What lash serums can and cannot do
Lashes grow in cycles, and at any moment yours are at different stages of it. That is the single most useful thing to understand before buying a serum, because it explains why results take eight to twelve weeks. You are not thickening the lashes you have, you are influencing the ones growing in behind them. Stop using the product and lashes gradually return to their natural cycle.
Conditioning serums coat and strengthen the lash so it breaks less, which makes for visibly fuller lashes without changing growth. Prostaglandin-analogue formulas genuinely extend the growth phase and produce the most dramatic results, but they carry real side effects worth reading about first, including possible iris darkening. The reviews below make clear which category each product falls into.
