What term is used in place of "recommended daily allowance" (RDA) when sufficient data are not available to establish RDA values for a specific nutrient?

The term that is used in place of 'recommended daily allowance" when sufficient data are not available to establish RDA values for a specific nutrient is called Adequate intake (AI)

Explanation:

This is used as a substitution of recommended daily allowance if sufficient evidence is not given to calculate the ERA.

Values are based on experiment where the value of mean nutrient is taken from a healthy group of people.

Foe example nutritional stages of normal growth, maintenance of normal circulating nutrient value or general health.

It is used to establish ERA when the information is inadequate.

It is an indication where more research is needed to determine the mean, distribution of requirement for a specific nutrient, degree of confidence etc.