Journal / Ingredients

What goes down the channel.

Concentrations, molecular weight, and what a number printed on a carton does and does not tell you. We publish what is in the vial. We do not translate it into a result, because that conversion is where most skincare copy stops being true.

Numbers on a carton are the most honest thing in skincare and the most misread. 210,000 ppm and 21 percent are the same figure. One of them sounds enormous, and the choice between them was made in a marketing meeting long before you saw the box.

So these entries teach the arithmetic and then draw its limit. Where an active plausibly does its work at hundreds of parts per million and where it needs percentages, why the same name at the same strength behaves differently at a different molecular weight, and why a big number near the top of an ingredient list is sometimes a warning rather than a boast.

Start here

Niacinamide, Tranexamic Acid and Peptides: What the Actives Actually DoSkincare actives explained without the promises: what niacinamide, tranexamic acid and peptides do, and what a percentage really tells you.8 min read
  1. Retinol for Beginners: Strength, Schedule, and the Adjustment PeriodRetinol for beginners: start low, around 0.1% or less, two nights a week. Strength tiers, ramp schedule, retinization, and what the trials...12 min read
  2. Exosomes in Skincare: The Claims and the EvidenceExosomes in skincare: what the published human research shows, why clinical studies pair them with in-clinic devices, and how the category is...12 min read
  3. Ceramides: What They Do, and Why a Damaged Barrier Needs ThemCeramides are the largest lipid class in the skin barrier. What the research says about ceramide levels, the lipid ratio, and ceramide...11 min read
  4. Azelaic Acid: The Quiet Multitasker for Tone and RednessAzelaic acid guide: what the clinical trials show at 10, 15, and 20 percent for rosacea, acne, and pigment, and how it...11 min read
  5. AHA vs BHA vs PHA: Which Acid Does WhatAHA vs BHA vs PHA compared: how solubility, molecular size, and formula pH decide what each acid class does, and which suits...11 min read
  6. Snail Mucin in Skincare: What the Research Actually ShowsSnail mucin, explained by the research: what snail secretion filtrate contains, what small human studies show, and where the evidence runs out.8 min read
  7. Tranexamic Acid vs Hydroquinone for Dark SpotsTranexamic acid vs hydroquinone for dark spots: mechanism, US regulatory status, safety, and what published trials report. Cited sources, no promises.9 min read
  8. Peptides vs Retinol: Different Signals, Different TolerancePeptides signal. Retinol binds nuclear receptors. Mechanism, irritation, pregnancy guidance, and why peptides fit skin right after microneedling.8 min read
  9. PDRN and Salmon DNA in Skincare: What Is ClaimedPDRN is DNA purified from salmon sperm, labeled Sodium DNA. What the research supports, what it does not, and why molecular size...11 min read
  10. Niacinamide vs Vitamin C: Which for Which ProblemNiacinamide acts on melanosome transfer. Vitamin C acts at the tyrosinase step. The pH split, the flushing myth, and how to run...10 min read
  11. High-Percentage Niacinamide: Is 20% Better Than 5%?No trial compares 20% niacinamide against 5%. What the 2 to 5 percent evidence shows, why flushing belongs to niacin, and where...14 min read
  12. Copper Peptides: The Evidence and the LimitsGHK-Cu copper peptides: what the cell, animal and human trial evidence actually shows, why they struggle to cross the barrier, and what...11 min read
  13. Acetyl Hexapeptide-8: What It Is, and Why 500 ppmAcetyl hexapeptide-8 explained: the SNAP-25 sequence it copies, why the injectable comparison breaks down, and what 500 ppm actually means on a...12 min read
  14. What Does ppm Mean in Skincare? Percent and Parts per Billionppm means parts per million, and 10,000 ppm is 1 percent. Learn the conversion and a whole genre of skincare packaging stops...7 min read
  15. Tranexamic Acid in Skincare: The 5% Ceiling Is Chemistry, Not MarketingWhy every tranexamic acid serum stops at 5 percent, how the ingredient is described to work, and the regulatory detail most brands...7 min read
  16. Peptides in Skincare: Why They Work in Parts per MillionPeptides are messages, not building blocks, and they work at hundreds of ppm. A peptide near the top of an ingredient list...7 min read
  17. Niacinamide Benefits: What It Does, and Why Most Formulas Stop at 5%The niacinamide benefits people buy it for, and the real reason the industry caps it at 5 percent. It is tolerance, not...7 min read
  18. Hyaluronic Acid and Molecular Weight: Why the Number MattersMolecular weight decides where hyaluronic acid can sit, not how well it holds water. It is also the one number almost no...7 min read
  19. Adenosine in Skincare: The Quiet Active Behind Wrinkle ClaimsAdenosine sits at 0.04 percent on hundreds of Korean cartons, rarely on the front. It is often the ingredient the wrinkle claim...7 min read

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