For twenty years, the longevity literature has been converging on the same conclusion: sleep, nightly and for decades, is the single highest-leverage thing most people can do for how they age. The supplement aisle has been pointing somewhere else. ARC exists to close that gap. This first letter is about how the brand started, and what it is and isn't willing to claim about itself.
I am someone whose sleep does not come easily, and never has. I have known that fact about myself since I was small. I have spent most of my conscious life — through every common and most uncommon attempt at fixing it — looking for a way to live well with a system that, for whatever reason, did not arrive with its defaults set the way other people's did. Reading the longevity literature in my early twenties was the first time I encountered a framing that did not promise to fix me but did promise that the work was worth doing, every night, for the rest of my life. I built ARC because I needed it. I am the customer. The rest of this letter is what I learned along the way.
Across every author worth reading — Walker, Attia, Huberman, the centenarian researchers, the cardiologists — the conclusion is the same. Almost every system you care about for the second half of your life touches the eight hours you spend horizontal.
The supplement aisle, when you actually go look at it, is not built on that conclusion. It is built on the next-thirty-days horizon that customer-acquisition math runs on. So I went looking for a way to take the literature seriously in my own life, and what I found in the aisle was a disaster.
There is no polite way to describe the state of the sleep-supplement category in 2026. I will try anyway.
Most products on the shelf are built around three or four ingredients, listed prominently on the front of the box, present in the bottle at doses the underlying research does not support. The label says magnesium. The capsule contains fifty milligrams of magnesium oxide, the form your body absorbs least well, at one-eighth the dose used in any peer-reviewed sleep study. The label says ashwagandha. The capsule contains an unspecified amount of an unspecified extract, inside a "proprietary blend" the brand is allowed to hide behind because the regulations let them. The label says made with clinical-grade ingredients. That phrase means nothing.
The industry runs on a quiet trick. Take an ingredient that does, at the right dose and the right form, do something useful. Put a small amount of a cheaper form of it in a capsule. Call out the ingredient by name on the front of the box. Let the customer assume the rest. This is called "fairy dusting" in the trade, and it is so pervasive that the rare brand which actually delivers a clinical dose has to spend its first ten paragraphs explaining the difference.
I am writing those ten paragraphs now. I would rather not have to.
What I wanted, when I started looking, was simple. One product I could take every night for thirty years, that contained the ingredients with the most research support, at the doses used in that research, in the forms the body actually absorbs, made by people who would publish their lab tests. I could not find it. So I made it.
That is what ARC Nightly™ is. That is all it is.
We started with the eight ingredients with the strongest evidence base for sleep architecture and overnight recovery.
Magnesium glycinate, four hundred milligrams elemental — the form best absorbed by the body and most studied for sleep onset. L-theanine, two hundred milligrams of Suntheanine, the patented form the L-theanine studies actually use. Apigenin, fifty milligrams — the chamomile-derived flavonoid that crosses the blood-brain barrier. Glycine, three grams — the dose used in the body-temperature-regulation literature. Saffron, twenty-eight milligrams of affron, the standardized extract the sleep-quality trials were run on — an ingredient almost no one puts in a nightly formula. Ashwagandha, three hundred milligrams of KSM-66, the standardized extract with the most cortisol research behind it. Inositol, two grams — the gram-scale dose that quiets a restless, looping mind rather than sedating it. And L-tryptophan, a full gram — the amino acid your body converts into serotonin and, downstream, its own melatonin, so we support the pathway instead of dosing the hormone directly.
And one thing we chose to leave out: melatonin. It was the hardest call and I think the right one. Melatonin shifts when you feel sleepy more than it improves how you actually sleep, and the five-and-ten-milligram products you see at CVS create tolerance and suppress the body's own production. They are a worse version of the molecule, sold louder. A formula meant to be taken for ten thousand nights shouldn't be built on it. So it isn't.
That is the formula. There is no proprietary blend. There is no special engine. There is no patented technology. Every number is on the front of the box. Every batch is tested by an independent accredited lab, and every certificate of analysis is published on the website by batch number, so anyone can check the doses for themselves.
We do not say "clinically dosed" the way the rest of the industry does, where it is a slogan. We mean the doses on the bottle match the doses in the published trials. That is a checkable claim. We invite the check.
A friend who reads early drafts of these letters asked me why we are not just shipping the product yet.
It is a fair question. The formula has been finalized for months. The first ceramic vessels are coming out of the kiln in small batches. The contract manufacturer is ready. We could be sending boxes by the end of next quarter.
We are not, because the slowest brands in this category are the ones I trust to still be honest in five years.
The supplement industry has a particular failure mode. A founder starts with an integrity story — clean doses, no hype, no fairy dusting. The first thousand customers come in because the story is true. The brand grows. A growth marketer joins. The growth marketer's job is to make the customer-acquisition-cost math work, and the math does not work without performance-marketing-friendly claims. The claims sharpen. The doses get re-engineered to hit a lower cost of goods. The founder, who was perfectly honest at the beginning, does not notice this happening, because every individual decision is small and reasonable. Five years in, the brand is indistinguishable from the brands the founder was trying to be the opposite of.
I have watched it happen to people I admire. I will not watch it happen to me.
So we are doing something a little odd. We are shipping first to a small group — one thousand people, no more, in 2027 — and locking their price for life. We are calling them the founder's group, because that is what they are. They are the room that will hold us accountable. They are paying the founder's price because they are, in a real sense, helping build the founder's brand. When the formula or the ritual or the testing protocol needs a refinement, they will hear about it before anyone else, and they will tell us what is and is not working. When we have to make trade-offs later between margin and integrity, the founder's group is the constituency we cannot afford to disappoint.
It is the inverse of a launch. A launch is the moment a brand goes from no customers to as many customers as it can find as fast as it can find them. We are going from no customers to one thousand customers, slowly and on purpose, before we open the door any wider.
A note on the ritual, before I close.
There is a thought-experiment I keep coming back to. Imagine a magic pill that does everything ARC Nightly does. Same molecules, same doses, same overnight effects. The only difference is that the magic pill is invisible, weightless, and dissolves in your mouth before you notice it.
Most supplement brands would consider the magic pill the ideal product. The whole experience design tries to approximate it. Make the pill smaller, the bottle plainer, the routine more invisible. Reduce friction. Reduce thought. Get out of the way.
We think the opposite. We think the friction is the point.
A nightly supplement you do not notice yourself taking is a nightly supplement you will eventually forget to take. A ritual you do not notice yourself performing is not a ritual; it is a chore. The small piece of time you spend at the end of the day — opening the vessel, tearing the stick, pouring it into water, watching it dissolve, drinking it slowly — is, in our view, doing as much work as the molecules. It marks a transition. It tells your nervous system that the day is over. It is the same reason humans light candles before dinner, and wear different clothes to sleep in than the ones they walked the city in. The frame around the action is the action.
The ceramic vessel that arrives with your first shipment is not a marketing object. It is a behavioral anchor. We made it heavy on purpose, so it sits on the bedside table and does not move. We made it hand-numbered on purpose, so you remember which one is yours. We made it ceramic and not plastic on purpose, because we are asking you to keep something for thirty years, and plastic does not deserve thirty years of your attention.
I will close where this letter started, with the convention I am refusing to play.
I am not going to claim ARC will change your trajectory. Sleep is a probabilistic intervention; the science we have is about populations, not individuals. What it says is that, on average, across enough people and across enough nights, getting the basics of sleep right shifts the curve of how you age — by a meaningful, measurable amount, but not by a miracle. That is the entire game, and we are not going to oversell it.
That is the honest pitch. It is the only one I am willing to make.
What I can promise is this. The doses on the bottle will match the doses in the research, every batch, forever. The certificates of analysis will be published, every batch, forever. We will never run a countdown timer, never inflate a discount, never bury the cancel button, and never grow the brand at the cost of the formula. The first thousand people who reserve a spot will have their price locked for life, and when the brand reaches a million customers — if it ever does — those first thousand will still be paying what they paid in 2027.
And you will hear from us, quietly, four times a year, like this. Once a quarter. A few thousand words, considered. No promotions disguised as content. No urgency. No ask, except, occasionally, that you keep the ritual.
That is the long arc. It begins, every evening, with three small motions.
Sleep deeply tonight. We are building this slowly.
— Dan
P.S. If you have not yet, the science page lays out every ingredient, every dose, and every paper the formula was built on. The COA library publishes every batch we have ever made. The next letter ships in December, and will be about the strange architecture of the first four hours of sleep — which is where the recovery actually happens.