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State of evidence · Updated Jul 14, 2026

Skin & Aging

Retinoids, GHK-Cu, collagen, hair loss and dermal-repair trials.

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Jul 14, 2026Last update
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5 Strong claims29 Moderate claims20 Emerging claims16 Weak claims11 Hype claims
Latest finding · Jul 14, 2026

Azelaic Acid: Does It Work for Rosacea & Acne?

Azelaic acid is one of the quietest workhorses in dermatology — not trendy, rarely hyped, and yet it carries a genuinely strong hand across three separate problems.

1 Strong4 Moderate1 Hype
2026
Jul 13, 2026

Ceramides for Skin: What the Evidence Shows

Ceramides are the ingredient of the moment — splashed across cleansers, creams, and serums with the promise of a “repaired barrier” and, increasingly, of turning back the clock.

1 Strong3 Moderate1 Emerging1 Weak
Jul 12, 2026

Tretinoin vs Copper Peptides: Which for Skin?

Put these two side by side and you are really comparing two different philosophies of skincare. Tretinoin is the prescription heavyweight — a vitamin-A derivative with decades of randomized trials, FDA approval for photoaging, and a genuine ability to rebui…

1 Strong2 Moderate2 Emerging1 Hype
Jul 11, 2026

Mineral vs Chemical Sunscreen: Which Is Better?

Two camps, one endless argument. On one side, mineral sunscreens built on zinc oxide and titanium dioxide, sold as the “clean” choice. On the other, chemical filters like avobenzone and oxybenzone, dogged by headlines about hormones and blood absorption.

2 Strong1 Moderate1 Weak1 Hype
Jul 07, 2026

Hyaluronic Acid Serums: Do They Work?

Hyaluronic acid is the most reached-for ingredient in modern skincare, and for once the popularity is partly earned.

2 Moderate1 Emerging1 Weak1 Hype
Jul 02, 2026

Copper Peptides: Do the Skin Serums Deliver?

Copper peptides — the blue-tinged GHK-Cu serums — and signal peptides like Matrixyl are sold as collagen powerhouses that outperform retinol without the sting.

3 Emerging2 Weak
Jun 22, 2026

Salmon Sperm DNA Skincare: Does PDRN Work?

PDRN — polydeoxyribonucleotide, the “salmon sperm DNA” ingredient that has racked up well over a million TikTok posts a week — is sold as a regenerative miracle for skin healing, elasticity and youthful glow.

2 Moderate1 Emerging1 Weak
Jun 18, 2026

Skin Cycling: Is the Viral 4-Night Routine Better?

Skin cycling is everywhere — a tidy four-night rotation (exfoliate, retinoid, recover, recover) that a board-certified dermatologist coined and then watched explode on TikTok. The temptation is to treat it as either a breakthrough or a gimmick. It is neither.

2 Moderate1 Emerging1 Weak1 Hype
Jun 14, 2026

Copper Peptides for Hair Growth: Does It Work?

Copper peptide serums — GHK-Cu and copper tripeptide-1 — have become the breakout ingredient of the “natural” hair-loss aisle, sold for thickness, regrowth, and as a gentler stand-in for minoxidil.

1 Moderate1 Emerging1 Weak2 Hype
Jun 10, 2026

Snail Mucin for Skin: Does the K-Beauty Hero Work?

Snail mucin — snail secretion filtrate, the slick essence that went viral on TikTok and built half the modern K-beauty shelf — is marketed for hydration, repair, fine lines, fading acne scars, and the elusive “glass skin.” The honest read sits between the h…

2 Moderate1 Emerging1 Weak1 Hype
Jun 05, 2026

Bakuchiol: Does the “Natural Retinol” Work?

Bakuchiol is the breakout ingredient of gentle skincare — a plant-derived compound marketed as a “natural retinol” that promises the wrinkle-smoothing, pigment-fading benefits of a retinoid without the peeling, redness, and sting.

2 Moderate2 Emerging1 Hype
Jun 02, 2026

Niacinamide for Skin: What It Actually Does

Niacinamide is on the ingredient list of half the serums in your bathroom, and most of the time it is doing far less than the packaging implies.

2 Moderate2 Emerging1 Weak
May 28, 2026

Collagen Peptides 2.5g/Day: What 2026 Skin Trials Show

A new Molecules mechanism paper maps how oral collagen peptides reach dermal fibroblasts and switch on lysosomal autophagy and mitochondrial biogenesis. Useful biology — but it doesn't change the dose conversation.

May 18, 2026

Glutathione: Liver, Skin, Fertility

Glutathione is the most-marketed and most-misunderstood antioxidant in the supplement aisle. The strongest argument for it isn't skin lightening — it's liver biochemistry.

Apr 05, 2026

Zepbound + Taltz: 31x Higher Psoriasis Remission in Phase 3b

Eli Lilly's TOGETHER-PsO and TOGETHER-PsA trials asked a pointed question: what happens when you add tirzepatide — the GLP-1/GIP dual agonist sold as Zepbound — to an IL-17A biologic in patients with psoriatic disease and obesity? In psoriatic arthritis, co…