Journal · Formulation · 6 min
Time-release actives: the case for less, applied slower.
The area under the curve is what determines the clinical effect. Peak concentration is what determines the sting.
The Biomedical Emporium® formulation desk
25 May 2026
When pharmacology talks about how a drug performs, the two numbers that matter most are peak concentration and area under the curve. Peak drives side effects. Area under the curve drives efficacy. The interesting formulation trick is to lower peak while holding area constant.
Time-release does exactly that. A retinoid delivered raw peaks in the first hour and drops off. A retinoid delivered through an encapsulated slow-release matrix peaks lower but stays present across the whole night. Same total dose. Different curve.
Read next
The three-week retinisation plan.
A one-page schedule that gets most skin to nightly retinoid application with almost no drama.