Is there any supplement which builds neurons ? i mean if someone drinks alcohol 1 or 2 times weekly , will that help ?

No not really!: Alcohol is detrimental to the neurons, so this is something you should minimize. Keep your mind active as it also needs exercise to remain alert and functional. Read a lot and learn something new every day. That is the exercise our brain needs although physical activities/exercise will also help your brain to stay young and healthy.