Hi. i have been noticing that parts of my hair is growing in slow. does that mean my folicles are dead. ?

Not dead: If follicles are dead/not working there would be no hair at all in those areas. Slow hair growth can be due to thyroid problems, medications, infections, stress, & some other things, which a thorough history & physical by a Dr could sort out . If you are under a lot of stress you could try a biotin supplement for a few months to see if helps.