Whey protein can be taken if you are into organized medium - high intensity exercises, as it is believed to help your muscles recover. There are various national and international brands available to choose from. Just make sure you are buying from a trusted source.
1 scoop whey protein with water within 10 minutes of finishing workouts is general suggestion.
However always remember that this is just a supplement and not a replacement for protein rich natural foods.
Next Steps
For 'better health' eat home cooked fresh meals, exercise for 30 min/day, hydrate, sleep well and work on de stressing!