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Having an overactive or underactive thyroid has been shown to affect levels of CoQ10 in the body. However, there doesn't appear to be research on whether CoQ10 supplementation affects thyroid hormone levels or thyroid medication. This is discussed in the "Cautions and Concerns" section of the CoQ10 and Ubiquinol Supplements Review, along with information about other potential drug interactions with CoQ10.

Be aware that other supplements, such as calcium, magnesium, iron and soy can interfere with thyroid medication, and biotin supplements can interfere with thyroid tests. More details about this can be found in our CL Answer about supplement interactions with levothyroxine.

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May 14, 2019

Does supplementing with CoQ10 affect my body's use of Levothyroxin that I take for hypothyroidism?
I was diagnosed with low thyroid hormone in 1993. Started taking Levothyroxin then. In 2000 my cardio doc recommended that I take CoQ10 for my hypertension. Since then my blood tests indicate that I need more and more and more stronger thyroid med.
Any studies that the CoQ10 and Levothyroxin don't get along? Or am I the lab rat?
May 15, 2019

Hi Max - Thank you for sharing your experience with this. As noted in the Answer above, there does not appear to be any research on whether CoQ10 affects thyroid medication.

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