GrowPotion Fluffy Brow + Lash Boosting Serum

Kosas GrowPotion Fluffy Brow + Lash Boosting Serum is one serum for two jobs: fuller, feathery-looking brows and longer, thicker-looking lashes. Peptides and vegan keratin do the work, and a dual-sided applicator means a single dip covers both brow and lash line.

What it actually does

• Boosts the look of length and thickness. A trio of peptides targets the appearance of longer lashes and denser brows.
• Fortifies with vegan keratin, which Kosas describes as supplying the building blocks of healthy-looking hair, plus provitamin B5 for smoothness and shine.
• Hydrating, mostly naturally derived base. The brand states the formula is 97 percent naturally derived and powered by hyaluronic acid.
• Gentle by design. It is ophthalmologist tested, prostaglandin-free, and the brand says it is safe for sensitive eyes.
• Brand-run studies: in a 12-week expert-graded study of 29 subjects, Kosas reports 97% showed measured improvement in brow length and lash volume; in a parallel consumer study, 90% agreed it restored the look of overplucked or misshapen brows. The brand notes results vary, and brows tend to respond before lashes because hair cycles differ.

How to use

1. Apply nightly to a clean, dry face.
2. Sweep the flatter side of the applicator across the whole brow area.
3. Tilt the pointed tip to trace along the upper lash line at the roots — skip the inner corners, the waterline and the bottom lashes (treating the top line covers the lower lashes too).
4. One dip of serum per brow and per lash line is enough; let it dry one to two minutes and hold off on makeup straight after.
5. Stay consistent — Kosas recommends daily use for 12 weeks for best results. Skipping days just delays them.

Questions

How long until I see a difference?

Kosas built its studies around 12 weeks of consistent nightly use. Expect brows to show change sooner than lashes — the brand notes the two have different hair growth cycles. Results vary person to person.

Is it safe around sensitive eyes?

The formula is ophthalmologist tested and prostaglandin-free, and the brand states it is safe for sensitive eyes. Still, keep it away from the inner-eye corner and never apply inside the waterline.

One product for both brows and lashes — how?

The applicator is two-sided: a flatter paddle to coat the brow area and a pointed tip angled for the upper lash line. A little goes a long way — one dip per brow and per eye.

Is the packaging recyclable?

Yes — Kosas says the product comes in recyclable packaging. When it's finished, throw away the cap with the stem and doe-foot, clean the bottle and recycle it. The formula itself is listed as vegan, gluten-free and cruelty-free.

Delivery, payment and returns?

Delivery takes 3 to 21 working days, depending on availability. We accept credit card, debit card, Instapay and mobile wallets — no cash on delivery. Returns are for defective, damaged or expired items only, reported within 1 day of delivery, refunded to the original payment method within 15–30 days.