Vyvanse is designed to last 10 to 14 hours. If it wears off early, the issue is usually metabolic.

Vyvanse is a prodrug (lisdexamfetamine) that your body converts into dextroamphetamine. Its active duration depends on your biology, hydration, and diet.

The 30-Gram Morning Protein Rule

Stimulants release dopamine. If your body lacks the raw amino acids to create neurotransmitters, the medication is less effective. Eating 30 grams of protein alongside your morning dose provides the structural foundation for sustained dopamine production.

Avoid Vitamin C Early On

Vyvanse's excretion rate is tied to urinary pH. If your system is acidic, your kidneys excrete amphetamines faster. Avoiding Vitamin C, citric acid, and highly acidic drinks in the morning ensures the medication stays in your bloodstream for its intended duration.

Hydration and Electrolytes

Amphetamines are diuretics that deplete water, sodium, potassium, and magnesium. Dehydration and electrolyte depletion often masquerade as a "Vyvanse crash." Drink water with an electrolyte mix throughout the day to keep your cellular energy stable.

L-Tyrosine for the Comedown

Taking L-Tyrosine 1 to 2 hours before your typical crash window gives your brain the dopamine precursors it needs to soften the landing and extend functional focus.

B-Vitamins for Metabolism

Your brain requires B-Vitamins to synthesize dopamine and norepinephrine. A methylated B-complex in the morning supports this metabolic process.