Long4Lashes Eyebrow Serum is a powerful serum that contains the ability to thicken, enhance and strengthen eyebrows.. It is perfect for individuals who want to accentuate their eyebrows, thicken them, and help them grow naturally. It should be noted that this product is approved and safe for individuals who have received chemotherapy. It can also be applied on henna eyebrows as well as permanent makeup. Application: When you are ready, make sure your skin is clean and dry before you begin applying the serum utilizing the applicator. Work from the inside to the outside of the eyebrows, and also give special attention to any other areas that need it. Repeat the process each evening. Results will usually show approximately 3 weeks after regular application of the product. However, the full effect may be observed in 6 months. To maintain the progress and effects of the serum, simply use it 3-4 times per week.