Hello I am 5foot 6. I am almost 18. I would like...

is it possible to increase height at 18 years old :
its totally possible to increase your height and stimulate your bones growth in some medical ways , and it can keep increase till 20 years old 
how to increase height at age 18 :
1. practice jumping and running sports such as basketball
2. avoiding stress 
3. have plenty of rest and regular sleep
4. using legs or lower weights during the day
5. using some vitamins suppliments after consulting your doctor 
what is the helpful vitamins and minerals that help you grow taller :
1. vitamin A
2. vitamin E
3. vitamin B1
4. vitamin D
5. vitamin C 
6. zinc