every time I started getting moody after DD2 was born, DH would ask me if I'd eaten any placenta that day
I'll say it again, and again if I have to.
After my first was born, I had pretty bad depression and trauma and my milk didn't come in for *six* days! Yeah, that's mostly because of the nature of her birth, but if eating the placenta might mean that wouldn't happen again after my second DD was born, it wouldn't matter to me how gross I thought it was, I was going to give it a try. (It wasn't gross at all though, not near as bad as brussel sprouts IMO)
FWIW, my milk came in on day two and I never had anything remotely resembling ppd. I only had red lochia for one or two days, too. that may or may not be due to eating the placenta, but I think it really helped me in so many ways. Every time I ate a little of it, I immediately felt energized, more healthy, clear-headed, and better able to handle being a mom to a new baby. That in contrast to feeling totally overwhelmed and unable to cope after DD1 was born.