i am making bullet lipsticks since two years. going very well but one issue my Lipstick expire within one year.
i add vitamin e (pure tocopherol) so that oils in lipstick font go rancid. my clients are demanding more shelf life.
i want to add parabens to extend shelf life can you people guide which parabens should be added in lipstick formula plus what percentage is required.
i started working on liquid matte lipstick as well and want to add parabens to extend shelf life.
parabens are ok to use for my purpose or is there any other option i could use to extend shelf life at least 2-3 years ?
looking forward to hearing from you all.