Levothyroxine: Can Levothyroxine affect your gut... - Thyroid UK

Thyroid UK

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Biddy51 profile image

Can Levothyroxine affect your gut flora?

2 Replies
SlowDragon profile image

Yes because being hypothyroid causes low stomach acid and poor nutrient absorption and low vitamin levels as direct result

Low vitamin D affects gut flora and B vitamins need good vitamin D too

Some levothyroxine contains mannitol. (Eg Teva brand)

Mannitol affects gut flora


Thank you Slow Dragon. I just wondered as i’ve had Hashimoto’s for over 20 years and had leaky gut a couple of years ago, which I keep under control through diet and supplements. I wondered if there was a direct link between Levo causing issue with gut flora?

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