Shred T3x And often they are enriched with creatine, extra amino acids, etc. for even better performance! How to take Weight Gainers Weight detectors can be taken at various times during the day. You can use them between meals or shake up post workout recovery. Keep in mind that the portions of these products are generally quite large, so you'll have to drink a big shock. You should also drink plenty of water while using these products. Weight Gainer Side Effects The ingredient profiles of these supplements may vary from product to product, and therefore side effects may also vary. That said, the most commonly reported side effects include swelling and / or stomach upset. If you find one of these side effects related to the stomach occurs, consider a partial dose instead of a full one.