Biotin - is 6 days long enough?

I totally forgot about a blood test I had coming up.

It's tomorrow morning.

I've been sporadic on taking my b vits this month taken a grand total of 8 times this month. 🤦🏻‍♀️Typically 2 of those times were 23rd & 24th which will be 6 days gap between taking biotin and having bloods drawn.

Is that long enough? I know advice is leave at least a week but I'm wondering if I might scrape through!

Does the fact that I've not taken much very this month go anyway to help my cause?!🤞🏼

[helvella Administrator Thyroid UK]

At the start of the reports of interference from biotin, the issue was discussed regarding Multiple Sclerosis patients who were taking absolutely massive doses of biotin. Like "three daily doses of 100mg".

The maximum dose of biotin available from a UK chain is 5000 micrograms. That is, 5 milligrams. Just 5% of the dose being used for MS - and probably only taken once a day!

Most "B complex" and other multi-ingredient supplements will have far less.

Our actual established daily requirements are as low as 35 micrograms a day. We might get that much from our diets.

There has never been evidence of interference with tests from the sort of dose we get in our diet.

To begin with, the advice was often that two days was plenty of time without biotin. This is very likely plenty for low dose biotin - somewhere near daily requirement level.

To be absolutely sure, it is often suggested laying off biotin for a week. It is a short, easy to remember, safe and probably universally acceptable time. But almost certainly excessively long for people who just get a little biotin in a multivitamin.

I feel that while everyone should be aware of the issue, it is getting people excessively worried.

[Hidden in reply to helvella]

Oh good! Thank you for that. It's eased my mind.

It's tricky when all the GP will test is TSH and will prescribe levo accordingly. I'm looking for an increase in dose I really don't want a false low at the moment.