New, never open , Skin Research Laboratories neuLASH Lash Enhancing Serum Expiration 12 months after being opened. eyelash enhancing serum Get the lash line of your dreams with neuLASH. Ophthalmologist tested, this non-irritating lash enhancement gem delivers beautiful lashes in as little as 4 weeks. The neuLASH formula offers superior results, giving the appearance of healthier, stronger lashes without irritation. Nutrient rich formula Safe and effective. Suitable for women and men.