Questions about MD1

A longevity supplement for dogs is a daily product that supports the body systems that change with age, such as joints, digestion, immune function and cellular energy, rather than targeting a single issue. Matterdays MD1 is one: a daily powder for dogs and cats with 17 ingredients backed by published research. It isn't a medicine and isn't intended to diagnose, treat, cure or prevent disease.

MD1 Daily Longevity Blend is a daily powder for dogs and cats made by Matterdays. It contains 17 ingredients with published research, including bone broth, bovine colostrum, green-lipped mussel, mushrooms, probiotics, taurine and CoQ10, with zero fillers. It was developed with Dr. Jenna Lenarz, DVM, MRCVS, and every batch is tested by Eurofins, an independent lab, with the lab report published.

MD1 can be started from around 16 weeks of age and suits adult and senior dogs. Many owners begin in adulthood, before age-related changes appear, because MD1 is designed for steady daily use. The American Animal Hospital Association considers a dog senior in roughly the last quarter of its expected lifespan, which arrives earlier for larger breeds.

Give MD1 once a day, based on weight: 0.85 g for 0–20 lb, 1.7 g for 21–45 lb, 2.55 g for 46–75 lb, 3.4 g for 76–100 lb, and 4.25 g for 101 lb and up. Use a measuring teaspoon (0.85 g is just over ¼ teaspoon) and mix it into food. Start at half the amount for the first 7–10 days.

MD1 is formulated for cats as well as dogs: one blend, dosed by weight. Cats use the Cat/Toy size (0–20 lb), at 0.85 g a day. It includes taurine, an amino acid cats must get from their diet. MD1 contains milk, beef and shellfish ingredients, so check with your vet first if your cat has a food allergy, a health condition or takes medication.

Every batch of MD1 is tested by Eurofins, an independent lab, for heavy metals (lead, mercury, arsenic and cadmium, tested under ISO/IEC 17025 accreditation), glyphosate, and microbes including Salmonella, E. coli, coliforms, mold and total plate count. The manufacturer's certificate of analysis also screens for Staph aureus and the pesticide acephate. The lab report is published on our Quality Standards page, so you can read the results yourself.

MD1 contains milk (bovine colostrum), beef (bone broth and bovine chondroitin) and shellfish (green-lipped mussel, plus glucosamine from crustacean shell). It's made without wheat, soy, eggs or peanuts. If your pet has a known food allergy or sensitivity, check with your veterinarian before starting MD1.

Some owners notice changes in energy, coat, digestion or mobility within a few weeks, but every pet is different. MD1 is designed for long-term daily support, so it works best given consistently over months rather than days. If you miss a day, simply carry on the next. Your first order is also covered by our 30-day guarantee.

Your first order of MD1 has a 30-day satisfaction guarantee, opened or not. If you're not happy, email hello@matterdays.md within 30 days of delivery for a full refund on that first order. The guarantee applies once per customer. After that, subscriptions can be skipped, paused or cancelled at any time.

No. Shipping is free on every US order, including single pouches, your first $29 pouch and subscriptions. Matterdays currently ships within the United States only. Orders are processed in 1–3 business days and typically arrive 3–7 business days after they ship, with tracking sent by email.

Subscription pricing depends on your pet's size. Cats and toy dogs are $19.50/month ($91 every 140 days). Dogs are $39/month for small, $49 for medium, $59 for large and $69 for XL, billed every 70 days. Your first subscription includes a free canister and free shipping, and you can skip, pause or cancel anytime.

Yes. New customers can get their first pouch of MD1 for $29 instead of $49, with free US shipping. Sign up for our emails to get the code. It's limited to one per customer and applies to a one-time pouch, not to subscriptions, which have their own size-based pricing.