After 18 is height can increase by doing exercise and taking proper diet.

Question

Hi user,
gaining height is a long drawn process and you have to follow the following recommendations for up to one year to start seeing results. 
1. Doing gymnastics or swimming 2 to 3 hours daily
2. Do yoga asanas that help in height gaining: tada asana, paschimtana asana, surya namaskar asana
3. Enhance the consumption of food items rich in protein and calcium and
4. Take 2 tsp of ashwagandha avlehya mixed with milk everyday at night.

Priya Sharma Sabarad · Accepted Answer

Hi user,
gaining height is a long drawn process and you have to follow the following recommendations for up to one year to start seeing results. 
1. Doing gymnastics or swimming 2 to 3 hours daily
2. Do yoga asanas that help in height gaining: tada asana, paschimtana asana, surya namaskar asana
3. Enhance the consumption of food items rich in protein and calcium and
4. Take 2 tsp of ashwagandha avlehya mixed with milk everyday at night.

Mohan Bairwa · Answer

Your height mainly depends on your genes and it grows only till a certain age. However, it is advised that you take high protein diet i. E. Soya, sprouts, dal, milk, paneer, egg, meat, etc. 
1. Do stretching exercises daily. 
2. Do not take any medicines as they have no effect on your height, rather it may cause defect in some body parts.
3. Nothing better than a healthy balanced diet. Get well soon do not indulge/ believe in heroic measures to get increased height.