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Thyroid UK
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Vitamin Profile with Graves and Partial Thyroidectomy


I had a recent blood test with Blue Horizon as I wanted to find out my vitamin levels. I take 100mcg Thyroxine and my Free T4 measures at the top of the range at 22.3. I take vitamin D as I am post menopausal.

My levels were

B12 300 ( 197-771)

Vitamin D 84.7 ( 75-200)

Iron 13 ( 6.0- 34.5)

Ferritin 174 ( 13-150)!

Folates 5.3 (3.9-26.8)

I would be grateful for any comments.


3 Replies

Would stongly suspect your dose reduction and diagnosis of fibromyalgia are linked

B12 is too low, but not low enough for GP to be interested in testing. Supplementing sublingual B12 lozenges and also good quality vitamin B complex to keep B's in balance would help

If you are taking vitamin B complex, or any supplements containing biotin, remember to stop these 3-5 days before any blood tests, as biotin can falsely affect test results



Vitamin D, many of us find getting level around 100nmol may be better, plus magnesium and vitamin K2 as cofactors

Ferritin can be high due to autoimmune issues

If you have not had FT3 and FT4 tested together with TSH recently would suggest you get this done. Perhaps wait until improvements to vitamins are sorted .

Pretty likely to have poor conversion and low FT3

Would probably have to do test privately


Medichecks Thyroid or Blue Horizon - DIY finger prick test or option to pay extra for private blood draw. Both companies often have money off offers.

All thyroid tests should be done as early as possible in morning and fasting and don't take Levo in the 24 hours prior to test, delay and take straight after. This gives highest TSH and most consistent results

Email Louise at a Thyroid UK for list of recommended thyroid specialists louise.roberts@thyroiduk.org.uk


Thanks for such a comprehensive response.

I normally buy any vitamin supplements from either Boots or Holland and Barrett. Do you have any recommendations for Vitamin B supplements?



Personally I use Jarrow B12 1000mcg sublingual lozenges and Igennus Super B complex.

Igennus recommended dose is two tablets daily, but can start with just one in morning. Best to start slow.

Others, like SeasideSusie will have other suggestions. See her very detailed advice of supplements in lots of her replies

Only ever add one thing at a time, ideally waiting about 10 days before adding another, so you can see what reaction is

I have Hashimoto's, so terrible gut function and find "Better You" vitamin D mouth spray good as avoids gut

Magnesium, lots of us use Calm vitality magnesium powder it's cheap and easy to use. Should be 4 hours away from Levo.

Vitamin K2 and selenium I swop around different brands


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