I’m a hardcore collagen user and I’ve been using the unflavored collagen in my coffee for a few weeks. At first, I couldn’t figure out what was turning me OFF about it whenever I mixed it into my coffee 😅 There is Apple Cider Vinegar (ACV) extract in it! Which I believe is the smell that I was getting? It’s not *bad*, but it’s indeed different. It does not have a taste and the smell goes away after you mix it up, so it’s not a huge issue for me in regards to finishing up the container! I’m not sure if it’s a regular experience with the product, unflavored variation, etc.