Lash Serum Safe For Breastfeeding. Eyelash serum brands will likely have this information on their website, for example, on their. * like many cosmetics, flash has not been tested on women who are either pregnant or breastfeeding, as well as individuals undergoing chemotherapy, should not use this product.

But that shouldn’t be the case when you are expecting. If you are pregnant or breastfeeding, it is advisable to avoid using lash growth serum, or any other eyelash product, as they can be potentially toxic to your unborn child or infant. Use the applicator to apply along the root of your brow, and sweep along the entire eyebrow.