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Health & Longevity
6 Reasons Your Dog Got Old Faster Than He Should Have
A daily chicken-flavored chew that refills NAD+, the fuel your dog's cells run on, so he moves, plays and greets you like he used to.
If your dog takes the stairs one at a time now, needs a second try to get on the couch, sleeps through you coming home, or is going gray faster than you expected, please read this before you write it off as old age.
Did You Know Your Dog's Cells Start Losing Fuel Years Before He Looks Old?
The stiff mornings. The extra beat before he stands. Shorter walks neither of you decided on. The gray arriving early. The nap that used to be an hour.
Most owners read those as age. They are closer to a fuel problem.
Every cell in your dog's body runs on a molecule called NAD+. It powers movement, repair and recovery.
It also falls steadily with age. That has been measured directly in tissue across the full human lifespan.1
Less NAD+ means less fuel for the repair work that used to happen overnight while he slept.
And dogs run that decline about seven times faster than we do. The year of change you noticed is closer to seven years inside him.
Figure 1
NAD+ level against dog age
1It Works on the Fuel, Not the Symptoms
Joint chews work on joints. Fish oil works on coat. Vitality NAD+ works one step upstream, on the cellular energy and repair systems sitting behind all of them.
That is why one chew covers this much ground.
- Cellular Energy Production
- NAD+ Support
- Joint Comfort & Mobility
- Cartilage & Connective Tissue
- Senescent Cell Clearance
- Antioxidant Defense
- Cognitive Sharpness
- Stamina & Recovery
- Coat & Skin Condition
- DNA Repair Support
- Healthy Inflammatory Response
- Longevity Gene Activation
2It Is the Only Dog Chew Built on the Pairing Tested in Senior Dogs
In 2024, NC State ran a randomized controlled trial in 70 senior dogs. They gave them an NAD+ precursor paired with a senolytic. Owner-rated cognitive scores improved significantly against control.2
That pairing is the whole design of this chew. A precursor refills the fuel. A senolytic clears the worn-out cells that waste it.
Almost every other dog supplement on the shelf is a joint formula. The handful of longevity products run a single precursor and stop there.
None of them run both.
Drag to compare. Replace both frames with the submitted owner photos.
Drag to compare. Replace both frames with the submitted owner photos.
3Seven Actives, Every Dose Printed on the Label
No proprietary blend. No “complex.” Here is the label, per two chews.
Two of those pair on purpose. Sirtuins burn NAD+. NR and niacinamide supply it. Run resveratrol alone and you activate enzymes with nothing to run on.
Vet-formulated. No artificial colors, hormones or antibiotics. Made in an FDA-registered, GMP-certified facility.
- Vet Formulated
- FDA-Registered Facility
- GMP Certified
- Made in USA
4What to Expect, and When
Most owners notice the first change in the second month.
This is not a painkiller and it will not act like one. It refills something that drained over years.
The most common reason it fails is skipped days. Give it sixty days before you judge it, which is exactly how long your guarantee runs.
Days 1 to 14
Levels rise before anything shows.
Nothing visible yet. In the human trial, NAD+ was measurably elevated inside two weeks and stayed up for the full eight.3
Days 15 to 45
The small things come back first.
Owners report the rise from the floor before the walk. In a human RCT, quercetin significantly reduced early-morning stiffness and after-activity pain over eight weeks.6
Day 46 onward
Recognition.
This is where owners use the word “himself.” If you have not seen it by day 60, we do not want your money.
5It Also Works on the Nights
Most owners come to us about the back legs. The thing they mention second is harder to say out loud.
The 3am pacing. Standing at the hinge side of the door. Staring at a wall. Sleeping through you coming home.
A 2025 canine study found dietary resveratrol raised serotonin and BDNF in dogs, improved antioxidant capacity, and normalized the stress axis that governs their sleep cycle.7 A 2023 canine trial found a quercetin blend lowered cortisol.8
The NC State trial measured cognition specifically, and that is what moved.2
Better nights for him usually means better nights for you.
6Sixty Days on Us, or Your Money Back
Give it the full sixty days. If he is not moving better, sleeping better, or acting more like himself, email us and we refund you. No return shipping and no forms.
You keep the jar either way.
⭐ 4.89 from 3,329+ dog parents
“Bailey is eleven and I’d stopped expecting anything. Week six he beat me up the stairs. I actually stood there.”
“I’ve been through three of these. This is the only one where I could tell you what’s in it and how much. Nine weeks in and he’s tracking me around the house again.”
“He stopped the night pacing around week five. First full night’s sleep in a year, for both of us.”
🌿 LAUNCH PRICING
Puppy Harbor Vitality NAD+ Daily Longevity Chew
- Seven actives, every dose printed on the label
- The only chew built on the pairing tested at NC State
- Chicken-flavored, dosed by weight, one-month jar
$39.99 plus $4.50 shipping
- 60-day money-back guarantee
- Cancel nothing, this is a one-time purchase
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⭐ 4.89 | 3,329+ Reviews