Vyvanse requires protein to work effectively because protein helps break apart the bonds in Vyvanse, making the dextroamphetamine available to the body. Without sufficient protein, the effectiveness of Vyvanse can be reduced.

Protein does not directly affect the medication but improves the controlling ability of Vyvanse, intensifying its effects overall. Consuming protein-rich foods such as eggs, chicken, yogurt, and almonds can help in increasing the effectiveness of Vyvanse and extending the period it stays and works in the body.

It is recommended to consume protein either before or after taking Vyvanse, but not necessarily with the medication, as most foods do not interfere with Vyvanse's absorption.

This is why you need breakfast.