Suggest Treatment For Knee Pain While Walking

hi, I am 29 years old, (168 cms height and 80 kgs weight) and have knee pain, sometimes while walking and climbing stairs...My doctor said after looking at the x rays, its mild arthritis and asked me to take cartigen1500 one tablet per day... was advised to take it for 3 months... will it have any side effects... planning for a baby... so just wanted to be sure if this will affect