Efficacy of Zinc Supplementation on Botox Treated Forehead Rhytids

Inclusion Criteria: Any patient older than 18 years old who desires botulinum toxin injection to decrease forehead rhytids Exclusion Criteria: * Allergy to any components of zinc citrate or botulinum toxin * inflammation or infection at site of injection * patients using anticholineresterase or other agents interfering with neuromuscular transmission * patients with any medical condition that can affect frontalis function (Bell's palsy, Möbius syndrome, Hemifacial microsomia, CHARGE syndrome, stroke, etc) * patients with any prior trauma that could have potentially injured the frontalis muscle * patients dependent on intact facial movements and expressions for their livelihood (actors, singers, musicians, etc)