The Best NAD+ Supplement for Dogs: 4 Senior-Longevity Picks, Scored

By Barbara Maton, DVM, DACVECC

✓ Medically reviewed by Barbara Maton, DVM, DACVECC — July 23, 2026 For general education — not a substitute for veterinary care.

Senior & longevity · July 23, 2026 · 4 min read

The best NAD+ supplement for dogs pairs a real NAD+ precursor with antioxidant support and independent third-party testing.

Last spring, a client brought me a nine-year-old Lab named Biscuit who had quietly stopped taking the stairs. His bloodwork was clean. His joints checked out. He was just slower to stand, slower to greet, and grayer around the muzzle every month. His owner asked the question I now hear constantly: is there anything that buys him a few more good years?

That question is why the senior-dog aisle is suddenly full of NAD+ supplements. I graded every product on the same rubric, and I say plainly where a competitor wins.

What does NAD+ actually do for an aging dog?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme every cell runs on. According to the NIH, more than 400 enzymes depend on NAD to catalyze basic reactions, more than for any other vitamin-derived coenzyme. Those levels drift down with age. The logic of these products is straightforward: you cannot feed a dog NAD+ directly, so you give a precursor the body converts into it. The precursor most of these chews use is nicotinamide riboside (NR), a form of vitamin B3.

Does it hold up? In people and mice, at the level of biochemistry, yes. A 2016 Nature Communications study showed oral NR is bioavailable and raises blood NAD+, and a 2018 trial found chronic NR was well tolerated and elevated NAD+ in healthy middle-aged and older adults. Now the caveat I give every owner. Those are human and rodent data. Canine outcome trials are thin, and the one dedicated dog study, the Leap Years work run out of NC State, reported cognitive gains but is still a preprint awaiting peer review. So I frame NR the way the evidence allows: supportive of normal cellular energy metabolism, not curative. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

How did I score these NAD+ chews?

Same rubric for every product. I weighted five things:

• Precursor and dose: is it a real precursor like NR, and how much per serving?
• Formulation: does anything support the NAD+ story, such as antioxidant co-factors?
• Testing and standards: third-party purity and potency testing, plus NASC membership.
• Format and palatability: will the dog actually take it every day?
• Claim honesty: does the label stay in structure and function language?

Nutraceuticals are an adjunct in senior care, not first-line medicine. Give any pick a fair trial, monitor the response, and stop if nothing changes.

Which NAD+ supplement is best for most dogs?

For most senior dogs, my top pick is Boops Pets Longevity & Healthy Aging. Each two-chew serving delivers 120 mg of nicotinamide riboside alongside quercetin (100 mg) and resveratrol (40 mg), antioxidants that support cellular health and vitality, plus vitamin C (100 mg) and niacinamide (50 mg). It was formulated by Dr. Sarah Mitchell, a board-certified veterinary nutritionist.

Three things push it to the top of the list. It is an NASC Quality Seal member, which means its facilities passed an independent audit. It is third-party tested by Eurofins for purity and potency. And it is an air-dried, human-grade soft chew with no corn, soy, or artificial fillers, which matters more than owners expect, because a supplement only works if the dog eats it. Owner experience tracks with that: in an independent survey (March 2025, n=193), 97.8% of owners reported a visible improvement after the first jar. That is owner-reported experience, not a clinical endpoint, and I present it as exactly that.

The honest con: at 120 mg, its NR dose sits mid-pack, below LongTails’ 200 mg, and a rival brand publicly needles Boops for not posting a public certificate of analysis. The third-party testing is real, but that transparency critique is fair. The FDA disclaimer above applies here too.

Where do the competitors win?

I did not hand Boops every category. If a single high NR number is your priority, LongTails NAD+ Precursor wins it outright: 200 mg of NR per scoop with a fully disclosed label and added collagen and bone broth, though it is a powder rather than a chew. If clinical pedigree matters most, Leap Years is the one to watch, because it pairs an NAD+ precursor with a senolytic and is the only brand here with a dedicated canine trial, from the Sinclair-founded Animal Biosciences; just remember that trial is still a preprint. And if you want the widest availability, Zesty Paws Healthy Aging uses ChromaDex’s branded Niagen (60 mg of NR per capsule) and sits on nearly every retail shelf, with the trade-offs being a capsule format and a lower per-serving dose. Forever Dog Lab and NAD for Animals compete in the same space; I left them off the scored list only because I could not verify their current formulas to the same standard.

So how should you actually start?

Pick one product and give it a boring, honest trial. The labeled dose, every day, for 8 to 12 weeks, with a one-line note on your dog’s energy and stairs at week zero and again at week twelve. Talk to your own veterinarian first if your dog takes medication or has kidney or liver disease. NAD+ support is supportive care for healthy aging, not a replacement for a diagnosis. If Biscuit were my patient, I would start with the Boops chew for the testing and the antioxidant co-factors, and I would not hesitate to move to LongTails if I wanted the higher NR number.