Let It Thrive: A Gentler Take on Lash & Scalp Care

TL;DR: Let It Thrive is our pumpkin-seed-and-rosemary duo for fuller, healthier-looking lashes and hair — without harsh actives. The Eyelash Serum conditions lashes (and skips the prostaglandins linked to irritation); the Hair Tonic is a lightweight leave-in that supports the look of thicker, fuller hair. Both reward consistency.

What “Let It Thrive” actually is

Two botanicals do the heavy lifting: pumpkin seed extract and rosemary — two of the most-studied ingredients in scalp and lash care. The idea is gentle, plant-based conditioning you can actually keep up with, not a harsh overnight promise.

The science behind pumpkin seed and rosemary (honestly)

We picked these two because they’re unusually well-studied for botanicals:

• Rosemary. In a 2015 randomized trial, rosemary oil performed comparably to 2% minoxidil for pattern hair loss over six months, with less scalp itch (Panahi et al., 2015). On the “why,” a 2013 study found rosemary leaf extract promoted hair regrowth in mice and inhibited 5α-reductase — the enzyme tied to hormonal hair thinning — by over 80% in lab testing (Murata et al., 2013).
• Pumpkin seed. In a 2014 randomized, placebo-controlled trial, men taking oral pumpkin seed oil saw roughly a 40% increase in hair count versus about 10% on placebo over 24 weeks (Cho et al., 2014). Its phytosterols are thought to act by inhibiting 5α-reductase, and a 2022 study of topical pumpkin seed oil reported measurable 5α-reductase inhibition and anti-hair-loss effects (Pharmaceuticals, 2022).

The honest caveat: most of this research is on scalp hair (and some is oral, or in animal and lab models), not lashes or brows. So we treat it as solid reasoning for choosing these botanicals — not a promise that our cosmetic serums grow hair, lashes or brows. Our formulas are conditioning products that support the appearance of fuller, healthier-looking lashes and hair; for medical hair loss, see a doctor.

For your lashes: Let It Thrive Eyelash Serum

A lightweight serum you line along the lash line morning and night. It conditions lashes with pumpkin seed and rosemary so they look fuller, healthier and more defined over time. Two things we’re proud of: it’s made without prostaglandins — the actives in some lash serums linked to irritation and other side effects — and it’s 100% naturally derived, vegan and paraben-free.

Honest expectation-setting: a conditioning serum cares for the lashes you already have so they look their best, so give it consistent twice-daily use and a little patience. Shop the Eyelash Serum.

For your scalp and hair: Let It Thrive Hair Tonic

A fine, leave-in scalp tonic that does its work while you do yours. Pumpkin seed extract and rosemary help the scalp feel balanced and healthy-looking while supporting the appearance of fuller, thicker-looking hair — light enough to wear daily with no greasy residue. Spray onto the scalp, massage in, and don’t rinse. Shop the Hair Tonic.

And your brows?

Sparse or over-plucked brows are the same conditioning story — pumpkin seed and rosemary are exactly the botanicals people reach for there too. Same gentle, plant-based approach, just higher up the face.

Realistic results (the honest part)

These are conditioning, plant-based formulas — think care and consistency, not miracles. Use them daily, give it several weeks, and judge by how your lashes and hair look and feel. That’s the whole brand in a line: real ingredients, real results — earned, not promised.

Let It Thrive FAQ

Do natural lash serums actually work? A conditioning serum like this doesn’t force lashes to grow the way prescription treatments claim to — it conditions and cares for the lashes you have, so with consistent use they look fuller, healthier and more defined.

What makes Let It Thrive different from other lash serums? It’s made without prostaglandins (the actives behind many lash-serum side effects), and it’s 100% naturally derived, vegan and paraben-free.

How long until I notice a difference? Give it consistent daily use over several weeks. Conditioning results build gradually — patience pays off.

Sources

• Panahi et al., Skinmed 2015 — rosemary oil vs 2% minoxidil. reference
• Murata et al., Phytother Res 2013 — rosemary leaf extract; hair growth & 5α-reductase inhibition. PubMed
• Cho et al., 2014 — oral pumpkin seed oil, randomized placebo-controlled trial. PMC4017725
• Pharmaceuticals (MDPI) 2022 — topical pumpkin seed oil; 5α-reductase inhibition & anti-hair-loss. mdpi.com

Real ingredients. Real results.