The study team is conducting a study to see if Magnesium-L-Threonate (MgT) can help improve how well participants sleep and reduce pain after total joint replacement surgery

Inclusion Criteria:

• Patients undergoing primary total knee or hip arthroplasty at the University of Miami Hospital
• Patients > 18 years of age
• Subjects must be capable of providing informed consent
• English or Spanish-speaking

Exclusion Criteria:

• Previous total joint arthroplasty at the surgical site
• History of sleeping disorders, including narcolepsy, sleep apnea, insomnia, parasomnias, and restless leg syndrome.
• History of Complex Regional Pain Syndrome in ipsilateral extremity
• History of demyelinating disorder or neurologic deficit in the affected extremity
• History of psychiatric disorders that could impact sleep, such as untreated depression, bipolar disorder, or schizophrenia.
• Participants taking medications known to cause significant sedation or insomnia.
• Pregnant or breastfeeding
• Being treated for a diagnosis other than primary osteoarthritis (e.g. pelvic/femur fracture)
• Patients with known substance use disorder within 6 months of surgery
• Liver Failure, via clinical diagnosis or international normalized ratio greater than 1.5 or Prothrombin time greater than 40
• Chronic Kidney Disease or glomerular filtration rate less than 30 mL/min