Ive reviewed several sites with the intent to buy supplements. There are many sites available. But, first and foremost, I want quality at a reasonable price. I find that with Lucky Vitamin (LV) and their site. Great selection with details on each item offered so you can SEE what the supplement provides to you. You have a picture of the info. on the container. You can READ it and see if it is what you want. There is your quality assurance. Then, the prices are good and get BETTER if you buy more. Dont need 3 bottles? Fine, get one at a good price, too! So, their delivery must be slow, since it is free (for orders $45+). No, LV beat Amazon by 4 days. I ordered from both on the same day. Ordered MORE from LV. LV arrived in 3 days. Amazon arrived in 7 days. Quality, price and service. A nice complement that compliments LV. Thank you.