Does B6 on its own affect thyroid blood results?

[Pinkpetite]

Hello, I booked a blood test this week but just realised I've been taking B6 each day for past few weeks and I know you're supposed to be off all B vitamins before the test. Does anyone know how it interferes with the blood results and what it affects? I'm guessing I need to cancel and re-book.

[humanbean]

It is biotin that might cause a problem with blood test results. Biotin and vitamin B6 are not the same thing. If you want to know more :

healthunlocked.com/thyroidu......

healthunlocked.com/thyroidu...

[SlowDragon Administrator]

It should be fine

It’s biotin you have to not take a week before blood tests as biotin can falsely affect test results….biotin used in many tests

[SeasideSusie Remembering]

Pinkpetite

I know you're supposed to be off all B vitamins before the test.

No, that's incorrect. It's biotin (B7) that needs to be left off for 3-7 days before blood tests as it can give false results when biotin is also used in the testing procedure. Biotin is found in a B Complex and some other supplements such as hair and nail supplements as well as a stand alone supplement.

[radd]

Pinkpetite,

On it's own ... no.

But it actually does big stuff such as creating neurotransmitters , haemoglobin, strengthening the immune system, etc. I think it’s even one of the vits included in pregnancy-combos along with folic acid, etc.

I am always surprised it’s not mentioned on the forum more as research associates its deficiency with peripheral neuropathy just as much as Vit B12 deficiency, and also elevated homocysteine (along with folate & VitB12) which can has an inverse relationship with T4.

I don’t think it’s thought of a lot because so easily assessable through a healthy diet but just like other nutrients can be low due to gut absorption problems caused by insufficient gastric acid resulting from hypothyroidism, so keep supplementing 😊.

[helvella Administrator Thyroid UK in reply to radd]

However, both the dose and the vitamer (form of B6) are important. And too much can cause peripheral neuropathy!

[Pinkpetite in reply to helvella]

It's P5P 100mg daily. I'll keep an eye on it!

[helvella Administrator Thyroid UK in reply to Pinkpetite]

100 milligrams is a high dose.

Around fifty times the top daily requirement identified here:

ods.od.nih.gov/factsheets/V...

While you might need some, and the optimal dose might be more than the standard advised requirement, that seems excessive.

But it is the safest form that I am aware of.

[Pinkpetite in reply to helvella]

OK I will see if I can get it tested. I've just started the 100mg dose. I was on 50mg for about 6 weeks beforehand. Thank you 😊

[Pinkpetite in reply to radd]

Thanks Radd I have gut issues and low HCL so hence tested deficient. Makes sense now!