Even before switching to alternatives, at the beginning when I was using 100% IP products, I never bought the IP supplements. I have the IP supplements sheet which I am attaching it in here for your info, and I follow what is recommanded to take and buy my supplements from Costco, Walmarts, GNC and local pharmacies.
Started IP 06-30-11 @250lbs - Started alternatives mid Oct. 2011 - Stopped on Christmas 2011 (biggest mistake of my life) Lost 50lbs by then. Gained back all the weight I lost + 15 more lbs after IVF in 2013.
Many re-starts failed miserably. I stopped IP as I wasn't sticking to the plan but always try to re-start.