With so many vitamin B supplements to choose from, it can seem daunting to figure out which one may be the best overall. After much consideration and research, we landed on Swolverine Vitamin B Complex as the overall best vitamin B complex supplement on the market. It contains 100 percent RDI of all but one (B7) of the B vitamins your body needs. It’s inexpensive at about $0.56 per serving, and it only requires you to take one pill per serving.