Dr. Ronald Castell, MD
Men's Health Physician
Twenty years in primary and urological care. Dr. Castell reviews the formula for plausibility, contraindications and the line between supplement support and medical claims.
Our Expert Panel
Vivalis is reviewed by independent advisors across men's health, nutrition and botanical science.
No supplement should be built in a vacuum. Before any formula change reaches a production batch, it passes through our advisory panel, three independent professionals who pressure-test the reasoning, the doses and the safety profile. They are compensated for their time and review work, and they do not earn commission on sales.
Priya Nandi, RDN
Registered Dietitian Nutritionist
Specializes in micronutrient timing for active adults. Priya advises on dosing, bioavailability and how Vivalis fits into a balanced daily diet.
Gareth Holloway, MSc
Botanical Research Lead
Focused on standardized plant extracts and quality sourcing. Gareth evaluates each botanical's standardization and the strength of its traditional and modern evidence.
How we review the formula
- Evidence scan. Each ingredient is assessed against current literature and traditional use for the pillar it is meant to support.
- Dose and safety check. Amounts are set to printable, sensible levels and reviewed for interactions and tolerability.
- Claims review. Every line of customer-facing copy is checked so language stays in the realm of support, never disease treatment.
- Batch sign-off. Laboratory results for each lot are reviewed before that batch is released and documented on the verification page.
The names and credentials here are illustrative of the review roles involved and are part of our editorial presentation. Learn more about how we test or read how the formula works.