Haven’t taken the collagen peptides, but use glucosamine chondroitin and have a few other simple tips that may help.
Taking Advil, etc. helps not only reduce pain, but being an anti-inflammatory it reduces the inflammation that causes damage. Take it BEFORE you are going to do a lot of walking – easier to prevent pain than stop it after it has started.
Wear snug-fitting shoes/boots with GOOD cushioning. Loose shoes/boots put a huge amount of strain on your joints and good cushioning reduces the impact from walking. If my knee bothers me in the woods I’ll stop and tighten the laces on my boots – makes a BIG difference for me. Try adding Dr. Scholl’s 2X insoles to your shoes or boots.
Good luck.