You're a 21 yr old male. Popping pills is a bad idea. Focus on improving your lifestyle by learning more about nutrition. For example, if you want to get more
vitamin A, google vitamin A rich foods and you'll get a list of 10 to 20 items. Maybe you like just 2 or 3 of them. That's good enough! Just add those 3rd food items in your regular diet.
Next Steps
Your body is a masterpiece made by the almighty. Just improve your diet and your lifestyle and it will take care of itself.
Health Tips
There is no guarantee of the purity of the vitamins manufactured. Also, if the vitamins you consume are more than what your body needs, it will have to work hard to get rid of them.