Trinsic is a UK-based beauty brand creating science-led lash and brow products. Our current range includes a Natural Lash Serum, a Natural Brow Serum, and an Enhancing Brow Gel — each formulated with clinically studied actives and no harsh additives. All products are prostaglandin-free, vegan, and made in the UK.

All Trinsic products are formulated without synthetic fragrances, prostaglandins, parabens, or sulphates. Full INCI ingredient lists are printed on every product and published on each product page.

Yes. All Trinsic formulations are designed for the sensitive periocular area. We avoid prostaglandins, synthetic fragrances, sulphates, and harsh preservatives, and include soothing actives such as aloe vera, chamomile, and allantoin.

If you have a history of contact dermatitis, eczema around the eye area, or known cosmetic allergies, we recommend a patch test on the inner wrist 24 hours before first use.

Trinsic products do not contain prostaglandins, retinoids, or other ingredients with known pregnancy contraindications. As with any cosmetic applied near a mucous membrane, we recommend consulting your GP or midwife before use during pregnancy or while breastfeeding.

Absolutely. Trinsic products are for everyone — the Brow Serum is particularly popular with men looking to add density to patchy or sparse brows. The lightweight formula is invisible on skin with no residue or tint. The Brow Gel is ideal for daily grooming and hold.

Each product carries a batch number, Best Before End (BBE) date, and Period After Opening (PAO) symbol on both the product and outer packaging. The PAO is 6 months from first opening. Store away from direct sunlight, heat, and moisture.

Lashes grow in natural cycles — the serum extends the active growth phase, so results build progressively:

Results vary with age, genetics, and lash health. Consistent daily use is the single most important factor.

The Trinsic Natural Lash Serum uses 36 active ingredients in a prostaglandin-free complex, including:

Peptides signal follicles to produce keratin. Biotin supports keratin synthesis. Castor oil conditions and reduces breakage. Hyaluronic acid creates a moisture barrier. Caffeine stimulates microcirculation around the follicle.

Apply to clean, dry lashes using the precision applicator — a single thin stroke along the upper lash root from outer to inner corner. Allow 1–2 minutes to dry before applying makeup or lying down.

When to apply: We recommend applying at night as the final step of your evening routine for maximum absorption. The serum can also be used in the morning under makeup — allow it to dry fully before mascara or other eye products.

Once daily is all that is needed. The serum can be used up to twice daily — morning and night — but this will not accelerate the growth cycle. Night-time is recommended for maximum absorption.

Your lashes will not fall out. The conditioning benefits mean lashes continue to look healthier and fuller than before you started — they simply won't maintain full growth-phase results without continued support. Over approximately 2–4 months, new lashes gradually return to their natural pre-serum rate.

After week 12, reduce to 3–4 times per week to maintain results long-term with minimal product use.

Under makeup: Yes. Allow 1–2 minutes to dry before applying mascara or other eye products. The serum acts as a conditioning base that reduces brittleness from daily makeup wear.

After a lash lift or tint: Wait 48 hours before resuming serum use to allow the lift to set.

With lash extensions: Yes. Apply carefully along the lash root skin, avoiding the adhesive bond. Keeping natural lashes strong reduces shedding and extends the life of extensions.

Yes. Remove contact lenses before applying and wait at least 15 minutes before reinserting.

Some crossover benefit is possible as the serums share the same core active complex. However, for best brow results we recommend the dedicated Trinsic Brow Serum — it has a wider applicator designed for the full brow arch and a richer texture to penetrate coarser brow hairs more effectively.

With twice-daily use, a standard bottle lasts approximately 6–8 weeks. With once-daily use it lasts longer. Once you switch to the maintenance routine (3–4× per week), the same bottle lasts considerably longer still.

The Trinsic Natural Brow Serum is designed to stimulate growth, increase density, and strengthen brow hairs in sparse, patchy, or over-plucked areas. It is suitable for anyone experiencing thin or patchy brows — whether from over-waxing, threading, hormonal changes, ageing, or stress. Effective for all hair and skin types, and all genders.

Brow hairs grow more slowly than lashes — patience and consistency in the first 12 weeks are key.

Apply to clean, dry brows using the brush applicator — stroke in the direction of hair growth from inner to outer brow, focusing on patchy or sparse areas. One thin pass per brow is sufficient.

When to apply: Night-time is recommended for maximum absorption. The serum can also be used in the morning under makeup — allow 1–2 minutes to dry before applying brow products or the Trinsic Brow Gel.

Once daily is sufficient. Can be used up to twice daily, but this will not speed up the growth cycle.

Your brows will not fall out. The conditioning benefits mean brows continue to look healthier and fuller than before you started. Full growth-phase results require continued use to maintain — over 2–4 months, new hairs gradually return to their natural pre-serum rate. After your 12-week growth phase, switch to 3–4 times per week to sustain results long-term.

After microblading: Wait until fully healed — typically 4–6 weeks — before applying any serum.

After brow lamination: Wait 48 hours after treatment before resuming use. Using Trinsic between appointments helps keep natural brow hairs conditioned and reduces damage from repeated chemical treatments.

The Trinsic Enhancing Brow Gel does two jobs at once: it holds brow hairs in place throughout the day with a defined, groomed finish — while actively delivering growth-supporting actives including peptides, biotin, and castor oil to the follicle. It is not just a styling product; it works while you wear it.

The Trinsic Brow Gel is clear only — there are no tinted versions. This makes it suitable for all brow colours and works seamlessly over any existing brow makeup without altering the colour.

During the day: Apply over your normal brow makeup — or on bare brows — as the finishing step of your morning routine. Stroke through brow hairs in an upward motion from root to tip. Apply a second coat before the first dries for a stronger hold.

At night: Can also be used at night after the Brow Serum has fully absorbed, layering growth actives while you sleep.

Yes — allow the Brow Serum to absorb fully first (1–2 minutes) before applying the Brow Gel. Layering gel directly over wet serum prevents the actives from penetrating the skin effectively.

The Brow Gel removes easily with your regular facial cleanser or micellar water. No specialist eye makeup remover needed. Once brows are clean and dry, apply the Brow Serum as the final step of your nighttime routine.

Trinsic products are available directly at trinsic.com, where you'll find the full range, current stock, and exclusive multi-buy bundles for the best value when purchasing multiple products. Selected products are also available via Amazon UK, Amazon EU, and Amazon USA. We recommend purchasing from trinsic.com or authorised Amazon storefronts to ensure genuine products within their recommended shelf life.

We currently ship to the UK and EU. Here's a full breakdown:

🇬🇧 UK Shipping
Free on orders over £49. Orders under £49 are charged at a flat rate. Estimated delivery 2–4 business days.

🇪🇺 EU Shipping
Free on orders over €54. Orders under €54 are charged at a flat rate. Estimated delivery 1–5 business days.

We ship to: Austria, Belgium, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Guernsey, Hungary, Ireland, Italy, Jersey, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, and Sweden.

Yes. Trinsic offers a subscribe & save option on all core products, with a discount applied to every order. You can pause, modify, or cancel at any time from your account. Subscribing ensures you never run out mid-growth phase.

We offer a 90-day satisfaction guarantee. If you're not completely happy with your purchase, contact us for a full refund — no questions asked. Visit our Returns & Refunds page for full details, or email [email protected].