OBAGI - NU-CIL® Eyelash Enhancing Serum

OBAGI NU-CIL® Medical-Grade Eyelash Enhancing Serum OBAGI NU-CIL® Eyelash Enhancing Serum is a clinically developed, medical-grade lash serum formulated to visibly increase eyelash length, density, and fullness. Powered by a proprietary peptide-rich complex and nourishing botanical actives, NU-CIL® works at the follicular level to extend the natural lash growth cycle — delivering measurably longer, thicker, and darker lashes without the hormonal side effects associated with prostaglandin-based alternatives. Developed by OBAGI Medical — a brand trusted by dermatologists and aesthetic clinicians worldwide for over 35 years — NU-CIL® represents the gold standard in non-prescription lash enhancement. What NU-CIL® Delivers Visibly longer lashes — targets the anagen (active growth) phase to extend lash length over time Increased density & fullness — supports thicker-looking lashes from root to tip Darker, more defined appearance — enhances natural lash pigmentation Prostaglandin-free formula — no risk of iris pigmentation changes or periorbital fat loss associated with prescription lash treatments Suitable for sensitive eyes — ophthalmologist-tested and contact lens-friendly Visible results from 4–6 weeks — with optimal results typically seen at 12–16 weeks of consistent use How OBAGI NU-CIL® Works: The Science Eyelash growth follows a cyclical pattern: the anagen phase (active growth), the catagen phase (transition), and the telogen phase (resting/shedding). Most people naturally spend only 30–45 days in the anagen phase — limiting how long lashes can grow. NU-CIL® is formulated to extend the anagen phase and nourish the follicle during this window, resulting in lashes that grow longer before shedding. The formula combines: Myristoyl Pentapeptide-17 — a biomimetic peptide that stimulates keratin gene expression within the hair follicle, directly supporting lash fibre production and elongation Myristoyl Hexapeptide-16 — works synergistically with Pentapeptide-17 to enhance follicular activity and improve lash anchoring strength Biotin (Vitamin B7) — an essential co-factor in keratin synthesis; deficiency is directly linked to lash thinning and brittleness Panthenol (Pro-Vitamin B5) — deeply conditions the lash shaft, reducing breakage and improving flexibility and shine Swertia Japonica Extract — a botanical active shown to stimulate follicular stem cells and support the transition from telogen back into anagen phase Hyaluronic Acid — maintains optimal hydration at the follicular environment, supporting healthy lash emergence and reducing lash loss due to dryness Unlike prostaglandin analogues (found in prescription treatments such as bimatoprost), NU-CIL® achieves its results through follicular nourishment and peptide signalling — making it safe for long-term daily use without the systemic or ocular risks associated with prescription alternatives. Why Prostaglandin-Free Matters Prescription lash serums containing prostaglandin analogues (e.g. bimatoprost, isopropyl cloprostenate) can cause well-documented side effects including: Permanent darkening of the iris (heterochromia) in susceptible individuals Periorbital fat atrophy — a sunken appearance around the eye socket Eyelid skin darkening (periorbital hyperpigmentation) Increased intraocular pressure — a concern for those with glaucoma risk OBAGI NU-CIL® delivers clinically meaningful lash enhancement without any of these risks, making it the preferred choice for patients who want results without compromise — and the recommendation of choice among aesthetic clinicians for long-term maintenance. How to Use OBAGI NU-CIL® Eyelash Serum Ensure the eye area is clean and free of makeup, contact lenses, and other eye products Using the precision applicator brush, apply a single thin line of serum along the upper lash line — as close to the lash root as possible — as you would apply eyeliner Allow to absorb fully before applying other products or reinserting contact lenses Apply once daily, preferably in the evening Do not apply to the lower lash line or directly into the eye Continue use consistently for a minimum of 12–16 weeks for optimal results; maintenance use is recommended to sustain results Pro tip: Results are cumulative. Discontinuing use will gradually return lashes to their pre-treatment state as the natural growth cycle reasserts itself — consistent use is key. Who Is OBAGI NU-CIL® Suitable For? NU-CIL® is suitable for adults who: Have naturally short, sparse, or thin lashes and want visible enhancement without extensions Have experienced lash thinning due to age, hormonal changes, or nutritional deficiency Are seeking a safe, long-term alternative to prostaglandin-based prescription lash serums Wear contact lenses (contact lens-compatible formula) Have sensitive eyes or have experienced irritation with other lash serums Are maintaining results following a course of prescription lash treatment Not recommended for: use during pregnancy or breastfeeding without medical advice; individuals with active eye infections or inflammation; those under 18 years of age. Product Details Brand OBAGI Medical Product NU-CIL® Eyelash Enhancing Serum Size 3 ml Formula type Prostaglandin-free peptide serum Application Precision brush applicator Frequency Once daily (evening recommended) Visible results 4–6 weeks; optimal at 12–16 weeks Ophthalmologist tested Yes Contact lens safe Yes (remove lenses before application) Prescription required No Frequently Asked Questions How long does OBAGI NU-CIL® take to work? Most users notice initial improvements in lash length and fullness within 4–6 weeks of consistent daily use. Optimal, full results are typically achieved at 12–16 weeks. Results are cumulative and depend on consistent application — skipping applications will slow progress. Is OBAGI NU-CIL® safe for contact lens wearers? Yes. NU-CIL® is formulated to be contact lens-compatible. Remove contact lenses before applying the serum and wait at least 15 minutes before reinserting them. Does OBAGI NU-CIL® contain prostaglandins? No. OBAGI NU-CIL® is completely prostaglandin-free. It achieves lash enhancement through a peptide and botanical complex rather than prostaglandin analogues, eliminating the risk of iris colour change, periorbital fat loss, or increased intraocular pressure associated with prostaglandin-based serums. What happens if I stop using NU-CIL®? Lashes will gradually return to their natural pre-treatment state as the growth cycle reasserts itself — typically over 4–8 weeks after discontinuation. To maintain results, continued use is recommended. Many users transition to every-other-day application as a maintenance dose once optimal results are achieved. Can I use NU-CIL® on my eyebrows? NU-CIL® is specifically formulated and tested for eyelash use. While some users apply it to sparse brow areas, this is an off-label use. Consult your skincare professional for brow-specific treatment recommendations. How does OBAGI NU-CIL® compare to prescription lash serums? Prescription lash serums (such as those containing bimatoprost) work via prostaglandin pathways and can produce dramatic results, but carry documented risks including iris pigmentation changes and periorbital fat atrophy. OBAGI NU-CIL® uses a peptide-based mechanism that is safer for long-term use, suitable without a prescription, and preferred by many clinicians for maintenance therapy or for patients who cannot tolerate prostaglandin side effects. Is OBAGI NU-CIL® suitable during pregnancy? Use during pregnancy or breastfeeding is not recommended without prior medical advice. Please consult your GP or obstetrician before use if you are pregnant, planning a pregnancy, or breastfeeding. Why Buy OBAGI NU-CIL® From a Clinician-Backed Retailer? OBAGI products are professional-grade formulations designed for use under clinical guidance. Purchasing from an authorised, clinician-backed retailer ensures you receive: Authentic, UK-sourced product — not grey-market or counterfeit stock Expert guidance on integrating NU-CIL® into your wider skincare or treatment protocol Correct storage and handling — maintaining product integrity and efficacy Access to professional advice if you experience any unexpected reactions Counterfeit and grey-market OBAGI products are a known issue in the UK market. Always verify you are purchasing from an authorised OBAGI stockist.