Mantra for parents good health is dedicated to Dhanwantari. The mantra should be chanted in the morning after sunrise. Person chanting the mantra should wear yellow color clothes. Here is the mantra for parent’s good health.
ॐ नमो भगवते
महासुदर्शनाय धन्वंतरये नमः॥
Om namo bhagavate mahasudarshanaya Dhanwanteraye namah
Om namo bhagavate mahasudarshanaya Dhanwanteraye namah
While chanting the mantra try to remember your parents.
The mantra should be chanted facing east or the sun.
It is highly meritorious to plant herbs and trees and take care of them.