The Science
We test for everything
you can't see on a label.
Northwell was founded in 2024 by two physicians who spent fifteen years recommending supplements to patients and being disappointed by the gap between what the research showed and what they could find on a shelf.
Our standards
Three things we won't compromise.
Active forms only
When a vitamin has a biologically active form (B12 → methylcobalamin, folate → L-5-MTHF, B6 → P-5-P), we use it. Even when the "inactive" form costs 70% less to source.
Third-party tested · every batch
Every batch is tested by an independent ISO/IEC 17025-accredited lab — three of them, rotated to prevent any one lab from being a point of failure. Tests cover 4,800+ contaminants and pathogens.
No proprietary blends
Every milligram is disclosed. If a formulation needs to hide its dose ratios to look impressive, that's a tell that the doses are below the studied therapeutic level.
Founders
Practicing physicians, not influencers.
Dr. Lena Chen, MD
Co-founder · Chief Medical Officer
Internal medicine, Stanford (BS Biochem, 2006; MD, 2010). Eleven years in a primary-care practice in Boulder. Board certifications: ABIM Internal Medicine, ABLM Lifestyle Medicine.
Areas of focus: cardiometabolic, women's health
Dr. Marcus Thorne, MD
Co-founder · Head of Formulation
Endocrinology, Columbia (MD, 2008; fellowship 2014). Twelve years on the academic faculty at Mt. Sinai before going into private practice. Author of 19 peer-reviewed articles.
Areas of focus: thyroid, sleep architecture
The facility
Manufactured in Boulder, Colorado.
| Location | 3320 Walnut St, Boulder, CO 80301 |
| Facility certifications | NSF cGMP · NSF Certified for Sport · FDA-registered |
| Testing labs | Eurofins · Covance · Alkemist Labs (rotated) |
| Tests per batch | Heavy metals (Pb, As, Cd, Hg), microbials, pesticides (>500), residual solvents, identity, potency |
| Contaminants screened | 4,800+ across the panel |
| CoA availability | 100% public · linked from every PDP |
Begin
Start with the foundations.
Most people need three: a multivitamin, magnesium, and (depending on diet) omega-3. We start there.
Shop foundations