What is the best NAD+ supplement for dogs?

For most owners, Leap Years. It's a soft chew that pairs an NAD+ booster with a senolytic, and it's the only brand in the category with a published, placebo-controlled trial behind it, run with NC State's veterinary college. It costs about $59.95 for a jar that covers one to two months depending on your dog's size.

Do NAD+ supplements actually work for dogs?

The science is promising and still early for most brands. NAD+ falls as dogs age, and boosting it is a plausible way to support cellular energy. Leap Years is the one entrant with real proof: a 2024 randomized, placebo-controlled trial at NC State reported better owner-rated cognition than placebo. Most rivals, LongTails included, rely on studied ingredients rather than their own finished-formula trial, so treat those results as support, not a cure.

What is the difference between NAD+ and NMN or NR for dogs?

NAD+ is the coenzyme cells use to make energy, and it declines with age. NMN and nicotinamide riboside (NR) are precursors, building blocks the body converts into NAD+. Leap Years combines an NAD+ booster with a senolytic that clears worn-out cells; LongTails leans on an NR precursor plus collagen for joints.

At what age should a dog start an NAD+ supplement?

Most owners start healthy-aging supplements as a dog enters its senior years, around seven for many breeds and earlier for large ones. The idea is to support cellular energy while a dog is still doing well, rather than waiting for a visible decline. Your vet can help time it to your dog's breed, size, and health history.

Are NAD+ supplements safe for senior dogs?

Generally yes, when dosed for your dog's weight, and both picks here are veterinarian-formulated. They're healthy-aging supplements, not treatments, so check with your veterinarian first, especially if your dog is on medication, pregnant, or managing a diagnosed condition.

2 Best NAD+ Supplements for Dogs of 2026

The hardest part of an aging dog is watching the zoomies fade and the stairs get slower, and NAD+ supplements are the healthy-aging trend owners reach for to slow that down. The catch is telling a genuinely proven blend from a hopeful one.

NAD+ is a coenzyme that powers how cells make energy, and it drops as a dog gets older. Topping it back up is a plausible way to support vitality in a slowing senior, which is why the category has exploded, mostly on hope rather than data.

So we compared the leading NAD+ supplements for dogs of 2026 on what’s actually in them, the real evidence behind each, and the price. One brand has done the one thing the rest of the category hasn’t: run its finished formula through a published trial. That’s Leap Years.

The best NAD+ supplements for dogs of 2026 at a glance

Leap Years: Best overall, the only published dog trial (soft chew, ~$59.95)
LongTails: Best value, powder with added collagen (~$39.95)

1. Leap Years: best overall

Jar of Leap Years dog supplement soft chews for senior dogs

Leap Years is the brand with the receipts. It’s a soft chew that pairs an NAD+ booster with a senolytic, a compound that helps clear worn-out cells, a mechanism most of the category doesn’t target at all.

The proof is the pitch. In a 2024 randomized, placebo-controlled trial run with NC State’s veterinary college, 89% of the full-dose group improved or held steady on owner-rated cognition, versus 60% on placebo. That’s genuine, category-leading evidence for a supplement this specific, and it’s fair to note independent reviewers flag that the scores are owner-reported and every group, placebo included, showed some improvement, a sign that trial participation itself moves the numbers a little.

It’s a daily soft chew, easy to give as a treat, and it’s veterinarian-formulated with no common animal-protein allergens, so dogs with food sensitivities can usually still take it. A single jar runs about $59.95 and covers one to two months depending on your dog’s size (a small dog’s 31-count jar stretches to two months; a large dog needs two jars for one month).

Owners who review it point to the ease of a chew their dog treats like a treat, and steadier energy reported over the trial’s three-month window, the same span the published study measured its results across.

If you want the healthy-aging supplement with an actual clinical trial behind it, start here.

See Leap Years on Amazon →

2. LongTails: best value

Senior golden retriever beside a jar of LongTails NAD+ precursor powder supplement for dogs

LongTails is the cheapest sensible way into the category, and it takes a different format: a powder you scoop onto food. At about $39.95 for roughly 60 days, it’s the value pick here.

The formula leans on nicotinamide riboside (NR), an NAD+ precursor, plus 1,500 mg of collagen for joints and connective tissue. That collagen angle is a real differentiator: if your senior dog’s slowdown is as much stiff hips as low energy, the added joint support is a genuine bonus Leap Years’ chew doesn’t include.

The honest note is that, like most of the field, LongTails relies on studied ingredients rather than its own finished-formula trial, so treat it as support, not proof. A powder also means measuring a scoop and stirring it in, which most dogs accept fine on wet food.

Pick LongTails if you want the lowest monthly cost and a bit of joint support baked in.

How to choose an NAD+ supplement for your dog

Start with the evidence, because this category is mostly unproven. Leap Years is the only brand with a published, placebo-controlled dog trial right now, so if peer-reviewed proof is your bar, that’s the pick. The rest of the category, LongTails included, rests on studied individual ingredients and owner reports, which is promising but early.

Then match the format to the dog you actually have. A chew works fine for a dog that treats it like a treat; a powder or liquid you add to food is the better bet for a picky eater that spits out chews and pills.

Look for a real NAD+ precursor (NMN or NR), a direct NAD+ booster, or a senolytic, ideally with a supporting mechanism like collagen for joints if your dog’s issue is as much mobility as energy. Brands that disclose their doses and cite real trial data earn more trust than ones leaning on marketing language alone.

Finally, mind the practical fine print. Check the guarantee window, dose to your dog’s weight, and give it consistently for a few weeks, ideally the same three months the Leap Years trial measured, before you judge. And loop in your veterinarian first, especially for a dog on medication or managing a condition.

The verdict

Leap Years is the best NAD+ supplement for most dogs in 2026: an NAD+ booster and senolytic in a daily chew, backed by the only published, placebo-controlled trial in the category, run with NC State’s veterinary college. It’s the pick if you want a healthy-aging supplement with real data behind the claim.

LongTails is the value option, with a powder format and a helpful dose of collagen for stiff senior joints, at roughly two-thirds the monthly cost.

For stiff hips and knees, our best joint supplements of 2026 roundup goes deeper. Fresh food helps an aging dog too, which our Nom Nom review covers, and our Dr. Rover Tick Off review handles pest protection for walks. There’s more in the health hub.