Hi
Leaving off my b complex with 300ug biotin today for Thyroid blood test on Friday is that long enough? I forgot to stop earlier if so I'd rather wait for another date also does anyone know why potassuim drops ?does more b12 injections cause it to drop? My sodium is top of range but potassium seems to have dropped on my last Fbc
Re low potassium see humanbean first reply in this post
Apparently yes starting B12 can lower potassium
healthunlocked.com/thyroidu...
Re stopping biotin, yes that’s all most certainly long enough before blood test
Lovely Thank You I thought it had to be 7 days or more
Your dose is low.
The issues became apparent from people taking huge doses.
I have previously posted:
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 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.
healthunlocked.com/thyroidu...
Thank You helvella I have read the post I was lucky to get my blood tests done at my GP this week so that's settled my mind that 5 days without biotin is fine...
And Thank You re potassium so much to learn I upped my B12 injections and noticed potassium going down so human beans posts very helpful...
Blood test results
Biotin 130
Biotin & Blood Work
Biotin affecting test 
Blood test 
