Inclusion Criteria:  Pre-frail (score of 1 or 2) or frail (score of 3-5) ≥ 60 years old Receiving elective unilateral total hip or knee replacement Waiting time for surgery is estimated to be between 4 to 15 months  Exclusion Criteria:  Renal disorder A neuromuscular disorder Active cancer Inflammatory arthritis Unable to speak or understand English and has no caregiver for translation Participating in another trial that involves protein supplementation Participating in an exercise program