ClearSight Compass Guide
Sources & Evidence Standards
We prioritize primary sources for medical and product facts and identify manufacturer statements as manufacturer claims.
Primary health source
National Eye Institute — AREDS/AREDS2: formula, study populations, and clinical-trial context.
Product source
Zenith Labs — Vision 20 product page: current manufacturer positioning, supply options, shipping and guarantee statements.
Return policy
Zenith Labs — Return Policy: current published guarantee mechanics.
Editorial rule
A claim about an ingredient is not automatically treated as proof about a finished branded formula. Disease-specific claims require appropriately matched evidence.