But if your diet is low in these minerals, or if blood tests confirm a deficiency, addressing it could improve how well your levothyroxine works. Brazil nuts are famously rich in selenium (sometimes a single nut provides more than a day’s requirement), and zinc is found in meat, shellfish, and legumes. Supplementing beyond what corrects a deficiency has not been shown to add benefit and can cause its own problems, particularly with selenium, where the gap between a helpful dose and a toxic one is relatively narrow.

The Gluten-Free Diet Question

You may have come across claims that going gluten-free can improve thyroid function. The evidence here is nuanced and depends heavily on whether you have celiac disease. In patients with both Hashimoto’s thyroiditis and celiac disease, a gluten-free diet clearly helps. One study found that patients with both conditions needed roughly 49% more levothyroxine per kilogram when they were not following a gluten-free diet. When they adhered to the diet, the difference in required dose was eliminated.¹⁶

For people without celiac disease, the picture is much less compelling. A meta-analysis of studies in autoimmune thyroiditis patients without celiac found that a gluten-free diet produced a small, borderline-significant reduction in thyroid antibody levels and a slight drop in TSH, but the antibody changes did not reach statistical significance.¹⁷ A gluten-free diet has not been shown to change the natural course of Hashimoto’s in people who do not also have celiac disease. It is a restrictive diet with real social and nutritional costs, so pursuing it purely for thyroid benefit without evidence of gluten-related intestinal damage is hard to justify from the data.

Over-the-Counter Thyroid Supplements

Walk through any supplement aisle or scroll through wellness websites and you will find products marketed for “thyroid support.” These are not regulated the way prescription drugs are, and their contents can be genuinely dangerous. An analysis of twelve over-the-counter “adrenal support” supplements found that every single one contained detectable amounts of T3, ranging from 63 to nearly 395 nanograms per tablet. Nearly half also contained pregnenolone, a steroid hormone precursor.¹⁸

Simulation modeling showed that the T3 in some of these supplements is enough to create thyrotoxic conditions, with T3 levels spiking above normal and TSH being suppressed. The tricky part is that TSH could remain in the low-normal range due to feedback effects, masking the problem on a routine blood test.¹⁹ Taking unregulated thyroid hormones without medical supervision is not a substitute for prescription therapy. If you are frustrated with levothyroxine, the answer is a conversation with your doctor about a different prescription option, not a supplement whose actual contents are unknown.

What the Official Guidelines Say

The American Thyroid Association’s treatment guidelines, which represent the mainstream consensus, concluded that levothyroxine should remain the standard of care. The task force reviewed desiccated thyroid extract, synthetic combination therapy, T3-only therapy, and compounded thyroid hormones. They found no consistently strong evidence that any alternative was superior to levothyroxine in improving health outcomes.²⁰

That conclusion deserves some context. “No consistently strong evidence of superiority” is not the same as “evidence that alternatives are worse.” Most of the trials that informed these guidelines were short, enrolled relatively few patients, and measured group averages. They were not designed to detect whether a specific subgroup (like people with the DIO2 gene variant discussed earlier) might benefit. The guidelines themselves acknowledge that combination therapy can be considered for symptomatic patients, even though they stop short of recommending it as a default.

Slow-Release T3 Formulations on the Horizon

One practical barrier to adding T3 to treatment is that the available synthetic T3 (liothyronine) is absorbed quickly and produces a sharp peak in blood levels, followed by a rapid decline. This does not mimic the way a healthy thyroid gland steadily releases hormones throughout the day. Researchers are working on slow-release formulations designed to flatten that curve.

One approach uses a polymer of zinc and T3 that forms a complex with mucoadhesive properties, meaning it sticks to the gut lining and releases T3 gradually.²¹ A clinical trial of a sustained-release T3 preparation combined with levothyroxine showed minimal variation in T3 levels over 24 hours, with a more gradual peak around four hours after dosing.²² Another trial found that the combination of slow-release T3 with levothyroxine significantly increased the T3-to-free-T4 ratio in about two-thirds of patients.²³

These formulations are not yet widely available, but they represent a potential middle ground: the physiological benefits of adding T3 without the spiky blood levels that make many doctors nervous. If slow-release T3 proves its worth in larger trials, it could shift the combination-therapy debate considerably.

Thyroid Hormone Analogues

Beyond T4 and T3 themselves, there are chemically related compounds called thyroid hormone analogues. Tiratricol (also known as Triac or 3,5,3′-triiodothyroacetic acid) is an endogenous metabolite of T3 that acts preferentially on the liver, where it lowers cholesterol and LDL, while having less effect on the heart and metabolism. In one study, patients taking tiratricol alongside levothyroxine needed about 46% less levothyroxine to achieve equivalent TSH suppression, and their cholesterol and LDL dropped meaningfully.²⁴

Tiratricol has recently gained regulatory approval in Europe, but not for ordinary hypothyroidism. The European Medicines Agency authorized it for resistance to thyroid hormone beta (RTHβ), a rare genetic condition where cells do not respond normally to thyroid hormones.²⁵ For now, thyroid analogues remain niche tools for specific rare diseases rather than everyday alternatives to levothyroxine, but the underlying pharmacology is interesting and could eventually lead to more targeted treatments.

When Pregnancy Changes the Equation

Pregnancy is one situation where the answer to “what else can I take” narrows sharply. Levothyroxine is the clear standard during pregnancy. T3-containing therapies, whether DTE or combination therapy, are generally avoided because T3 does not cross the placenta as effectively as T4, and the developing fetal brain depends on maternal T4 for proper thyroid hormone supply during early pregnancy. Most guidelines recommend that women on DTE or combination therapy switch to levothyroxine alone before or as soon as they become pregnant, and that the levothyroxine dose typically needs to increase during pregnancy as hormonal demands rise.

Subclinical Hypothyroidism and the Decision to Treat at All

If your TSH is mildly elevated but your T4 is normal, you have what is called subclinical hypothyroidism. Here, the question shifts from “what medication should I take” to “should I take medication at all.” An evidence review for the U.S. Preventive Services Task Force found that treatment of subclinical hypothyroidism (with TSH levels in the roughly 4 to 11 range) was associated with decreased coronary heart disease risk in one cohort study, but no study found that treatment improved quality of life, cognitive function, blood pressure, or weight. Effects on cholesterol were small and inconsistent.²⁶

For mildly elevated TSH without symptoms, a period of watchful waiting and retesting is a reasonable alternative to starting any medication. TSH levels can fluctuate with illness, stress, and even the time of day. If your TSH is persistently above 10, most experts would recommend treatment. Between 4 and 10, it genuinely depends on whether you have symptoms, thyroid antibodies, and other risk factors, and it is reasonable to push back gently if a doctor reflexively reaches for a prescription after a single borderline lab result.