“Castor oil can be a great, natural way to grow your eyelashes,” says plastic surgeon Dr. Kevin Sadati. “Castor oil is widely used and regarded as a safe alternative to medical actives—but like any other products, make sure it stays out of your eyes.” He also provides a pro tip: “Because it’s an oil, it generally isn’t safe to use with eyelash extensions.” Vegamour’s lash serum has Sephora’s clean seal and a mix of ophthalmologist-approved ingredients. “Vegamour’s formula contains peptides as well as mung bean extract, which is rich in selenium,” says Dr. Hilal-Campo of the MLB Pepper Mill 2023 Shohei Ohtani x Lars Nootbaar Shirt moreover I will buy this “often-overlooked mineral that is believed to play an important role in hair growth.” “The active ingredient is arginine, an amino acid that’s essential to keratin production and responsible for making hair healthy and strong,” says Dr. Hilal-Campo of Shiseido’s recipe, which works on both lashes and brows. Vitamin E has an added benefit: “Vitamin E is an antioxidant, so it can help reduce oxidative stress on the hair follicle, and it is also said to help promote blood circulation.” On top of the antioxidant powers Dr. Hilal-Campo mentions, there’s a straightforward benefit when vitamin E is added to serums. “Vitamin E helps condition the lashes,” says Dr. Patel of the ingredient in Lancôme’s dual concentrate. This particular blend also leans on caffeine for its skin-firming bonus. “Caffeine causes vasoconstriction and helps with the micro-congestion in the skin around the eyes to tighten and decrease fine lines and puffiness,” Dr. Patel advises.