Feel1

Skin Journal

Evidence-led guides to the ingredients we formulate with. Written to be useful whether or not you buy anything from us: what each one does, what it doesn't, and how to use it.

28 guides Beef tallowPDRN & K-beautyPeptidesLashes & browsRoutine & skin over 50
Woman in her early sixties with reading glasses dabbing a tiny amount of serum on her inner forearm for a patch test

Latest · lashes

Eyelash Serum for Sensitive Eyes: What to Choose and How to Start

Dry eyes, contact lenses, allergies or a past reaction: which ingredients to skip in a lash serum, a 7-day patch test with a slow start, and a routine for lens wearers.

19 September 2026 · 9 min read

Start here

  1. 1 Beef Tallow for Skin: What It Actually Does to Your Face
  2. 2 What Is PDRN? Korea's Salmon-DNA Skincare, Explained
  3. 3 Copper Peptides: What the Research Actually Shows
  4. 4 Lash Serums Without Prostaglandins: Why It Matters

Beef tallow

What rendered fat actually does on skin, where it helps, and where it stops.

5

A woman in her sixties warming balm between her palms in her back garden in low evening sun Beef Tallow for Skin: What It Actually Does to Your Face Tallow is one of the fastest-growing skincare searches in the world. What it does on a face, what it doesn't,... 9 min read Cracked winter hands rinsing under an outdoor garden tap in cold light Beef Tallow for Eczema, Cracked Hands and Winter Skin Why winter dries skin out faster than anything can replace, what a heavy balm actually does about it, and where... 5 min read Does Beef Tallow Clog Pores? The Comedogenic Question, Answered Does Beef Tallow Clog Pores? The Comedogenic Question, Answered Beef tallow has no official comedogenic rating. Here is what its fatty acid profile actually means for oily skin —... 5 min read Three creams smeared side by side on a white plate showing how differently they behave Beef Tallow vs Shea Butter vs Ceramide Creams Three good moisturisers that work in three different ways. Which one belongs on your face depends on why your skin... 5 min read Whipped Tallow Balm: The Recipe, and Where Home Rendering Falls Short Whipped Tallow Balm: The Recipe, and Where Home Rendering Falls Short Making it yourself is doable, cheap, and teaches you more about tallow than any article. Here is the method —... 5 min read

PDRN & K-beauty

Salmon DNA explained: the clinic version, the jar version, and the honest difference.

8

Feel1 PDRN cream jar next to a plain glass dropper bottle of serum on a steamy bathroom shelf PDRN Serum vs PDRN Cream: Which Format Do You Need? A practical guide to PDRN formats: when a serum makes more sense, when a cream does, how to layer them... 9 min read Woman in her late forties sitting on the edge of her bed at night pressing a pink gel cream into her cheek How to Use PDRN With Retinol: A Week-by-Week Routine A week-by-week plan for starting or restarting retinol with a PDRN cream as the buffer: how many nights, how to... 9 min read Woman in her early fifties taking a bathroom mirror selfie while touching a dry patch on her cheek PDRN Benefits for Skin: What It Helps With, Concern by Concern What PDRN can realistically do for dry, reactive, mature and retinoid-tired skin, how strong the evidence is for each, and... 9 min read Open jar of Feel1 PDRN Collagen Under-Eye Patches on a tiled bathroom shelf, chrome lid leaning behind it PDRN Eye Patches: What They Are and What They Actually Do PDRN eye patches hold salmon-derived Sodium DNA against the under-eye for twenty minutes. What that changes versus a cream, how... 9 min read A woman in her forties resting her head against a train window on an overcast day What Is PDRN? Korea's Salmon-DNA Skincare, Explained What PDRN is, how it is thought to work, and the honest difference between the clinic injection and the cream... 7 min read A woman waiting alone in a row of chairs in a clinic waiting area under fluorescent light Salmon Sperm Facial vs PDRN Cream at Home: Cost, Downtime, Results One costs several hundred per session and needs a clinic. The other lives on your shelf. The honest comparison, including... 5 min read A woman standing backlit in a hallway near a frosted glass front door Dark Circles, Hollows or Puffiness — Which One Do You Actually Have? Three different problems wear the same face. Two minutes in front of a mirror tells you which one you have. 4 min read A woman sitting on an unmade bed wearing hydrogel eye patches, photographed with direct flash Do Under-Eye Patches Actually Work? A Straight Answer For puffiness and dehydration, yes, within twenty minutes. For pigmentation and hollowing, no — and no patch will change that. 11 min read

Peptides

Copper, collagen and what forty years of research does and doesn't support.

3

A woman in her late fifties squinting into hard midday sun on a coastal footpath Copper Peptides: What the Research Actually Shows Copper peptides have forty years of published research and a reputation that runs ahead of it. What is supported, what... 5 min read A woman with wet hair examining her cheek in a gym changing room mirror under fluorescent light Peptides vs Retinol: Which One Do You Actually Need? Retinol has the better evidence. Peptides have the better tolerability. For skin that has already reacted badly once, the second... 4 min read Can You Use Copper Peptides With Vitamin C? Can You Use Copper Peptides With Vitamin C? Short answer: not in the same layer. Vitamin C in the morning, copper peptides at night — and you keep... 4 min read

Lashes & brows

Growth cycles, prostaglandins, and what actually grows back.

5

Close-up progress selfie of one eye and eyebrow by a window, natural short lashes without mascara How to Use Eyelash Serum for Growth: Step by Step The application routine from the people who make one: prep, one stroke along the upper lash line, brows, progress photos... 9 min read A woman in her sixties waiting in a hairdresser's chair, no makeup, sparse pale lashes Lash Serums Without Prostaglandins: Why It Matters Most lash serums that visibly work contain a prostaglandin analogue. What that does, why it is worth avoiding, and what... 6 min read A woman checking her lashes in the rear-view mirror of a parked car in a supermarket car park How to Grow Eyelashes: Castor Oil, Peptides and What Actually Works Lashes cannot be made to grow faster. They can be stopped from breaking, and that is where the visible difference... 5 min read A woman in her seventies sitting in a bay window on an overcast day with a cat beside her Why Your Lashes Get Thinner After 45 It is not your imagination and it is not the mascara. The lash cycle changes with age, and three ordinary... 4 min read A woman brushing her eyebrow at the mirror of an office toilet under fluorescent light How to Grow Eyebrows Back After Over-Plucking Thirty years of plucking leaves a mark. Some of it grows back, some does not — and knowing which saves... 5 min read

Routine & skin over 50

Order, barrier, menopause — the unglamorous parts that make the difference.

6

Woman in her fifties pouring coffee in a kitchen at dawn with pink hydrogel patches under her eyes When to Use Eye Patches: Morning or Night? Morning for puffiness, evening for a longer active window — always after cleansing and before serum or cream. Fridge, makeup,... 9 min read Woman in her forties taking a mirror selfie in an office washroom with pink hydrogel patches under her eyes Eye Patches vs Eye Cream: Which One Do You Actually Need? Eye cream is the daily habit; eye patches are the twenty-minute event. A fair comparison by criteria, when to choose... 9 min read A woman mid-routine in a bathroom with hard afternoon sun cutting a stripe across her face A 4-Step Skincare Routine for Skin Over 50 Four steps, four products, ten minutes a day — because skin over fifty responds better to a few things done... 4 min read A woman sitting on the back step of a house with a mug of tea in low evening sun Menopause Skin: Dryness, Itching and the Collagen Drop Around 30% of skin collagen is lost in the first five years after menopause. That is why everything changed at... 4 min read Damaged Skin Barrier: Six Signs and the Two-Week Repair Damaged Skin Barrier: Six Signs and the Two-Week Repair If your skin stings when you apply things it used to tolerate, that is a barrier you have broken —... 5 min read Skincare Layering Order: What Goes First (and What Never Mixes) Skincare Layering Order: What Goes First (and What Never Mixes) The rule is one sentence long: thinnest to thickest, water before oil. Everything else is the reasoning and the exceptions. 4 min read

New guides, roughly twice a month

We write these when we have something worth saying, not on a schedule. Leave your email and we'll send the next one.

No offers, no reminders. Unsubscribe in one click.