Cold-Preserved Skincare Guides & Science

A brewer in a white work coat and cap stands in the timber-beamed hall of a sake brewery in Akita, Japan, beside rows of square hatches set into the wooden floor

What Galactomyces Ferment Does for Your Skin

Galactomyces ferment filtrate is a cell-free yeast broth. What the studies show about pores, roughness and dark spots, and why it favors cool storage.

A young woman looking closely at her skin in a bathroom mirror

Is Acne Contagious? What Actually Spreads Breakouts

Liudmila Busch

Acne is not contagious: you cannot catch it from anyone. Here is why breakouts seem to spread, and the acne lookalikes that really are infections.

A cluster of small white four-petalled flowers and buds of Crambe abyssinica, the Abyssinian kale whose seeds are pressed for abyssinian oil, photographed close up in natural light

Abyssinian Oil for Skin: Light, Fast-Absorbing, and Non-Greasy

Liudmila Busch

A light, fast-absorbing face oil built on an unusual very-long-chain fatty acid. How abyssinian oil compares to argan and jojoba, and how to use it.

Three rolls of Wild Ice Chrysalis kinesiology face tape in tan on a mauve-grey surface, with strips partly unrolled to show the printed backing

Face Taping for Wrinkles: How Kinesiology Tape Works Overnight

Liudmila Busch

Face tape works mechanically: worn overnight, it holds skin smooth for the hours a pillow would crease it. What it can and cannot do, and how to apply it.

Cluster of spiny yellow-brown fruits hanging from the thorny stem of an Astrocaryum palm, the genus that gives murumuru butter

Murumuru Butter for Skin: What It Does and Who It Suits

Liudmila Busch

Murumuru butter is a solid, saturated palm-seed butter that softens and cushions skin. What it does, how it differs from shea, and who should be careful.

A young woman in a white bathrobe applies a drop of serum from a glass dropper to a cheek with a few small blemishes, in soft bathroom daylight

Purging or Breaking Out? How to Tell the Difference

Liudmila Busch

Purging tends to show up in your usual breakout zones after starting an acid or retinoid, then settle. How to tell it from a true breakout or irritation.

A woman in her sixties in a white bathrobe applies a few drops from a glass dropper to her cheek beside a bright bathroom window, the small amber dropper bottle in her other hand

Face Oil vs Serum: The Difference, and When to Use Each

Liudmila Busch

A serum is a light concentrate that carries actives; a face oil seals and softens. What each one does, which goes on first, and why some serums are oils.

A young woman with flushed cheeks sits in a pine-panelled sauna wrapped in a towel, resting a fingertip on her cheek

Do Saunas Help Acne? The 20-Minute Window

Liudmila Busch

Saunas do not open your pores, but heat pushes more oil to the surface and unsettles skin for longer than the session itself. What to do right after.

Close view of a woman's cheek with patches of melasma and dark spots

Melasma, Sun Spots, or Post-Acne Marks? How to Tell Them Apart

Liudmila Busch

Melasma, sun spots, and post-acne marks look alike, and what helps each one differs. Tell them apart by what came first, where the mark sits, and its edge.

A bottle of Cryo-C sea buckthorn and vitamin C glow serum wearing its wood overcap, standing on a wooden board in snow beside two tangerines and an orange wedge

Why Your Vitamin C Serum Turned Brown, and Whether It Still Works

Liudmila Busch

A vitamin C serum that has turned brown or amber is oxidizing and losing potency, not turning dangerous. Here is what the color means and how to slow it.

A woman's hands lift a dropper bottle of serum from a small open pink mini fridge on a white vanity beside a mirror and a face roller

Are Skincare Fridges Worth It? An Honest Look

Liudmila Busch

Cleveland Clinic calls a skincare fridge unnecessary, and cold cannot give back what heat took before you bought the bottle. Here is what to chill anyway.