how much caffeine in soft drinks
Smaller Amounts. Soft drinks containing less than 40 mg of caffeine per 12-oz. serving include Coca-Cola and Coca-Cola Zero, which both contain 35 mg of caffeine, according to the Mayo Clinic. Diet Pepsi and Pepsi contain between 36 and 38 mg of caffeine per serving.Pepsi Wild Cherry contains 38 mg.maller Amounts. Soft drinks containing less than 40 mg of caffeine per 12-oz. serving include Coca-Cola and Coca-Cola Zero, which both contain 35 mg of caffeine, according to the Mayo Clinic. Diet Pepsi and Pepsi contain between 36 and 38 mg of caffeine per serving. Pepsi Wild Cherry contains 38 mg.