What Supplements Can Interfere with a Thyroid Test?

Biotin supplements, for example, can interfere with thyroid function tests by showing falsely low TSH levels. The ATA recommends you stop taking biotin for at least two days before a thyroid test to avoid misleading results.

What supplements should you not take before thyroid test?

The ATA has recommended that patients stop taking biotin for at least 2 days before thyroid testing to avoid the risk of having a misleading test.

Can supplements affect thyroid blood test?

Some medications and supplements may also affect your results. This may be because they change your thyroid function. It may also be because they reduce your body's ability to absorb thyroid hormone. Other drugs and supplements may just interfere with the test itself.