Canine Longevity · Large Breeds Over 7
Your dog isn't getting old. His cells are running out of fuel.
The shorter walks. The pause at the bottom of the stairs. The longer naps. Vets can now point to a measurable reason behind all three — and to the molecule that longevity researchers use to address it.
There is a specific moment most owners of a big dog can name. You reach the corner where he always used to pull ahead, and he doesn't. He waits. He looks at you. And you tell yourself what everyone tells themselves: he's just getting older.
That explanation is comfortable, and it's also incomplete. "Old" is not a mechanism. It's a label we put on a set of changes we haven't looked at closely — and in large breeds, those changes start showing up years before the grey muzzle does.
Underneath the slower walk is something specific and, increasingly, something measurable: a shortage of the molecule every cell in his body uses to make energy and run repairs. It's called NAD⁺, and it declines steadily with age in mammals. Human longevity research has spent the last decade on it. Canine research is now catching up.
The reframe that matters
He isn't slowing down because he's old. He's slowing down because his cells have less fuel to work with — and unlike age, fuel is something you can do something about.
The Cellular Energy Crisis™
Every cell runs a repair budget. His has been quietly cut.
NAD⁺ is the currency mitochondria use to turn food into usable energy — and the same currency cells spend on repair. Levels fall with age across mammals. Less currency means less energy for movement and less left over for maintenance.
Illustrative representation of the age-related NAD⁺ decline described in mammalian research. Not a measurement of an individual dog.
The Repair Gap™
Damage accumulates at a steady rate his whole life. Repair capacity doesn't — it falls. The widening space between the two is where everything owners call "aging" actually lives: the stiffness after a nap, the cloudier eyes, the walk that gets shorter every season.
Where NMN comes in
NMN is the direct precursor his body converts into NAD⁺. Supply the precursor daily and you support the pathway that funds cellular energy production and repair. It's the same molecule millions of people now take themselves — the difference is dose, form and formulation for a dog's body.
Human-grade, dog-dosed
Cellular Fuel™ — three NAD⁺ precursors in a soft chew, dosed by body weight.
Most pet supplements that mention NMN include a token amount and hope you don't check. We publish every amount on the pack, because the amounts are the entire point.
300mg of NMN per serving, plus 100mg of nicotinamide riboside and 20mg of niacinamide — three separate routes into the same NAD⁺ pathway. Alongside them, the cofactors mitochondria need to actually spend it: CoQ10, PQQ, resveratrol and quercetin. Seventeen actives, every milligram disclosed.
- NMN
- 300mg per serving
- Also
- NR 100mg · Niacinamide 20mg
- Cofactors
- CoQ10 · PQQ · Resveratrol · Quercetin
- Actives
- 17, all disclosed in mg
- Serving
- 2 chews (5g)
- Daily dose
- 1–4 chews by body weight
- Tub
- 120 chews · 300g
- Form
- Cold-extruded soft chew
- Flavours
- Chicken · Beef · Duck · Salmon
Sized to your dog · Cancel anytime · 90-day guarantee
A practice, not a pill
What the first 90 days actually look like
Cellular repair compounds. Nothing about this works in a week, and any brand that tells you otherwise is selling you something else. Here's an honest timeline.
Nothing visible yet — and that's expected
The chew goes down with breakfast. Behind the scenes his cells are being supplied with the NMN they convert to NAD⁺. Anyone promising a visible change this week is guessing.
The small things owners report first
Most owners describe it the same way: he gets up faster. Less of a production getting off the floor, a bit more interest at the door. Easy to miss unless you're looking.
The walk gets its distance back
This is the window owners write to us about. The route that had quietly shortened over two years starts stretching out again — not puppy energy, just a dog who wants to keep going.
It becomes the new normal
By the end of a full cycle you stop noticing improvements and start noticing the absence of decline. That's the point of the whole exercise — this is maintenance, not a fix.
Individual results vary. Cellular Fuel is a nutritional supplement intended to support healthy aging — it is not a treatment for any medical condition. Talk to your veterinarian about your dog's specific situation.
From owners
What people notice first
PLACEHOLDER — replace with a real, verifiable review. Keep the language an owner would actually use, and never let a testimonial promise an outcome the ad copy cannot.
PLACEHOLDER — replace with a real, verifiable review. Reviews that name the specific thing the owner noticed (the walk, the stairs, the mornings) outperform generic praise.
Quarterly plan · Free shipping · Cancel anytime
Less than a bag of premium treats. Every single day.
Works out to $38.33/month, billed quarterly as $114.99.
300mg NMN per serving — with every one of the seventeen actives listed in milligrams
Three NAD⁺ precursors, not one — NMN, nicotinamide riboside and niacinamide
Dosed by body weight — 1 chew a day under 10kg, up to 4 for a giant breed
Cold-extruded — NMN is heat-sensitive, so the chew is built to survive the delivery van
90-day money-back guarantee — a full cycle, refunded even if the tub is empty
Sized to your dog · Cancel anytime · 90-day guarantee
DAY
The 90-Day Good Years Guarantee
Give it one full cycle. If you don't see a difference on the walk, email us and we refund the whole thing — chews already eaten, no return required, no argument.
Straight answers
The questions we get before anyone buys
Is NMN actually safe for dogs?
NMN has an established safety profile in mammalian research and is widely used in human supplementation. The serving here is dosed to body weight rather than given as one flat amount to every dog. As with any supplement, talk to your vet first — particularly if your dog takes medication or has a diagnosed condition.
How is this different from the joint supplement I already give him?
A joint supplement supplies raw material to one tissue. Cellular Fuel supports the energy and repair pathway every tissue depends on, including joints. They aren't competitors — plenty of customers run both. If you only want one, start with the pathway upstream.
Why is this subscription-only?
Because cellular repair compounds daily and stops compounding when the chews run out. For a large dog a single tub is roughly a month, which buys a good month and no lasting change — and we'd rather not sell that. Deliveries are sized to your dog so a cycle actually lasts a cycle, and you can skip, delay or cancel from your account in a click.
My dog is 11. Is it too late?
No. The decline described here is progressive rather than a cliff, and supporting the pathway is worthwhile at any age. What changes with age is expectation: an 11-year-old is unlikely to move like a five-year-old, but owners of older dogs consistently report the same first signal — easier mornings.
What if he won't eat it?
It's a soft chew rather than a capsule, and it comes in chicken, beef, duck and salmon, so a fussy dog usually has an option. Worth knowing if your dog reacts to chicken: the standard chew uses a chicken base, so pick another flavour and check that panel first. If he refuses all of them, the 90-Day Good Years Guarantee covers you — we refund in full without a return.
What exactly will I be charged?
One charge every 90 days, shipping included, for a delivery sized to your dog's weight. No trial that converts to something bigger, no fee to cancel, no phone call required. You'll get an email before every renewal.
Sized to your dog · Cancel anytime · 90-day guarantee