I want to call this an impulse buy, but the more I think about it I realize it wasn't. I'd seen this stuff mentioned on a few lifestyle/healthy living blogs and was curious about it for a few reason. First, I have very weak nails. The nails on my big toes in particular tend to rip diagonally at the sides and have given me painful ingrown toenails on both sides of both toes. Second, my hair tends to fall out rapidly and grow slowly. (And yes, I have had a thyroid test--I'm borderline). Thirdly, I'm on the heavier side and it's been hell on my mid-30s joints. Fourth, I'm starting to get fine lines on my face and it's freaking me out. Fifth, I've had ibs for about 20 years and it sucks. So, I bought this product for reasons both vain and health-related. I'm only about halfway through my first canister, but I'm definitely noticing some improvements. For the record, I also take 10,000 mcg of Biotin daily. I don't know about my toenails yet, because they're very short, but my fingernails are definitely stronger. They used to bend dramatically when I put pressure on them, but now they stand strong and resist. I'm noticing a lot less shedding and my hair seems to have picked up its growing speed if only just a little. No real ~improvement in my skin yet, but that was the least of my worries. As far as my joints go, I'm able to squat and bend without hearing the musical sounds of a bowl of rice crispsies in my knees and ankles. Bathroom time has become a lot less urgent and painful. I'm going to keep taking it. The product claims to be both cold and hot soluble, and I mostly agree. I'd say it's more COOL and hot soluble, though. If I put it in something very cold, fresh from the fridge, it tends to clump up. If I leave the drink out on the counter for 5ish minutes first, it mixes much more cleanly. It also responds well to an immersion blender, so that's an option if you're impatient. I mixed it with milk once and that was the only time I felt I could taste it in a bad way. Usually I mix it with coffee (either hot or cold) or juice (citrus!) and as long as the liquid isn't too cold it mixes up well. I've started with just the 2tbsp in the morning to avoid a gastrointestinal reaction, but I'll probably add the second evening dose in soon