The Science of Skincare
Decode active ingredients, optimize application chemistry, and protect your skin barrier. Move past cosmetic marketing to build routines that target real cellular mechanisms.
Like Duolingo, but for The Science of Skincare. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
24 levels across 4 sections, about 48 minutes end to end, roughly 10 days at five minutes a day. It moves through Tuning Your Routine for Results, Targeted Treatments and Diagnosis, Evaluating Products in the Real World, and The Biology Underneath. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in The Science of Skincare
- Low-pH acids like AHA and BHA require an acidic environment around pH 3-4 to penetrate skin cells effectively.
- Applying higher-pH or neutral toners first elevates skin surface pH and immediately blunts acid absorption.
- Bare skin right after cleansing provides the lowest surface barrier for low-pH active ingredients.
- Water-soluble actives cannot penetrate through dense, lipid-heavy occlusives like face oils.
- The standard thinnest-to-thickest rule ensures light, water-based solutions absorb before oils seal the skin.
- Heavy oils and occlusive balms form a hydrophobic film that acts as a final seal.
- Humectants attract ambient moisture, but in dry air they pull water upward from the dermis instead
- Applying humectants to damp skin provides external water for the molecule to bind
- Without an occlusive barrier to seal it in, humectants in low humidity accelerate moisture loss to the air
- Wait times are only necessary for low-pH actives like L-ascorbic acid or AHA/BHA before applying neutral products
- Neutral, pH-independent serums like peptides, niacinamide, and hyaluronic acid absorb without waiting
- Layering moisturizer over damp, non-acid serums immediately helps seal in hydration without loss of efficacy
- Low-pH acids like AHA and BHA require an acidic environment around pH 3-4 to penetrate skin cells effectively
- The sandwich method places a thin moisturizer coat both before and after a potent active.
- Buffering slows down active transdermal flux, moderating the absorption spike that triggers dermatitis.
- Humectants attract ambient moisture, but in dry air they pull water upward from the dermis instead.
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Science of Skincare the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Imagine your AHA or BHA acid standing at the doorway of your skin. What environment does it need to get to work?
Get it right to open this lesson and 23 more in the app.
How to learn The Science of Skincare, step by step
Go in order. 24 short levels across 4 sections, about 48 minutes in all, five minutes a day.
- 1
Tuning Your Routine for Results
- Strategic Layering and Sequencing
- Managing Retinoids and Cellular Turnover
- 2
Targeted Treatments and Diagnosis
- Chemical Exfoliation and Cellular Sloughing
- Hyperpigmentation and Antioxidant Chemistry
- Barrier Repair and Lipid Replenishment
- 3
Evaluating Products in the Real World
- Decoding the Ingredient Deck
- Advanced Sun Protection Selection
- 4
The Biology Underneath
- Stratum Corneum Architecture and the Microbiome
4 sections · 8 units · 24 levels. Built to play, not to enroll.
Questions about The Science of Skincare
How do I learn The Science of Skincare?
Go in order: start with Tuning Your Routine for Results, then Targeted Treatments and Diagnosis, then Evaluating Products in the Real World, then The Biology Underneath. On Tomo that's 24 short levels, about 48 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for The Science of Skincare?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. The Science of Skincare is one of its free courses, and you can type any other topic to get a course of your own.
Is The Science of Skincare free?
Yes. The Science of Skincare is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn The Science of Skincare?
24 levels across 4 sections, about 48 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start The Science of Skincare?
No. It's pitched at an intermediate level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
The Science of Skincare is taught in the Storyteller style: every lesson is a story. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Science of Skincare today.
Download Tomo, search The Science of Skincare, and play your first lesson in under a minute.