public void SetSupplements(IEnumerable<Supplement> supplements)
 {
     var supplementRepository = new SupplementRepository();
     foreach (var supplement in supplements)
     {
         supplementRepository.SetSupplement(supplement);
     }
 }
 public IEnumerable<Supplement> GetSupplements()
 {
     var supplementRepository = new SupplementRepository();
     return supplementRepository.GetSupplements();
 }