Fortified foods and blood tests

[Eton]

Is it necessary to avoid foods fortified with B vitamins a week before blood tests. I know supplements containing biotin must be avoided but am not sure if the same applies to fortified foods eg cereals?

Thank you

[SeasideSusie Remembering]

It's only biotin (B7) that needs to be avoided. I imagine the amount in cereal etc is minimal. However, do check the pack and if it contains anything like 400mcg or more of B7 then treat as B Complex and don't have any for 3 days.

[Eton in reply to SeasideSusie]

Thank you Susie. I will go check my cereal now!

[SeasideSusie Remembering in reply to Eton]

400mcg per serving I should have said

[Eton in reply to SeasideSusie]

thank you for the clarification. I have checked and there is no biotin in my weetabix.