A clinical trial in a defined patient group does not mean every supplement containing one or more ingredients has the same benefit. We identify the population, tested formula and outcome before drawing conclusions.
Age-related macular degeneration (AMD)
- NEI — About AREDS and AREDS2: trial design and findings about progression risk in specific patients, not vision restoration.
- NEI — AREDS/AREDS2 FAQs: studied formula and guidance about use, limitations and smoking history.
Safety and medical claims
- NIH Office of Dietary Supplements — Zinc: upper intake levels, interactions and high-dose considerations.
- FDA — 2024 SightCare advisory letter: describes disease-treatment marketing concerns regarding historical sites including this domain. The historical promotional claims are not endorsed here.
What we have not done
We have not conducted clinical trials, independent laboratory testing, or hands-on comparison of commercial supplement batches. We do not cite unnamed medical reviewers or create fabricated patient experiences. Manufacturer label data is identified as manufacturer-provided rather than independent clinical evidence.
See our editorial standards, current label-based formula comparison and medical disclaimer. Individual articles include their topic-specific sources.
Research library updated November 8, 2026. Source links should be checked periodically for changes.