one of things I've been researching regarding leg fatigue - in my case calves - is protein within the first 30 mins after exercise. I bougth some protein powders and I"ve been mixing those when I get home from a tough climb up that "doggone" mountain. Some days it seems to help - some days it doesn't. I don't know how old you are - I'm 45 - but another thread mentioned taking longer to recover these days and boy does it!......keep up the good work and hope this helps!.......btw...let me know if YOU find anything the helps!....I'm still open/researching things to reduce the fatigue.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"