You mentioned being judicious with caffeine and tyrosine usage and avoiding an over-reliance on them.
Even though Power Drive contains tyrosine, do you see any problem with using this on a regular basis after any type of activity that stresses the CNS heavily? Using Power Drive has been great after heavy lifting sessions, high volume sessions, as well as intervals and sprint training. I've even found myself using it on off days during particularly demanding training cycles.
So I was just wondering if there are times when its use should be scaled back or if it remains perfectly safe and effective over time.