Blood test, Marmite

[Calceolaria]

I understand that Marmite contains biotin via the yeast extract. Does this mean no Marmite on toast for a few days before blood test please?

[helvella Administrator Thyroid UK]

Ordinary consumption of foods that contain biotin is NOT a problem.

You would find it hard to consume 100 micrograms of biotin in ordinary foods - even foods which are sometimes considered high in biotin.

helvella - Biotin supplementation and testing

A short article about how and why biotin can affect blood tests. Includes information about how to avoid any problems.

helvella.blogspot.com/p/hel...

[Calceolaria in reply to helvella]

Very many thanks. I shall read that now.

[RedApple Administrator]

'no Marmite on toast for a few days'

Absolutely no need whatsoever to torture yourself in that way! 🤣

[Calceolaria in reply to RedApple]

Plenty of other ways! 🤣

Thanks.

[Regenallotment]

although marmite does contain gluten unless you find an impersonator product (Sainsbury’s I think) that is GF 👏 (if that is relevant for you) 🌱

[Calceolaria in reply to Regenallotment]

Not convinced about gluten-free in my case, as yet. Thanks.

[TaraJR in reply to Regenallotment]

Morrisons Marmite substitute is gluten free. It doesn't actually say it on the jar, but Coeliac UK says it is.

[Tiller-girl]

After experiencing several blood test results which didn't actually reflect how well my levothyroxine dose had and continued to make me feel well for 14 years I had to have a retest after 6 weeks. After inspecting the ingredients on my multivitamins and other supplements (including Biotin and Quercetin ) I knocked them all off for a week before the blood test. Lo and behold it came back within the acceptable levels. Not sure if it was a fluke but I will do the same next time and if it works then my annual wrangling match with the doctor will hopefully be a thing of the past. Happy GP = Happy Me!