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Independent·Affiliate-disclosed·Spec-verified·Updated August 11, 2026
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Head-to-head buyer guide

Leap Years Cellular Health System vs Zesty Paws Healthy Aging NAD+ Precursor

Specs, prices, editor verdict, and who should buy which - compared side-by-side.

By Ryan · Founder
Updated Jun 26, 2026
Quick verdict

Leap Years Cellular Health System (premium, $31–$117/mo) vs Zesty Paws Healthy Aging NAD+ Precursor (mid, $59.97) - different tools for different jobs (see the per-product details below).

Compared on 0 shared specs · same category (pets).

Leap Years Cellular Health System bottle with beef-flavored soft chews for dogs
Leap Years

Cellular Health System

Leap Years is the rare dog longevity supplement with an actual published trial behind it, not just NAD buzzwords. It pairs a daily NAD booster with a twice-monthly senolytic chew, and it is honest about what it is: cellular-health support, not a promise of extra years.

PRICE
$31–$117/mo
View at Leap Years
Zesty Paws Healthy Aging NAD+ Precursor capsules box for dogs
Zesty Paws

Healthy Aging NAD+ Precursor

This is the rare pet supplement that borrows directly from the human longevity playbook. The active ingredient is Niagen, the branded nicotinamide riboside found in supplements people take for cellular aging, now dosed for dogs.

PRICE
$59.97
The verdict

These are close picks. Both score in the same range. The right call depends on buyer profile - read the per-buyer recommendations below.

Who should buy which

Pick the Leap Years Cellular Health System if

Owners of adult or senior dogs who want the most research-backed pet-longevity supplement available and are comfortable with a premium monthly subscription.

Skip if

You have a puppy, you want proven lifespan extension rather than early-stage cellular-health support, or a $30 to $117 monthly cost is more than the experiment is worth to you.

Pick the Zesty Paws Healthy Aging NAD+ Precursor if

Owners of senior or aging dogs who already believe in NAD+ support for themselves and want the most direct, single-active way to extend that thesis to their dog.

Skip if

You want proven, vet-backed outcomes today, or you would rather spend on a broad senior multivitamin that covers joints, gut, and heart in one chew.

Go deeper

FULL REVIEW
Read the Leap Years Cellular Health System review →
FULL REVIEW
Read the Zesty Paws Healthy Aging NAD+ Precursor review →

Frequently asked

Which is better, the Leap Years Cellular Health System or the Zesty Paws Healthy Aging NAD+ Precursor?

They are closely matched on our scoring, so the right pick comes down to your priorities. The verdict and spec table above compare them on price, features, and who each one suits.

How much do they cost?

Leap Years Cellular Health System: $31 to $117. Zesty Paws Healthy Aging NAD+ Precursor: $59.97. Prices are verified against the manufacturer; check the live links for current pricing.

Who should buy which one?

Leap Years Cellular Health System: Owners of adult or senior dogs who want the most research-backed pet-longevity supplement available and are comfortable with a premium monthly subscription. Zesty Paws Healthy Aging NAD+ Precursor: Owners of senior or aging dogs who already believe in NAD+ support for themselves and want the most direct, single-active way to extend that thesis to their dog.

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