I just found out, though it may not be news to you all, but for those who use individual pack Horizon's organic low fat chocolate milk, it now contains 'algal oil'. This must be algae-derived? I actually didn't even realize this until I'd already bought a large case, then noticed when I was home that the box looked a little different. A good reminder about always checking ingredients even for products that I buy regularly!
DS didn't have a problem with it. Carrageenan is also derived from algae.