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.
Pet longevity is the new frontier of the supplement world, and most of it is vibes. Leap Years is the version that brought receipts. The product is a two-part soft chew system: brown LY-D2 chews deliver a daily NAD booster derived from nicotinamide (a B vitamin), and golden LY-D6 chews add a plant-derived senolytic antioxidant on two consecutive days each month. The thesis is the same one driving human longevity research: support NAD+ levels and help the body clear senescent (worn-out) cells.
What sets it apart from the shelf is evidence. Leap Years ran a double-blind, placebo-controlled trial at North Carolina State University's College of Veterinary Medicine, published in May 2024. That is a higher bar than almost anything in the pet-supplement aisle clears. It is veterinarian-formulated, patent-pending, and made in a US GMP facility.
Honesty matters here, so be clear-eyed: longevity claims in pets are early-stage and not proven. One trial is a strong start, not settled science, and no supplement makes a dog live longer on demand. Leap Years itself frames the product around cognition, vitality, and activity in adult dogs rather than lifespan guarantees, and we like that restraint.
It is priced like a serious product, scaling from about $31/mo for small dogs to $117/mo for the largest breeds. For owners of aging dogs who want the most research-backed option in a young category, this is the one to start with. Just go in treating it as a well-studied bet on healthy aging, not a miracle.
Owners of adult or senior dogs who want the most research-backed pet-longevity supplement available and are comfortable with a premium monthly subscription.
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.
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Leap Years Cellular Health System - buyer FAQ
What is actually in Leap Years and how does it work?
It is a two-part beef-flavored soft chew system. The daily brown chew (LY-D2) provides an NAD booster derived from nicotinamide, a B vitamin, to support NAD+ levels tied to cellular energy. On two consecutive days each month you give the golden chew (LY-D6), which adds a plant-derived senolytic antioxidant intended to support the body's natural clearance of senescent cells. It is formulated for adult dogs, not puppies, and dosing scales by weight.
Is there real science behind it, or is this just NAD marketing?
Leap Years is one of the few pet-longevity products with a published study: a double-blind, placebo-controlled trial conducted at North Carolina State University's College of Veterinary Medicine, published in May 2024. It is veterinarian-formulated and patent-pending. That said, pet-longevity research is early-stage and a single trial is not proof that any supplement extends lifespan. Treat it as a research-backed bet on healthy aging, and talk to your own vet before starting.
How much does Leap Years cost and can I buy it without a subscription?
Pricing scales with your dog's weight, from roughly $31 per month for small dogs up to about $117 per month for X-Large breeds, with StyleCaster citing a starting price of $63. It is sold primarily as a monthly subscription, but the brand buy page has a toggle to order once instead. Confirm the exact price for your dog's size at checkout.