this may not be a cosmetics question because its dietary rather than topical. and i may have seen a post about a similar topic.
also, i just jumped off the castor oil debate but i still harbor a maniac obsession for long eyelashes. so, in the same wishful thinking, would hair and nails vitamins facilitate longer eyelash growth?
The data we’ve seen indicates that vitamins help with hair growth only when you’re malnourished. If you’re eating a reasonably healthy diet, taking additional vitamins does not substantially improve hair growth.