Are you referring to 15 grams at once ? Because that is a lot for anyone and would give you the wobbles with just about any strain . I have a high tolerance but even I have never taken that much at once . I think the largest dose I have taken is 12 grams , ever . The largest dose I generally take is about 8 grams and even that is rare . I usually dose at 6 to 7 grams and redose at about 4 grams every two to three hours depending on the day . I really dont have any favorite vendors anymore . Many of them have faded away . I spent a couple of years buying from only one vendor and they have closed down because of the proposed ban and not come back . During that time , most of the vendors I use to use have closed down . Motarks is a good one as is BuyKratom . I have had mmmspeciosa but it has been a couple of years since I have had anything from them . Speciosa Pro is also a good one but they are really expensive like on par with headshops expensive . But , if you ever get a chance , their Emerald Thai is one of the best strains I have ever had . My favorite strain is Green Malay and then Maeng Da . After that Red Thai . Whites do not do anything for me at all and I generally stay away from Red strains unless it is Thai or Maeng Da . So , mostly Green strains and any Maeng Da . But , I am going to make a run at trying more strains as I got stubborn and stuck to what I knew for a long time . Maybe something has changed for me so I am going to be ordering a whole bunch of different strains from different vendors next month .