Are those what they used to call "black beauties"? I heard those pills were extremely popular back then, especially with pool players.
The best multivitamin supplement, coming from a person who is a doctor and also has a PHD in biology, is this stuff called Theragran-M. I think there is a kind for older people. He said Centrum is not as good, and is lacking in a few things that most people need, which Theragran has. Its like $8 for 1 month supply. You take 1 pill when you wake up on an empty stomach, once a day.
I tried a free sample of Focus Factor for three weeks after I got lazy and stopped taking Theragran. I didn't feel too good on them, and you have to take a bunch of pills per day. Plus, the pills are huge and hard to break in half. I choked on one and luckily coughed it up. I stopped taking them after that.