CELLSHE Learn
Free, evidence-informed writing on cellular health, healthy aging, and the three compounds most talked about in longevity research — NMN, NAD+, and resveratrol. Written for women roughly 40 to 65 who read the studies and ask real questions.
Everything here is free to read — no account, no paywall.
Start here
Most people arrive with one of three questions. Pick the one that sounds like yours.
The Cellular Age Check estimates your biological age from your daily habits, with an optional PhenoAge from nine routine blood markers if you have recent labs. Free, private, processed entirely in your browser — nothing is stored or sent. Educational, not a medical test.
Aging Well After 40 is our full field guide: the twelve hallmarks of aging in plain English, five free at-home tests you can do today, midlife protein targets, the sleep reset, and a daily routine that fits a real week. Free to read in full, with a printable version to keep by the kitchen or take to your next check-up.
Read the field guide →The Science page covers what NMN, NAD+ and resveratrol are, what the human research supports, and — more usefully — where it stops. Then the Journal goes deeper, one question at a time.
Read the science →Quick answers
Each one links to the longer piece. Where an answer sounds hedged, that is deliberate — it reflects where the evidence actually sits, not where we would like it to sit.
NMN (β-nicotinamide mononucleotide) is a naturally occurring compound found in small amounts in foods like broccoli, avocado and edamame, and produced inside the body. It is a direct precursor to NAD+, meaning cells convert it into NAD+ through what is called the salvage pathway. In human trials, oral NMN consistently raises measured blood NAD+ levels.
The full guide to NMN →NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every living cell. It carries electrons in the reactions that turn food into usable cellular energy, and it is required by enzymes involved in DNA repair and cellular signaling. It is not a vitamin, not a hormone, and not a stimulant.
The full guide to NAD+ →Less clearly than the marketing suggests. Early work in small samples reported age-related declines, and that finding became the industry’s favorite chart. Larger pooled analyses of whole blood have not reproduced a consistent drop with age. What is consistent runs the other way: taking an NAD+ precursor measurably raises blood NAD+. We think capacity is the more honest frame than deficit — and we would rather tell you that than sell you a graph.
Can you measure your NAD+? →Biological age is an estimate of how well your body’s systems are functioning, compared with the number of years you have lived (your chronological age). It is estimated three main ways: from routine blood markers (the PhenoAge method), from DNA methylation patterns (epigenetic clocks), or from functional tests such as grip strength, walking speed and the sit-to-rise test. None of them is a diagnosis.
How to test your biological age →Resveratrol is a polyphenol found in Japanese knotweed and the skin of red grapes. Trans-resveratrol is the studied, more stable form of the same molecule — it is the one worth looking for on a label, along with the percentage standardized. Its antioxidant activity is well documented in laboratory work. The human outcome research is thinner and more mixed than the popular coverage implies.
Trans-resveratrol vs regular →It depends entirely on what you mean by work. There is good human evidence that NAD+ precursors raise blood NAD+. There is much weaker evidence that this changes how you feel day to day. And nothing in a capsule outperforms sleep, protein, strength training and steady blood sugar. That is exactly why we describe our own range as one small, optional part of a routine — never a shortcut, and never a replacement for the foundation.
Start with the foundation →The library
Every article is written and fact-checked by CELLSHE Editorial Team against primary research, and dated so you can see how current it is. This index builds itself — new articles appear automatically.
What the molecules are, how they work, and what the human trials actually found.
Biological age, the hallmarks of aging, and the habits research links to how we age.
Molecule-by-molecule breakdowns: forms, purity, and what to look for on a label.
How to compare products and brands without relying on the label's promises, including category round-ups.
Timing, dosing, and how to build a daily routine you will actually keep.
Side effects, interactions, and the questions worth asking your clinician.
Questions specific to women in midlife — and where the research does not yet separate us out.
Our method
Longevity is a field with more enthusiasm than evidence. These are the six standards we hold this library to — the Learn pages and the CELLSHE Journal — including when they cost us a good headline.
Where we stop
The fastest way to understand an evidence-led brand is to see where it draws the line. These are the limits we hold this library to. If you find something here that falls short of them, write to hello@cellshe.com and we will correct it.
Free tools & guides
Answer 8 quick questions or the full 27. You get an instant cellular-age estimate and a seven-pillar read across sleep, movement, nutrition, stress, metabolic health, sun and connection — calculated privately in your browser, nothing stored. Add your email and it becomes a report to keep: your three biggest levers, a 30-day plan, and an optional PhenoAge from routine bloodwork.
Everything from the field guide in one calm document: the hallmarks of aging in plain English, five free at-home tests, protein targets by bodyweight, the sleep reset, blood-sugar basics, and a one-page daily routine. Free to read in full on the page. Add your email and the complete guide opens as a printable PDF — one to keep by the kitchen, or take to your next appointment.
In context
Everything above is the foundation, and no capsule replaces it. If you decide a supplement belongs in your routine anyway, here is ours — three formulas doing three different jobs.
All three carry transparent doses with no proprietary blends, are third-party tested in ISO/IEC 17025 accredited laboratories with a Certificate of Analysis, and are manufactured in the USA using globally sourced ingredients.
About this library
Yes — everything here is free to read, with no account and no paywall. Two of our deeper resources ask for your email in exchange: the printable field-guide PDF, and the full report at the end of the Cellular Age Check. Both are free, the email is all we ask, and you can unsubscribe whenever you like.
Articles are written and fact-checked by CELLSHE Editorial Team against primary sources — peer-reviewed studies, systematic reviews, and NIH or FDA guidance. Each article carries a byline and a last-reviewed date. Our full editorial standards, including how we handle corrections, are published on our Standard page.
No. The check is free, needs no purchase and no account, and your answers stay in your browser — never stored or sent to a server. Your email only comes in if you want the full report as a PDF; the on-screen result asks for nothing. Unsubscribe whenever you like.
New articles are added regularly, and existing articles are re-checked against current research on a rolling basis. Each article shows its published and last-reviewed dates. When newer evidence changes what we previously wrote, we revise the article and note what changed rather than quietly deleting it.
No. Everything here is general wellness education. It is not medical advice, not a diagnosis, and not a substitute for professional care. Talk with your healthcare provider before starting a supplement or making significant changes to your diet or exercise, particularly if you are pregnant or nursing, take medication, or have a health condition.
Yes, and we would rather you did than paraphrase us inaccurately. Quote what you need with a link back to the original article. For press, research or partnership questions, write to press@cellshe.com
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The content in this library is provided for general education only. It is not medical advice, a diagnosis, or a substitute for professional care, and nothing here is intended to diagnose, treat, cure, or prevent any disease. Associations between habits and how we age come from population research and are not guarantees for any individual.
CELLSHE products are intended for healthy adults. Consult your healthcare provider before starting any new supplement, especially if you are pregnant, nursing, take medications, or have a medical condition. Not for use by individuals under 18 years of age.
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