While not a male, I have done vitamin research and recommend Natures Way Alive! Once daily (I use the one for women, but they have one for men).

I also take a ZMP (zinc, magnesium, potassium), b-complex, and sublingual b-12 (both Trader Joe’s brand), which are water soluble, so make for very expensive urine, but for some reason I think if my pee is nuclear yellow I am healthier.

Over the years have tried different blends. Being a vegetarian, I tend to see results in my energy level (distance runner and cyclist), skin, hair, and nails when I take a good multi and b-12 combo; thereby, providing me objective evidence that they are working and justifying all the money I am literally flushing down the toilet.