Health Claims

A specific spot in a protein called MCT8, kind of like a tiny switch, seems really important for how it works — if that spot gets damaged, the protein can't do its job moving stuff in and out of cells.

Scientists think they've found three spots in a protein called MCT8 where thyroid hormone (T3) might attach, and these spots look a lot like the ones in another protein that binds T3.

Some tiny parts of a protein in your body might help it switch shapes to move thyroid hormones in and out of cells.

If certain parts of a protein called MCT8 get mutated—especially in specific twisted sections—those changes might bend the protein the wrong way and break how it works, kind of like a kink in a hose.

Harmful spelling mistakes in a brain-related protein called MCT8 only show up in certain tightly packed parts of the protein, especially in spots that haven’t changed much over time — suggesting these spots are really important for how the protein works.

Rats with a drug-induced underactive thyroid show signs of liver damage, including more oxidative stress and scarring, compared to healthy rats.

In rats with an underactive thyroid, giving vitamin D helped protect their livers, but it didn’t fix their thyroid hormone levels — meaning the liver benefits probably happened for other reasons.

In rats with an underactive thyroid, taking vitamin D every day for 6 weeks seemed to help protect their liver from damage caused by harmful molecules, based on certain lab tests.

In rats with an underactive thyroid, taking higher-dose vitamin D for six weeks seemed to reduce scarring in the liver more than a lower dose — kind of like turning down the body’s scar-healing response in the liver.

In rats with an underactive thyroid, taking vitamin D every day for 6 weeks seemed to help protect their liver — especially at higher doses.

Kids can have an overactive thyroid even if their TSH blood test looks normal, especially if they have a small overactive lump in the thyroid that makes hormones on its own.

Sometimes, a harmless small tumor in a child's thyroid gland can make it overactive, leading to high levels of thyroid hormones — even when the main hormone that controls the thyroid looks normal in blood tests.

All premenopausal women with a certain type of thyroid tumor have very low levels of a key hormone (TSH), no matter how severe their thyroid symptoms are — but that low hormone level alone doesn’t tell us if their bones are being affected.

Women with a certain thyroid condition that lowers one hormone (TSH) but keeps others normal don’t show any real changes in how their bones break down or rebuild compared to healthy women — so their bone health seems fine as long as thyroid hormone levels stay in the normal range.

In women with a certain type of overactive thyroid before menopause, having full-blown overactivity (not just mild) seems to speed up how fast their bones break down and rebuild — more than in healthy women or those with only mild overactivity.

If someone with an overactive thyroid is taking a heart medication called propranolol, their T3 hormone levels might tell us how well the drug is working—but we’re not sure yet and need better studies to find out.

If someone has an overactive thyroid, taking the heart medication propranolol might lower certain thyroid hormone levels, and how much it blocks the body’s ‘fight-or-flight’ system could be linked to how strong this effect is.

Sometimes, the first sign of an overactive thyroid caused by Graves’ disease is psychosis — like confusion or delusions — and blood tests can confirm it’s due to this specific condition.

Sometimes, a serious thyroid problem called Graves’ disease in young adults can come with mental health symptoms like hearing voices, mood swings, trouble sleeping, and memory issues — and both the thyroid and mental symptoms might get better with the right medicines.

A young adult had sudden psychosis — like hearing voices and mood changes — and it turned out to be the first sign of an overactive thyroid caused by an immune system problem. This shows that sometimes, mental health symptoms can actually be caused by a physical illness.

Taking high doses of thyroid hormone to treat thyroid cancer might weaken your bones over time and increase the chance of getting osteoporosis.

If you have high cholesterol but a healthy thyroid, eating more whole plant foods and doing regular cardio exercise might help improve your cholesterol levels—even without taking medication.

If someone is just diagnosed with high cholesterol or other lipid problems, doctors should check their thyroid to see if that's part of the reason.

Your thyroid hormones help your body clear 'bad' cholesterol from the blood by turning up a cleanup system. That’s why people with an overactive thyroid tend to have lower bad cholesterol, and those with an underactive thyroid often have higher levels.