Hi! I've been using iHerb since 2011 and have tried a LOT of products. I live in outer metro Adelaide (about 45 mins out), and if I order on a Friday, I get my stuff that Tuesday! So I will tell you the truth about the codes: They are ALL THE SAME. Yep, they all offer the same discounts, and don't let anyone try to fool you otherwise. What happens is, you get $5 off, and then the person who referred you, gets $5 too. But they also get 5% of your orders for the next 12 months. When you make your 1st order, you'll get a code to share to get $5 too! So it's a great scheme! But it matters who's code you use in an ethical sense. For eg, I used my ex's code before I realised he was a bit dodgy, and then he benefited from the thousands I spent that first year! If you choose my code, you're benefitting a single Mum trying to work and study my way to something better for my children, and just like you, want to be happy and healthy! Thank you and Happy Shopping!