Do hair vitamins belong on the list I send before blood tests?

The clinic's form asked for medicines. I listed my prescription, then left my hair-and-nail gummies off because they were beside the toothpaste rather than in the medicine drawer.

When I mentioned the blood tests to a friend, she said, "It's only biotin. You're overthinking it."

The tests have not happened yet. I looked at the label and found that I could not explain whether the listed amount mattered. [NIH's Office of Dietary Supplements says biotin supplements can interfere with some laboratory tests and recommends telling healthcare providers about supplements](https://ods.od.nih.gov/factsheets/Biotin-Consumer/).

I will send the clinic a photograph of the label and ask for instructions, rather than choose a stopping interval from online comments. How much detail should I include so this gets connected to my actual test booking instead of becoming a vague question about vitamins?