Frequently asked questions

Every ingredient has been reviewed for feline safety. We exclude all known toxic substances — alpha-lipoic acid (lethal to cats at 30mg/kg), xylitol, essential oils, and preformed vitamin A. We use forms specifically chosen for cat physiology.

The powder uses a meat-based palatant system optimized for feline acceptance. Tear one sachet into wet food — most cats eat it without noticing.

Coat quality, energy, and appetite improvements are commonly reported within 4–8 weeks. The deeper cellular benefits build over months of consistent daily use.

Yes. While benefits are most pronounced for cats 7+, taurine, omega-3s, and antioxidants support cellular health at any age.

Each packet is organized into daily single-serve sachets. Tear one sachet, mix it into wet food, and repeat once daily.

Whisker9 is the only cat supplement built on the Cupp lifetime feeding trial — a 9-year, 90-cat controlled study showing 40% lower mortality (p = 0.0089). We publish every ingredient and every dose.

Nicotinamide riboside is a NAD+ precursor backed by 500+ published studies. NAD+ declines with aging and is essential for DNA repair and cellular energy. Niagen® is the clinically validated form from ChromaDex.

Whisker9 is designed to be compatible with standard veterinary care. If your cat takes calcium channel blockers, immunosuppressives, or nitroglycerin, consult your vet first.

Whisker9 now defaults to a 90-day subscription so the starter offer, guarantee, and biology stay aligned. A 30-day option remains available for households that want a lighter first order.

The 90-day subscription carries the 90-day money-back guarantee. 30-day options carry the 30-day money-back guarantee.

Subscription billing follows the cadence shown directly in the option you select at checkout. The default 90-day subscription renews every 12 weeks.

No. The Cupp study we reference was conducted by Nestlé Purina between 2001–2010 as a lifetime feeding study with cats receiving standard veterinary care — it was not a harmful intervention study.