For elderberry syrup, the typical daily dosage for adults is 150 to 300 mg of elderberry extract, with many syrups containing about 100 mg per teaspoon. Therefore, 1.5 to 3 teaspoons are generally recommended. It's essential not to exceed these doses, especially for individuals with autoimmune conditions. Always check for standardized extracts to ensure potency, as advised by the American Herbal Products Association.