the field of the present invention relates to improved cosmeceuticals capable of stimulating the growth of hair , e . g ., natural eyelashes , in a human subject . more specifically , the present invention relates to delivery devices that provide for effective , targeted application of a therapeutically effective amount of the improved cosmeceuticals . importantly , the targeted application helps to limit and / or eliminate concerns about the cosmeceutical active ingredient effecting unintended areas of the body .