easy to apply no irritation great price [SEP] so far so good i have used many different lash serums including rodan fields i have only used this product for three days and so far there is no irritation if you have never used a lash serum before it is very easy to put on it is almost like applying clear eye liner most lash serums suggest putting on before bed at night i can never remember when i go to bed so i put mine on in the morning when i am applying my makeup for me this works fine i just let it dry for a minute and put my eye liner over it i have done that routine with this product and it has done fine as with the other ones i have tried i will also be using it in my eye brows in three days i have not noticed a huge difference in the length i have long lashes anyway but i have also not noticed any irritation or loss of lashes like i have seen in some this is also a great price for eye lash serum