You have two changes at once here. You cannot attribute anything until one of them moves.

Reference ranges differ between labs, so comparing two reports is close to meaningless.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers.

Most of the popular protocol is borrowed from a clinical population and applied to healthy people without comment.

Worth asking what specifically was measured. Pain scores move with mood and function does not. Three weeks in on a wrong entry in the record and it li…

What is the first thing you would read if you were starting from zero? How long have you been on citicoline?

A plausible mechanism is not an outcome, and this class is the textbook example. Currently on collagen peptides myself.

Reference ranges differ between labs, so comparing two reports is close to meaningless.