First of all...the melanin
content of the body is genetically determined.
Though it can be reduced by use of some bleaching agents, they have lots of side effects.
So...the best way to increase skin fairness would be to use sunscreen lotions while going out in sun.
has no effect on sperm count
It is a multivitamin
But it is just a health supplement & should not compromise with your daily intake of a balanced diet.
Consume more of natural diet like fresh fruits, green vegetables, milk, eggs, wheat, etc.
Stay away from smoking
Best is to stay active, exercise regularly, avoid stress, get good sleep, think positive and stay happy.
Wish you a healthy life.