I'm a BT user, and I also take supplements. 5mg Biotin, Multi, B-Complex, and NAC. I started the supplements and my BT around the same time, it's been about a month. I've been on the supplements for maybe a week longer than I have been using the BT, but it's too soon for me to have really seen tangible growth results from the supp's. For the first three weeks using BT consistantly my hair was in braids and I already had about .5 inch of new growth with my braids being about a month old. After 2 weeks using BT, there was another average .5 inch of growth, I say average because I seemed to get a little more in some places, and a little less in some places. Overall though, I acheived more growth than expected even though I failed on my 6 month C&G challenge. I didn't even have my braids in a full 2 months, and when I went back to my hairdresser to touch-up, (I was also 13 weeks post) she was surprised at how much it grew in that little time because I was still going to her regularly up until I got the braids. Now with my hair out, I've used it a little less, but I've used it twice in the last week and I'm going to start doing it regularly again regardless, just using a little at a time because I'd really like to keep seeing the same results. It made me imagine if I did go the distance with my C&G plan after 6 months the growth difference would have been sooo dramatic. But I missed my hair, and I am glad to have it out. Plus since I just had a touch-up, I love that I can really monitor the NG and how it all comes in.