B vitamins play a foundational role in converting food into usable energy, and a deficiency in any of them can contribute to fatigue.
MetaboSwitch's marketing material describes this as a "blend," without naming which specific B vitamins are included or in what amounts.
It's the least specific ingredient on the label graphic we reviewed — useful in principle, but harder to evaluate than a single named vitamin with a disclosed dose.
Where it sits in the formula: one of eight ingredients named in MetaboSwitch's marketing graphics, alongside White Kidney Bean Extract, Green Tea Extract, Garcinia Cambogia, Chromium Picolinate.