Good morning All,

Please could you give me some advice?

I have Autoimmune Hashimotos and have been taking Levothyroxine 75mg per day since July 2017. I also take Vitimin D 800iu per day, B complex and Vit K-MK7. I had been taking Selenium but decided to stop on 23 September as I had read that you should not take it all the time.

on 7 September my thyroid blood results were:

TSH 1.53 (0.27-4.20)

FT4 18.7 (12-22)

and on 6 October my thyroid blood results were:

TSH 2.56 (0.27-4.20)

FT4 19 (12-22)

For the first time in ages I was feeling great around the time my TSH was 1.53, then I started to feel sluggish again. I am wondering if it has anything to do with stopping taking Selenium.

Thanks in advance for your advice.


12 Replies

  • Selenium is required for the conversion of T4 to T3.

    Usually, a dose of 75-100 mcg is safe to have on a daily basis and to reduce Hashimoto's antibodies, a dose of 200 mcg is required.

    Vitamin D is also needed for the conversion and a dose of 800 iu daily is on the low side to make a difference whether for addressing a deficiency or for maintenance.

    Your T4 levels are optimal but the TSH level is a bit high which is indicative of conversion issue.

  • Hi researcherUK

    Many thanks for your reply.

    I did have a loading dose of Vitimin D 6 months ago and now taking 800iu maintenance dose, my current level is 92.9 (50-200), do you think it needs to be higher?

    Many thanks.

  • You are very welcome, HKAnne.

    What are the units that were used for the range? are they ng/ml?

    According to the Vitamin D Council

    If they were ng/ml, your levels fit within high normal.

    High Normal: 80-100 ng/ml (200-250 nmol/l)

  • Hi researchUK,

    The units used for the range were nmol/L, it states on the results sheet 75-200 nmol/L = Optimal.

    Many thanks for the vitamindcouncil link.

  • HKAnne

    my current level is 92.9 (50-200)

    That looks very much like we normally see in the UK where the unit of measurement is nmol/L.

    The Vit D Council recommends a level of 100-150nmol/L.

  • Hi SeasideSusie,

    Many thanks. At the moment I am taking 800iu per day, to get up to 100-150, do you think I need 1000iu per day or slightly more?

  • HKAnne - as it's winter and we can't get any Vit D naturally from the sun, I'd be inclined to take your current 800iu plus an extra 1000iu. Retest in 3 months and see where you are.

    Are you taking Vit D's cofactors K2-MK7 and magnesium?

  • Hi SeasideSusie,

    Sorry for delay in replying.

    Thank you for that advice, I will increase Vitimin D and re-test in 3 months.

    Yes, I am taking K2-MK7 but not taking magnesium, my magnesium levels were quite good.

    How long should you take Selenium for?

    Thanks again.


  • How long should you take Selenium for?

    As you are Hashi's, and selenium helps reduce antibodies, I would think that selenium is one of your must have regular supplements.

  • SeasideSusie,

    Many thanks.

    Have a goood weekend!


  • Suggest you recheck vitamin D level, 800iu is very often not enough with Hashimoto's -£28 postal kit

    Also have you considered gluten free diet ?

    Many with Hashimoto's find it helps

    Plus remember to stop vitamin B complex before blood tests

  • Hi SlowDragon,

    Many thanks for your reply and website details.

    Vitamin D level is currently 92.9 (50-200), I had a loading dose approximately 6 months ago, when the level was 27 (50-200). Perhaps it needs to be a bit higher?

    I started a gluten free diet two months ago.

    Unfortunately, my GP called me in for a blood test (cortisol and glucose) at the last minute and I had already taken B Complex, does it skew the results hugely? I can't see him agreeing to let me have another one.



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