Are there any natural hair shampoo dye that works well? Any color natural hair shampoo dye? If yes, what are they and where can I find them? Any side effect?

There are color-enhancing shampoos. I'm not sure if any of them are "natural" (and products that claim that are often not). I don't believe that any of them will lighten hair. That usually requires some sort of lightener to lighten the natural pigment in the hair. Otherwise, the natural pigment is simply added to the new pigment in the hair.

Hi kokpohlee,

What I've used for my hair is I put about one-two cups of red vinegar in my shampoo, and there are many different vinegars where you can choose your colors but since I'm blonde I always like the red vinegar cause it darkens my hair and makes it shine, if you'd like to know other vinegars for your hair look em' up.
Hope that helped:D