Skin Aging Starts in Your Cells, and Urolithin A Gets There
By the time a wrinkle is visible, the damage has already been accumulating for years. As we age, our cells accumulate damage, collagen production slows, and the skin barrier gets thinner.
What I find interesting is that almost everything I have ever put on my face was designed to work on the part you can see. That gap between where skin aging happens and where most products act is what I want to spend this post on. Urolithin A, and the patented form of it called Mitopure, is one of the few ingredients with separate trials for skin and whole-body health.
What is actually happening in aging skin
Skin ages the way every other tissue ages. One of the major contributors is mitochondrial decline.
Mitochondrial dysfunction is one of the twelve hallmarks of aging; in the skin, our mitochondria sustain the collagen production that keeps the skin renewing, and the lipid production that holds your barrier together.
A 2026 review linked mitochondrial decline to skin thinning, slower skin turnover, collagen fragmentation, and a weaker barrier. Sun exposure accelerates all of it by pushing fibroblasts, melanocytes, and epidermal stem cells into senescence.
Now look at what most of us are putting on our faces. Exfoliants speed up shedding. Humectants hold water. Peptides signal. Retinoids push turnover. All of it is useful, and I am not telling you to throw any of it out. But none of it addresses why the cell slowed down in the first place, which is the question I got interested in.
What Urolithin A is, and why most people cannot make enough of it
Urolithin A is a postbiotic. You do not eat it. Your gut bacteria make it from ellagitannins, compounds in pomegranates, walnuts, and berries.
Urolithin A activates mitophagy, the quality control system cells use to identify damaged mitochondria and clear them out so new ones can take their place. Mitophagy slows with age. Damaged mitochondria accumulate. Energy output falls. That is the sequence, and it runs in skin cells the same way it runs everywhere else.
Here is the part that surprises people. Most of us barely make any Urolithin A. In a randomized trial of 100 healthy adults, only 12% had detectable Urolithin A in plasma at baseline, and roughly 40% converted the precursors after drinking pomegranate juice. Whether you are a producer tracks with the diversity of your gut microbiome, which means eating more pomegranate is not a workaround.
What topical Mitopure does for skin
Applied to the skin at 1%, Urolithin A visibly reduces the appearance of wrinkle depth and volume and supports collagen assembly.
Three randomized trials in roughly 178 participants have tested it. In the first, a split-face design in 48 women aged 50 to 75, 1% Urolithin A significantly upregulated collagen synthesis pathways in skin biopsies and reduced facial wrinkle depth.† Skin biopsies are what make that interesting. It is not a study about how people said their face felt. Something measurable changed in the tissue.
In a separate photodamage trial in 22 adults, the 1% concentration produced roughly a 14% reduction in UV-induced redness, while the placebo and a lower 0.5% dose did nothing at all.
The finished product built around that 1% concentration is the Firming Serum. In an 8-week randomized controlled trial in 36 women aged 40 to 65, it was clinically proven to improve skin hydration by 23% and to reduce the appearance of fine lines and wrinkles.‡
So why take it internally as well
Because the oral trials measured something else entirely, and I think that distinction matters more than most bundle marketing admits.
The gummies are not a skin product. What the oral form has been tested for is muscle and cellular energy. In a Nature Metabolism publication, four weeks of Urolithin A shifted muscle mitochondrial gene expression in sedentary older adults, with safety as the primary outcome. In the ATLAS trial, four months at 500 mg produced roughly a 12% improvement in muscle strength.*
I use the serum for my face and take the gummies for the rest of me.
Where I get mine
I use Timeline. Their Mitopure is the patented, purified form of Urolithin A, and it is the form used in the human trials I have linked throughout this post, which is not true of every Urolithin A on the shelf.
The Firming Serum delivers 1% Mitopure topically, clinically proven to improve skin hydration by 23% and to reduce the appearance of fine lines and wrinkles, for visibly smoother, more youthful-looking skin.‡
The Mitopure Gummies are two sugar-free gummies a day at 500 mg, clinically proven to increase muscle strength* and improve cellular energy. The Inside Out Bundle pairs them if you want both.
Ready to support your skin and cellular health? Explore Mitopure and save 20% with my code NAT20.
* Our clinical study showed that sedentary, middle-aged adults with an average BMI of 29.52 increased hamstring muscle strength.
† Based on an 8-week randomized clinical trial of 48 healthy women aged 50 to 75 years.
‡ Based on an 8-week randomized controlled clinical trial of 36 healthy women aged 40 to 65 years. Morning and evening product application.