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Prophylactic
Substance or regimen that helps prevent disease or illness.
Preventive intervention, such as nutrient supplementation, immunization, or screening, intended to reduce the risk or severity of disease.
How one textbook covers it
Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Preventive intervention, such as nutrient supplementation, immunization, or screening, intended to reduce the risk or severity of disease.