I only took 20mg of MT2 last year on my first run ever and my hair went from auburn to almost dark brown with only the slightest hint of it's original auburn.
That is a pretty low does for hair color change. My beard also went dark.
viewing others experiences, it doesn't seem to be a common side effect at low doses.
That is pretty amazing, thank you for sharing and for the question bretbeat. Who knows, your unique melanocortin system mutations which provide your natural redness may be a great deal easier to overcome with potent melanotan peptide usage (as your mutations may be less complex/severe than say a redhead or blond).
I'm a blonde naturally, a dirty blonde to percise almost brown. My hair didn't change nor did my beard but my beard naturally comes in pitch black. I did notice some darkening of body hair though which normally a bleach blonde.