Castéa Growth Serum

Most brow and hair serums only sit on the surface.

Castéa’s dermatologist-tested formula goes deeper — using research-backed concentrations of Rosemary, Redensyl, Anagain, and Aminexil to target the true causes of thinning: dormant follicles, poor circulation, and stressed skin.

Each active is included at the same effective levels shown in clinical studies, ensuring your follicles get the real nourishment they need for visible, consistent results.

And with our precision metal roll-on, every drop reaches exactly where it’s needed — brows, edges, or hairline — no mess, no waste, just clean, proven growth.

Yes! Here’s why Castéa works for different types of brow and hair thinning — we’re not forcing growth; we’re reactivating it naturally. Whether it’s from hormonal changes, over-plucking, stress, or aging, the root issue is the same: your follicles slow down, weaken, or go dormant.

Our serum helps restore that healthy environment around the follicles by boosting circulation, reviving dormant roots, and extending the natural growth phase — safely and effectively.

Most users begin to notice fine new baby hairs within 6–8 weeks, especially in sparse brow tails or thin hairline areas. Consistency is key — just a few seconds daily can help bring those quiet follicles back to life.

Absolutely — Castéa is dermatologist-tested and safe for daily use.

It’s made with gentle, plant-based actives — Redensyl, Rosemary, Anagain, and Aminexil — and contains no minoxidil, no hormones, and no harsh chemicals that can cause irritation or “shedding phases.”

While products like minoxidil work by chemically forcing follicles to grow (often causing dryness, redness, or rebound hair loss if you stop), Castéa takes a natural, science-backed approach. It nourishes and reactivates follicles using research-level concentrations of ingredients proven to improve density and reduce shedding — all without disrupting your skin barrier.

You can apply it confidently every day — no tingling, no flakes, no mess.

Most users notice calmer skin and less shedding within the first few weeks, as the formula helps restore balance and strengthen each follicle from the root up.

We get it, waiting for regrowth can be frustrating, especially when you’ve already tried so many things.

Here’s the realistic timeline: most users start noticing less shedding or breakage within 4 weeks, and early baby hairs (especially along the brow tails or thinning edges) often appear around 4-6 weeks of consistent use.

Because hair grows in natural cycles, fuller visible results typically develop over 3–4 months — that’s how long it takes for new hairs to strengthen and fill in.

The good news is: once those first fine hairs start showing, you’ll know Castéa’s active blend is working — and each week after, your brows and hairline will continue to look thicker, healthier, and more defined.

Think of Castéa like a workout for your follicles — you maintain your results by keeping up the routine.

Hair growth is a continuous process, and consistency helps keep your follicles active and healthy. That said, the new hairs you’ve regrown won’t suddenly vanish if you stop; they’ll just gradually return to their natural cycle over time.

Most users apply Castéa daily for about 4–6 months to reach their desired fullness, then maintain results with 3–4 applications per week. The precision roll-on makes it effortless — just a few seconds a day, like brushing your brows or applying moisturizer.

Definitely!

Castéa comes with a 90-day money-back guarantee because we're confident in our formula. If you're not satisfied for any reason, simply contact us for a refund.

Here's what we recommend: use it consistently for a full 90 days (it only takes 10 seconds a day), and if you don't notice less shedding, stronger brows, or visible new growth, get your money back.

Here’s what we recommend: apply it daily for the full 90 days (it only takes a few seconds each morning). Most users start seeing fine new hairs by week 4–6, which keeps them motivated to stay consistent.

But honestly, most people see promising signs by week 4, which gives them the confidence and motivation to continue for the best results.