We don’t need to replace sodium during endurance efforts after all?

Nutrition
22

Is that a result of the sodium, or the chlorine from using table salt? Personal experience is that it’s the former, and I have better experiences when I use hydration products or custom mix that provides at least some of the sodium via sodium citrate vs. mix that is 100% sodium chloride. I started doing that based on (among other things) prior discussion here.