I ate skyr for the first time ever yesterday. It's an icelandic cultured dairy product, similar to strained yoghurt, that contains high amounts of various strains of beneficial bacteria. It has zero fat, very low carbs and high protein content. You can find a more detailed description here: http://en.wikipedia.org/wiki/Skyr Anyways, I wasn't expecting anything to happen, I was just eating a vanilla flavored sugar-free container of skyr as a treat and to get some extra protein since I had a heavy workout that day. But within 15-20 minutes of consuming it, I got a sudden spike in libido that took me totally by surprise.. I started feeling a sexual hunger that came out of nowhere. I also felt my digestion cranking into motion and indeed had a bowel movement shortly afterwards (like my body was detoxing or something), and felt my entire body warming up. I've been feeling this uncomfortable sensation of constant low-grade nausea combined with shivering and having a hard time staying warm for a long time now. Granted, we've had a cold spell with temperatures down to -21C / -6f or even lower at night, but it feels more like some sort of internal thing than just a reaction to the outside temperature. My thyroid labs look good on paper and my body temps are normally ~37C even when this 'shivering' happens. But when I ate the skyr, the shivering stopped and my entire body warmed up. I still feel kind of funky in my stomach, but right now it feels more like there's a war going on down there, and the good guys are finally packing some heat! I thought this might've been just a fluke, but I repeated the skyr test today and sure enough, the exact same thing happened: libido shot up, I had a bowel movement and felt my entire body warming up. I can only guess that my gut is out of whack and the probiotics contained in the skyr helped nudge things in the right direction. It's odd, though, because I haven't really benefited from most probiotic strains that I've tried so far, with maybe one exception, and the manufacturer discontinued that product some years back. Funny how big an impact the health of your gut can have on every aspect of your well-being, even your libido!