Any known issues to use colour in your hair?

[babydoll]

Do someone out there know if there is any known issues to colour your hair - for example from blond to brown?

Can that make you loose more hair or not get the best results with propecia or Regaine foam?

Anyone know something about this?

 

[Artista]

I color my hair. I use Loreal gel creme. The gentler to product (low or no amonia) the better. But I'm not losing more hair because I color..