Skip to content
BEAUTYNenna BeautyNENNA BEAUTY — SKINCARE · MAKEUP · HAIRCARE

Nenna Beauty

How Sugar and Glycation Affect Skin Aging, According to Research
Wellness

How Sugar and Glycation Affect Skin Aging, According to Research

What glycation actually does to collagen, and where the anti-sugar marketing gets ahead of the evidence.

Wellness

Iron Deficiency and Hair Loss: What Ferritin Research Actually Shows

Low iron shows up on the scalp before it shows up anywhere else. Here is what ferritin testing can and cannot tell you.

01

The Edit

Considered selections, checked prices, clear disclosures.

Skincare

A woman in her fifties warms a pearl of cream between her fingers at a bright vanity, the amber dropper bottles on the shelf catching the morning light.
Skincare

What Is Actually Inside a Moisturizer, According to Barrier Research

A moisturizer is a topical formulation that hydrates and protects the stratum corneum, typically combining humectants that draw water into the outer layer with emollients and occlusive lipids that smooth and seal it. Per barrier researcher Marie Lodén's review in the American Journal of Clinical…

A woman in her twenties with freckled, texture-rich skin works a gentle foam over her cheeks at a steam-warmed bathroom sink.
Skincare

How Cleansers Actually Work, According to Dermatological Research

A cleanser is a surfactant-based formula that lifts oil, sweat and debris off the skin so they rinse away with water. In a review in the Journal of Cosmetic Dermatology, dermatologist Zoe Draelos explains that cleansers are composed of alkaline soaps or the less barrier-damaging synthetic…

A South Asian woman in her forties dabs serum onto her cheek in front of a rain-streaked window, warm lamplight catching the natural texture of her skin.
Skincare

How to Fade Dark Spots and Hyperpigmentation, According to Evidence

Dark spots fade when the trigger stops and a studied active is used patiently: the American Academy of Dermatology says many spots clear once the cause is gone, and a 2025 randomized trial in Scientific Reports found tranexamic acid plus niacinamide matched 4 percent hydroquinone for melasma…

Makeup

A woman leaning toward a window's soft daylight, one hand steady with a mascara wand near bare lashes, natural skin texture glowing in cream and terracotta light.
Makeup

Mascara and Lash Serums, Explained: What the Formulas Actually Do

Mascara is a wax-and-pigment suspension that coats lashes; lash growth serums are a different category built on prostaglandin-derived drugs first studied as glaucoma treatments. A 2025 pilot study in the Indian Journal of Plastic Surgery found a bimatoprost 0.03% formulation produced measurable…

A makeup artist in her fifties sweeps a soft peach corrector under a client's eye at a cream-lit vanity, terracotta palettes open beside the mirror.
Makeup

Color Theory for Makeup, Explained by Actual Perception Studies

Color theory in makeup uses hue relationships — contrast between features and skin, complementary shades across the color wheel — to change how a face reads, and perception research confirms the effect is real and fast. In a study published in PLOS ONE, faces with color cosmetics rated…

An East Asian woman in her twenties swatches foundation along her jawline in daylight by an open window, cream curtains and terracotta cushions behind her.
Makeup

How to Choose Foundation by Skin Type, According to Dermatology Research

Choosing base makeup by skin type means ignoring most of the front label: a systematic review by Johns Hopkins dermatologists in the Journal of Dermatological Treatment found that non-comedogenic, hypoallergenic, oil-free, and fragrance-free are marketing terms not regulated by any governing…

Haircare

A colorist in his thirties sections a client's copper-dyed curls near a window, combing oil through the ends with a gloved hand.
Haircare

How Repeated Coloring Changes Hair Fibers, According to Research

Permanent hair dye chemically restructures the hair fiber, and a 2024 study published in Heliyon quantified the cost: even a single dyeing session inflicted noticeable harm, while damage escalated significantly after three or more consecutive treatments. Using atomic force microscopy and tensile…

A Latina woman in her thirties works shampoo through her curls with her fingertips under warm bathroom light, steam softening the cream-tiled room around her.
Haircare

Scalp Care Explained: What Dermatologists Recommend for Healthy Hair

Scalp care is skin care with a delivery problem: the American Academy of Dermatology treats dandruff and flaking as a dermatological matter managed with named actives, zinc pyrithione among them, and a randomized controlled trial in Cureus in 2024 found a medicated approach performed at the…

Wellness

A woman in her sixties with silver-threaded curls applies a rich cream at her bedside in low winter light, a humidifier breathing quietly beside the window.
Wellness

How Seasons Change Skin, and a Wellness Routine That Follows

Seasons measurably change skin: a year-long Czech study found stratum corneum hydration and sebum production at their lowest in winter and hydration at its highest in spring, while a Chinese cohort found transepidermal water loss peaked in winter and dropped in summer. Both are…

A woman in her thirties with deep brown skin checks her phone by a bright window, soft daylight tracing the natural texture of her cheeks.
Wellness

What Screen Time Actually Does to Your Skin, According to Studies

Blue light is the short-wavelength end of visible light, and research dermatologists have shown it can darken skin — particularly in richer skin tones. In a study published in the Journal of Investigative Dermatology, visible light induced pigmentation that was, in the authors' words, "darker…

A woman in her fifties slices stone fruit at a kitchen table by a tall window, morning light across her bare skin and the cream-and-green breakfast spread.
Wellness

The Gut-Skin Axis Explained: What Probiotic Research Actually Shows

The gut-skin axis is a real, documented line of communication between intestinal microbes and skin, but research on changing it with products is young. A review in the journal Nutrients states that intestinal microbiota homeostasis can influence skin health, and a review in Microorganisms calls…

02

Beauty News

A woman in her forties at a recycling station by a sunlit doorway, sorting an empty glass bottle and a paper carton from a cream-toned bag.
Beauty News

EU Packaging Rules Reach Beauty Shelves: What Changes Under the PPWR

Beauty packaging in the European Union entered a new regulatory era on 12 August 2026, the application date of the Packaging and Packaging Waste Regulation, Regulation (EU) 2025/40, which the European Commission lists as in force since 11 February 2025. The regulation's headline goal is to make…

A shopper in her late twenties swatches a serum at a bright beauty counter, unbranded glass bottles lined against terracotta tones.
Beauty News

What the Sephora Olive Young K-Beauty Edit Means for Shoppers

Nineteen Olive Young-curated Korean beauty brands launched in more than 500 Sephora US stores and on sephora.com on August 20, 2026, per trade publication Cosmetics Business, the partnership's first market activation. The edit spans roughly 150 products chosen for performance, popularity and…

03

Latest Stories

A shopper in her thirties compares two serum bottles at a sunlit vanity, natural skin texture catching the window light.
Beauty News

What Circana's 2026 Beauty Sales Data Means for Skincare Shoppers

United States beauty sales reached $56.3 billion in the first half of 2026, with mass and prestige channels each growing 7 percent, according to market tracker Circana. Fragrance led all categories at 15 percent growth, per Circana's first-half data, while skincare grew 9 percent in prestige.…

A woman sectioning freshly moisturized coils before loose braids at a sunlit vanity, her hairline relaxed, warm terracotta light across her shoulders.
Haircare

How to Wear Protective Styles Without Causing Traction Alopecia

Protective styles protect the hair's ends, but tension at installation can damage the follicle itself: a review in Clinical, Cosmetic and Investigational Dermatology reports traction alopecia affects one-third of women of African descent who wear traumatic hairstyling for prolonged periods.…

A woman reading by a bright window with one hand resting over her forearm, natural skin texture in warm daylight, cream and terracotta palette with a botanical green plant nearby.
Beauty News

GlobalSkin Announces New Board Leaders and Patient-Led Research Program

GlobalSkin, the international alliance of dermatology patient organizations, announced new board leadership and a patient-led research program in its September 2026 president's letter. Tina Mesarič was re-elected, and three new directors — from the United States, Australia, and Argentina — begin…

A woman applies sunscreen at a bright window, visible pores and freckles catching natural morning light.
Skincare

A Newly Published Review Makes the Case for Antioxidants Inside Sunscreen

A review published in the November 2025 issue of Photodermatology, Photoimmunology & Photomedicine concludes that a short list of non-filtering ingredients, led by L-ascorbic acid, tocopherol, photolyase, and nicotinamide, can add protection beyond ultraviolet filters. The authors, a team led by…

A woman pressing her palms briefly over her eyes at a quiet window desk, morning light soft on unguarded skin, cream and terracotta tones grounding the frame.
Wellness

What Burnout Actually Does to Skin and Hair, Per Research

The World Health Organization defines burn-out as a syndrome "resulting from chronic workplace stress that has not been successfully managed." A review in Inflammation & Allergy Drug Targets links psychological stress to the onset or aggravation of multiple skin diseases. Burnout's visible…

A dermatologist examines a Black woman's textured hair at a window-side clinic chair, warm daylight on both faces.
Beauty News

New JAAD Research Puts Hair and Skin of Color Data Front and Center

The Journal of the American Academy of Dermatology published three papers online in August 2026: a review on laser safety in skin of color, a study of trichoscopic norms in women of African descent, and an alopecia areata management update. The lead point: in Fitzpatrick types IV to VI,…

A woman patting moisturizer onto damp cheeks beside a steamed bathroom window, soft daylight catching natural skin texture in cream and terracotta warmth.
Skincare

How to Adjust a Skincare Routine for Winter, Dermatologists Say

The core winter skin adjustment is behavioral before cosmetic: shorter, warm-not-hot showers and a heavier moisturizer on damp skin, per American Academy of Dermatology guidance. Dermatologist Elizabeth Kiracofe, MD, FAAD explains that dropping temperature and humidity make skin struggle to…

A Black woman in her thirties parts her coils at a bright window to inspect her scalp, terracotta towel on her shoulders, soft daylight on natural texture.
Haircare

What the Evidence Really Shows for Hair Growth Ingredients and Claims

Minoxidil remains the ingredient with the strongest evidence: a 2026 systematic review with network meta-analyses in the journal Medicina analyzed 23 studies and ranked topical minoxidil 5% most effective for male pattern hair loss. A Frontiers in Pharmacology review from Melbourne's…