I already eat liver, marrow, kidneys and heart (and drink blood). Brain has simply not been available until now, so I look forward to trying that eventually along with tongue and testicles. I agree with you regarding the taste of the marrow, I actually think raw marrow is the best food I've ever tried, even better than anything I used to eat on standard cooked diet. Regarding liver, how much did you eat? I eat 100-200 grams a day and think it's great, although if I suddenly stop tolerating it, I will obviously stop. Thanks for the information regarding brain, I have a source which has some very good meat, close to the taste of wild game. Not quite, but I can't get any organs from wild game so it's not like I have much of a choice. Regarding blood, I find it invigorating, where as before the other grain-fed and grass-fed sources were different. Although I've never been able to get it from wild game, so I've no idea what that would be like. What happened with the stag testicles?
I'm also interested about the various glands and other parts. I know, for example, that by far the highest source of Iodine is in the thyroid gland. I'm sure other organs are all unique in the potential benefits they may offer.