Adequate Intake (AI)

A reference dietary intake value used when a Recommended Dietary Allowance (RDA) cannot be established due to insufficient evidence for the average nutrient requirement. The AI is based on observed or experimentally determined intake levels in healthy populations. Used by NIH for nutrients such as biotin (30 mcg/day for adults) and choline (550 mg/day for adult men). EFSA uses similar concepts under "Adequate Intake" in its DRV framework.