This happened in my (31yo) beard, which allowed me to watch it shift grey and back in a short time, and it absolutely coincided with ~3 months of work where I w

This happened in my (31yo) beard, which allowed me to watch it shift grey and back in a short time, and it absolutely coincided with ~3 months of work where I was killing myself, and went away when I took 2 steps back and resumed riding my bike outside a few times a week.