I had excellent gains with Tymlos. Many seem to be taking Evenity these days: it is new and very potent. Others start with Forteo. You can read up or watch Ben Leder's video on You Tube on Combinations and Sequencing. The advice is to start with a bone builder (like the three I mentioned) and then "lock in" gains with a bisphosphonate like Reclast or Fosamax. Some use Prolia but it is hard to get off and the fracture risk goes up when it is stopped.