Best Supplements for Fuller Lashes & Brows

The one strongly-evidenced eyelash-growth treatment — a prescription prostaglandin-analog drug (Latisse 0.03%) applied to the upper lash line, not a cosmetic. Randomized vehicle-controlled trials and a meta-analysis show it reliably lengthens, thickens, and darkens lashes by prolonging the hair-growth (anagen) phase. The honest framing: it genuinely works, but it's a drug with real trade-offs — the benefit fully reverses within a few months of stopping, and it carries ocular/periorbital side effects (eye redness, eyelid and iris darkening, and hollowing of the upper eyelid from fat atrophy, which can be disfiguring and sometimes irreversible). It doesn't help all causes of lash loss (e.g. alopecia areata). Use under a clinician.

Over-the-counter eyelash/brow 'growth' serums — distinct from prescription bimatoprost. The honest framing is mostly a warning: the genuinely inert cosmetic formulas (peptides, panthenol, biotin) have very little proof of benefit — one small, uncontrolled, manufacturer-run trial — while a large share of marketed 'cosmetic' lash serums quietly contain unapproved prostaglandin drugs (bimatoprost, norbimatoprost, isopropyl cloprostenate). Those work, but they carry the same ocular and periorbital side effects as the prescription drug — iris darkening, hollowing of the eyelid from fat atrophy, and skin pigmentation — without disclosure or medical oversight. If a cosmetic lash serum 'really works,' it may contain an undeclared drug. Read ingredient lists carefully.