Yes, pineapple juice contains an enzyme called bromelain, which can help tenderize chicken and other meats. Bromelain works by breaking down proteins, which can help to tenderize tougher cuts of meat and make them more tender and juicy. However, it's essential to use pineapple juice in moderation and not marinate the chicken for too long, as prolonged exposure to bromelain can also lead to mushy or overly soft meat. Typically, marinating chicken in pineapple juice for 30 minutes to 2 hours should provide tenderizing benefits without compromising the texture of the chicken.