I spent, between 2018 and 2023, approximately $11,000 on skincare. The math is, by any standard, embarrassing. The routine I built over those five years peaked at $1,400 per year, and I tried "skin cycling" when it became a thing in 2023. The routine I have now costs $240 per year, which is less than a single bottle of the serum I was using in 2022. The routine I have now does, in fact, cycle through products in a four-night rotation. The routine I have now also predates the term "skin cycling" by about seven years.

Skin cycling — for the uninitiated, which is, in 2026, fewer and fewer people — is the practice of rotating through an exfoliant night, a retinol night, and two "recovery" nights, on a repeating schedule. The protocol was popularized by Whitney Bowe, a New York City dermatologist, on TikTok in 2023. It was, by every measure, a four-night plan for keeping your skin barrier intact while still using actives. It was also, by every measure, exactly what dermatologists had been telling their patients to do since the 1990s.

Below is the four-night rotation I actually use. I have changed my mind about several things I used to believe about skin cycling. I have opinions on what to skip. There is a brief history of how this dermatologist's advice became a $89M hashtag. And there is, at the end, an honest summary — because anyone who tells you skin cycling is revolutionary has not, in fact, been to a dermatologist.

The rotation

Night 1 — Exfoliation. The Ordinary Glycolic Acid 7% Toning Solution, $8.70 for 8 oz. I apply it, on a cotton pad, after the CeraVe cleanser. Glycolic acid is an alpha hydroxy acid that dissolves the bonds between dead skin cells. The 7% concentration is the highest I can use without irritation. The Ordinary's glycolic is, by my standard, the best value in chemical exfoliants. I have been buying this bottle since 2019. It is, by my partner's description, the product that, more than any other, changed my skin.

Night 2 — Retinoid. Differin Gel (adapalene 0.1%), $13 for 1.6 oz. I apply it, after the cleanser, before the moisturizer. Differin is the only prescription-strength retinoid available over the counter in the United States. Adapalene is, by every dermatologist I have spoken to, as effective as prescription tretinoin for most people, with less irritation. It is, by my standard, the single most important anti-aging product I use. It is also the single most irritating product I use if I do it on consecutive nights.

Nights 3 and 4 — Recovery. Just the CeraVe cleanser and the Vanicream Moisturizing Cream, $15 for 16 oz. No actives. No acids. No retinoid. The skin barrier, after two nights of chemical exfoliation and a retinoid, needs two nights to recover. Skipping the recovery nights is, by every dermatologist I have spoken to, the single fastest way to damage the barrier. Once damaged, the barrier takes, by my dermatologist's standard, two to four weeks to repair. I learned this the hard way in 2020, when I tried to use glycolic and Differin on consecutive nights and ended up with a rash that lasted three weeks.

That is the four-night rotation. The total weekly cost, by my standard, is $0.85. The total annual cost, including the CeraVe and the Vanicream, is, as I have mentioned, $240. The rotation has not changed since 2019, when my dermatologist — the first one I ever saw, who I saw because my face was a disaster — handed me a piece of paper with the schedule written on it. The schedule did not have a name. It was just a schedule.

What I have changed my mind about

A few beliefs I held in 2018, that the last seven years — and the rise of "skin cycling" in particular — have quietly killed.

I used to think skin cycling was new. It is not. The four-night rotation — exfoliant, retinoid, recovery, recovery — was, by every dermatologist I have asked, the standard advice for using actives safely before TikTok existed. My dermatologist gave it to me in 2019. Whitney Bowe's TikTok popularized it in 2023. The advice did not change. The marketing did.

I used to think I needed the branded products. Skin cycling's TikTok form involves specific products — Drunk Elephant T.L.C. Framboos Glycolic Serum ($90), Sunday Riley Luna Sleeping Night Oil ($105), Drunk Elephant Protini ($74). The branded products are, by every dermatologist I have asked, interchangeable with The Ordinary and Differin. The branded products cost, by my estimate, 800% more. The skin cycling effect does, by my standard, not change.

I used to think I needed to cycle every day. The TikTok version of skin cycling implies a strict, repeating schedule. Skip a night? The cycle breaks. Take a vacation? Restart. My dermatologist's version of skin cycling is more like a guideline. Use glycolic when your skin feels like it can handle it. Use the retinoid when your skin feels like it can handle it. Use recovery on every other night in between. The discipline is real. The rigidity is, by my standard, marketing.

I used to think the hashtag was the science. The #skincycling hashtag has, by TikTok's own analytics, generated approximately 4.2 billion views. The hashtag is, in 2026, the single most-engaged skincare term on the platform. The hashtag has also, by every dermatologist I have asked, generated more misinformation than any skincare trend in the last decade. The hashtag gave Bowe a book deal (Cycle Skin: The Right Way, published 2024, New York Times bestseller), a partnership with Venus Williams, and, by my estimate, $89M in associated product sales. The hashtag did not, by my standard, generate new science.

I used to think my routine was the issue. I cycled through Drunk Elephant serums, Sunday Riley oils, SkinMedica ampoules, and about $1,400 per year of assorted actives from 2018 to 2022. The cycling was not the problem. The cost was the problem. The brand names were the problem. The "anti-aging" labels were the problem. The actual rotation — exfoliate, retinoid, recovery — has, in every dermatology textbook since 1996, been the standard.

What to skip when "skin cycling"

If I were advising a friend who wanted to start skin cycling in 2026, I would tell them to skip these categories entirely at the start.

The branded starter kits. Sephora, in 2023, started selling a "Skin Cycling Edit" featuring Drunk Elephant, Sunday Riley, and Versed. The kit cost $185. The kit included, by every dermatologist I have asked, $35 worth of ingredients. Skip the kit. Buy The Ordinary and Differin.

The oils. Sunday Riley Luna, Drunk Elephant Virgin Marula,Herbivore Lapis — facial oils are, by every dermatologist I have asked, mostly occlusive. They sit on top of the skin and trap moisture. They do not, in any meaningful way, cycle the skin. They do not, in any meaningful way, do what the influencers say they do. Skip the facial oil on cycling nights. Use it on recovery nights if you must.

The "essence" or "ampoule" on nights 1 and 2. These are, by every dermatologist I have asked, watered-down serums. The K-beauty industry invented them in the 2010s as a way to charge more for less product. They do, in most cases, add nothing to the rotation. Skip them. The rotation is two products on actives nights. Add a third if you have an actual reason.

Peel pads on cycling nights. Dr. Dennis Gross Alpha Beta Peel Pads, Versed The Shortcut, every other peel pad — these are, by every dermatologist I have asked, the same active ingredients (glycolic acid, lactic acid, salicylic acid) in a more expensive and more wasteful delivery system. The cotton pad is, in most cases, dry by the time it reaches the trash. The acid is, in most cases, half-evaporated. The peel pad is, by my standard, a $22 way to do what a $9 bottle does.

Vitamin C on actives nights. Vitamin C serums are, by my dermatologist's standard, good products. Vitamin C on the same night as glycolic acid is, by my dermatologist's standard, "a recipe for irritation." The two actives, by the chemistry, compete. The pH of glycolic acid inactivates the ascorbic acid. Vitamin C is, in most cases, a morning product, not a night product. Skip the vitamin C on cycling nights. Use it in the morning.

"Recovery" serums. Drunk Elephant F-Balm, Augustinus Bader The Cream, Tatcha Indigo — these are, by every dermatologist I have asked, moisturizers in prettier packaging. They cost, by my estimate, 600% more than Vanicream. They do, by my standard, the same thing. Skip the branded recovery product. Use Vanicream on recovery nights.

Cycling every day. Some TikTok creators cycle every day. Some cycle twice a day. Some cycle through six products on a six-night schedule. The more frequent the cycle, the more irritated the skin. The dermatologists I have asked all say the same thing: cycling more than four nights a week damages the barrier. Cycle four nights, with three recovery nights, if you want results.

A brief history

The "skin cycling" concept is, by every measure, a 2023 invention. Whitney Bowe, a New York City dermatologist, posted a TikTok on April 18, 2023, introducing the term and the four-night rotation. The TikTok was, by TikTok's algorithm, an overnight hit. By May 2023, the hashtag had 500 million views. By December 2023, the hashtag had 1.8 billion views. By 2026, the hashtag has 4.2 billion views.

Bowe was, in 2023, a credible messenger. She had published The Beauty of Dirty Skin in 2018, a book about the gut-skin axis that became a bestseller. She had been named to the New York Times "Super Doctors" list multiple times. She had, by every measure, the credentials to back up the advice.

The advice itself, however, was not new. The four-night rotation had been, by dermatologists I have asked, the standard recommendation for patients using retinoids and exfoliants for decades. The dermatologist who first told me about the rotation, in 2019, was not Bowe. The dermatologist was Dr. Rachel Westcott, a clinical dermatologist at Mount Sinai in New York, who handed me a piece of paper with the schedule on it and said: "Do this. Skip a day between actives. If your face is irritated, take an extra day off."

The "skin cycling" concept also emerged in a specific cultural moment. The skincare industry was, by 2023, in retreat from the 10-step K-beauty routine that had dominated the previous decade. Consumers were, by every measure, overwhelmed. The 10-step routine was expensive ($1,400 per year for the average enthusiastic consumer), time-consuming (45 minutes per morning), and, in many cases, ineffective. A "revolution" that simplified the routine to four nights and four products was, in the cultural moment, exactly what the market wanted.

The "skin cycling" concept was also, in the cultural moment, exactly what TikTok wanted. A simple, repeatable, hashtag-able skincare routine was, by TikTok's algorithm, a perfect content engine. Each product becomes a recommendation. Each night becomes a transition. Each cycle becomes a return loop. The result was, by every measure, a win for Bowe, a win for TikTok, and a win for the brands that partnered with the hashtag.

The losers, by my standard, were the consumers. The "skin cycling" rotation was already in dermatology textbooks. The branded products were already overpriced. The four-night rotation is, in 2026, the same four-night rotation it was in 2019 — and the same one that was recommended, by dermatologists, in 1996. The marketing got better. The science did not.

The honest summary

Skin cycling is, in the end, three things: an exfoliant, a retinoid, and a moisturizer. Everything else is, by my dermatologist's standard, "an excuse." The $240 routine I use does, in fact, cycle the skin. It cycled the skin before TikTok had a name for it.

What works for me: a cleanser that does not strip, a chemical exfoliant used once a week, a retinoid used once a week, and a moisturizer used every other night. The rotation takes, by my standard, four minutes a night. The savings over the branded version is, every year, approximately $1,000.

What does not work for me, and may not work for you: the idea that a hashtag is a skincare routine. The hashtag drove, in 2023, an estimated $89M in product sales. The hashtag also drove, in that same year, an estimated 4.2 billion minutes of TikTok viewing. The hashtag did not, by my standard, generate new science. The dermatology textbook the hashtag was summarizing had been around for thirty years.

Seven years in, my skin is, by every measurement that matters, better than it was when I started. I have spent, in those seven years, approximately $4,000. I could have spent approximately $11,000 and had the same skin. The hashtag was, in 2023, the most popular skincare trend of the decade. The hashtag was also, by every dermatologist I have asked, a marketing term for a routine I already had. The math is, by any honest accounting, embarrassing. The math is also, in the end, the only thing that matters.