I've used several forums of DAA, and had no sides yet. However bare in mind we all react differently. It's always good to have a form of post cycle therapy (pct) or Aromatase inhibitor (AI) on hand. Pes Erase, and Formeron on two of the best selling and effective ones. If you get a chance try out PP's TCF-1 or Ahtletix Formula x. Both taste good and are not high on price. Orbitnutrition carries both of them. I used TCF-1 in a stack and got some nice increases in strength! Good luck!