Last reviewed 2026-04-22 · How we verify

Placebo (cornstarch)

Placebo (cornstarch) has no active pharmacological mechanism and produces therapeutic effects solely through the placebo effect.

Placebo (cornstarch) has no active pharmacological mechanism and produces therapeutic effects solely through the placebo effect. Used for Clinical trial control / research use only.

At a glance

Mechanism of action

Cornstarch is a biologically inert substance used as a control in clinical trials and research settings. It exerts no direct molecular or physiological action on disease pathways. Any observed clinical benefit derives from patient expectation, the therapeutic context, and psychobiological mechanisms rather than from the substance itself.

Approved indications

• Clinical trial control / research use only

Common side effects

• Adverse events attributable to placebo effect or underlying condition

Key clinical trials

• Effects of Probiotics on Respiratory Tract Infections in Children: A Randomized, Placebo-Controlled Interventional Study (PHASE2)
• IRELAnD: Investigating the Role of Early Low-dose Aspirin in Diabetes (PHASE3)
• Probiotic Treatment for Depression and Associated Mood Disorders in Parkinson's Disease (PHASE2)
• Food-Specific and Component IgE Threshold Levels That Predict Food Allergy in People With Elevated Total Serum IgE Levels and Atopic Dermatitis (PHASE2)
• Clemastine Fumarate in the Treatment of Neurodevelopmental Delays in Williams Syndrome (PHASE2)
• Caffeine Supplementation and Strength Endurance in Brazilian Jiu-jitsu Athletes (NA)
• L-serine and Strength Training in the Elderly (NA)
• Abscisic Acid Effects on Glucose Homeostasis and Insulin Sensitivity (PHASE2)

Primary sources

Every claim on this page is sourced from regulatory or scientific primary sources. See our editorial policy for full methodology.