I am somewhat skeptical of most vitamins and herbal supplements. The evidence is constantly changing as to how much of which thing you should be taking. And from personal experience, the only difference I've ever seen from vitamins is a change in urine color. It's funny though that vitamin advocates are always so dogmatic about their supplement of choice.
That said, I do have my own supplement dogma. I am a fiber evangelist. That's right, fiber! Here's the thing about fiber that's different from other supplements: you can see it working within a day. There are studies that suggest that it can lower your cholesterol and help you control your weight. The mechanism is pretty easy to understand too. The fiber pushes out the fats and such faster so less of it is absorbed. That's not rocket science.
The problem for me is that I hate eating fibery foods. So instead of trying to change my diet, I started taking metamucil every day. It's not so bad, really. Lest you think thi...
is is a commercial or something - I actually don't take the name brand metamucil. I buy a generic equivalent. The best generic prices I've found are at Walgreens. I'd recommend the smooth texture rather than the original. I also go for the kind with real sugar rather than that chemical replacement sugar substitute that causes cancer in laboratory rats stuff. But that's just me.