The time a substance takes to make it into general circulation is:

A) distribution half-life
B) therapeutic half-life
C) elimination half-life
D) administration half-life

Therapeutic Half-life

The time required for the concentration of a drug in the body to decrease to half of its starting dose, which is crucial in determining the drug's dosage and scheduling.

Elimination Half-life

The time it takes for the concentration of a substance in the blood to be reduced by half, an important measure in pharmacokinetics.

Distribution Half-life

The time it takes for a drug or substance to reduce to half its initial quantity in the body due to distribution processes.