Vitamin b12 or b12?

Question

Search Engine Optimization

Tell me how to write headlines and text correctly if users request "vitamin b12", but "b12" will be correct? Also wondering if you should bother with the case of characters?
Thank you.

Answer 1

That's right: Vitamin B ₁₂
And they will also write "vetamin", "vitamin", etc.

Answer 2

The site must be spelled correctly.
Yandex has long learned to correct grammatical errors.
If he does not know how with vitamins (check it yourself), then he will soon learn.

Answer 3

wordstat.yandex.ru - check the frequency of queries here, what B or B asks for more, then write in the title.
And in the text itself you can already write this way and that