Iron and levothyroxine

[Lilly12255]

How many hours after taking levothyroxine should I wait as a minimum to take iron supplements?

Thanks!

[greygoose]

Minimum four hours.

[Lilly12255 in reply to greygoose]

Thanks. How about vitamins b and carnitine?

[SeasideSusie Remembering in reply to Lilly12255]

2 hours.

[helvella Administrator Thyroid UK in reply to Lilly12255]

Levothyroxine interacts with many substances - I did try to maintain a list at one time but gave up. Too many to list and new additions all the time. And you need to consider not just the carnitine but also the other ingredients (e.g. Dicalcium Phosphate, Cellulose, Silica, Vegetable Stearate, Stearic Acid, Croscarmellose Sodium, Pharmaceutical Glaze).

The studies simply do not exist for many combinations.

If you assume four hours for everything, you won't be making a mistake.

[humanbean in reply to helvella]

Waiting four hours for everything might backfire on us though. I wouldn't want to take my B vitamins (for example) at the same time as my iron.

[Lilly12255 in reply to humanbean]

How much time is required between b vitamin and iron?

[SeasideSusie Remembering in reply to Lilly12255]

2 hours.