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While EPDs disclose environmental life-cycle impacts, ingredient transparency focuses on what a product is made of and the associated hazards. Health Product Declarations (HPDs) and comparable programs (e.g., Declare labels, certain Cradle to Cradle certifications) inventory chemical ingredients to a defined threshold and screen them against authoritative hazard lists. This allows teams to compare alternatives, prefer inherently safer chemistries, and engage suppliers in reformulation where needed. Generic “non-toxic” claims lack rigor and are seldom verifiable. Labels and brochures provide limited or selective information and rarely include hazard assessments. By specifying HPDs/recognized ingredient reports in submittals, tracking categories in a matrix, and coordinating early with vendors, the team builds a defensible documentation set for MR credits while advancing healthier indoor environments—complementing IEQ low-emitting requirements and supporting market transformation toward transparent, safer products.