Portuguese
complexo b Catalan
complex vitamínic b 
Originally thought to be a single vitamin but now separated into several B vitamins.
1
All participants received high-dose multivitamins containing vitamin B complex, C, and E as standard of care.
2
If he succeeds, he'll start to work on finding a cheap source of vitamin B complex.
3
Foods with a high content of Vitamin B complex, such as eggs, cheese and meat, also assist mental capacity.