I purchased from the BestHCGStore and got it within 3 days. It was rx hCG mixed with B12 and I tested it for potency twice during my 2nd round and it was fine both times. I bought the whole kit because I wanted all their information and it comes with a 1ml dosing syringe and a dropper bottle so you can do it either way. I find it easier with the dosing syringe. If you purchase your own to mix, it is the same for shots as sublingual but you must use twice as much for sublingual to get the same effect. I am going to do the 500 iu this next round to see if Dr. Belluscio's theory of losing more belly/navel fat is true, so I ordered 10,000 iu vials to last 10 days at a time.