Side effects of Glutamax capsules? Does it really help lighten the overall skin tone?

Hi, Since i used to be cricketer and played quite alot under the sun and now part of my skin is quite darker which includes Arms, Hands and Face . I had consulted with doctor and she gave me some creams but it looks to be not affecting much and then i heard about glutamax capsules to lighten the skin. I wanted to know if it has any side effects and does it really help lighten the overall skin tone? Also, i'd like to know if you've any better suggestions ? Thanks!