This stuff is an absolute life saver! In just one use my over processed hair felt so much healthier! It does smell a little weird but it's not overbearing and your hair won't smell like it. I believe the placenta comes from either a cow or sheep so it's definitely not human. I got mine at Sally's in the 5 Oz bottle and plan to buy more when I run out. I hope they never discontinue this because I can't live without it. Seriously, I dye my hair a lot so it needs this. Lol. Also, the hask henna n placenta mask within this line is awesome and I highly recommend buying both if your hair is at its wits end.