Lindsey and Brendan Weak believe that healthcare shouldn’t begin when illness strikes. They’ve turned that philosophy into Arizona’s first Next Health, a Glendale clinic focused on health optimization, longevity and preventative care. The couple calls its approach Medicine 4.0, which blends preventative, functional, lifestyle and longevity medicine under one roof. The goal is to track patients’ progress over the course of a long-term partnership, she said.

“Quarterly testing lets us see patterns,” he said. “We can guide people along their wellness journey — whether they’re exhausted from everyday life or, like us, want to be as healthy as possible for our young kids.”

Weak said Next Health strives to offer the time and personalization patients rarely get in traditional care.

“People are tired of getting 10 minutes with a doctor and being told, ‘Bloodwork looks good, see you next year,’” he said.

The Glendale location at 23423 N. 67th Ave. offers services like cryotherapy, red‑light therapy, infrared sauna, a hyperbaric oxygen chamber, precision IV therapy, and therapeutic plasma exchange.

“We literally take out your plasma, throw it in the trash, and give you brand-new, clean plasma,” said Lindsey, a nurse practitioner.

Most clients begin with IV therapy for hydration or targeted vitamins for stress, brain health, or immune support, she said. While there, they discover the clinic’s trademark service: biomarker testing.

Next Health’s baseline panel includes more than 70 biomarkers, spanning cardiovascular risk, hormone health and inflammation markers. From there, patients can opt into gut microbiome testing, food sensitivity panels, and genetic screenings for BRCA and Alzheimer’s risk.

“What biomarkers don’t we do?” joked Brendan, Lindsey’s husband and business partner.

The clinic’s Medicine 4.0 membership costs $99 a month for free quarterly testing, specialty panels, and one‑on‑one access to the clinic’s nurse practitioner.

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Next Health was founded by Dr. Darshan Shah, a board‑certified surgeon whose own health scare — routine bloodwork suggesting he might not live to see his son graduate high school — pushed him into the world of preventative medicine. Shah retrained himself, built a protocol that reversed his trajectory, and eventually founded Next Health to centralize the services that changed his life.

He now leads R&D for the brand and hosts the EXTEND Podcast, where he shares evidence‑based longevity insights.

Weak said that high‑caliber medical oversight is a defining feature of the franchise.

“Everything we offer is science‑backed, medically vetted, and delivered with clinical protocols,” she said. “That’s what sets us apart from other wellness clinics you might see throughout the Valley.”

Weak grew up on the West Valley side of town, and the demographics made sense: a growing population of “healthy agers” eager to take control of their long‑term wellbeing. “It felt like a natural place to start,” she said.

Peoria is the first Arizona location, but not the last. A second Next Health is slated to open in Paradise Valley in January 2027, with more expansion planned.

For now, Weak and her team are focused on introducing the community to a new kind of healthcare — one built around longevity, personalization, and prevention.

“Healthcare shouldn’t begin when you’re sick.”