Menstrual Blood as fertilizer?

[rhizome]

Plants already have an estrogen-like hormone in them,

I'm gonna assume yer referring to phytoestrogens, which are substances that have estrogenic effects in mammals- not in plants. The meaning of estrogenic, in this context, is that these substances have effects similar to that of the estrogens in the regulation of cholesteral level and post-menopausal bone density. There is no phytoestrogenic effect upon mammal reproduction.
These are almost universally flavinoids, not steroid hormones like, say, any of the estrogens. They are not interchangeable. What you are saying is that because a steak knife can be used as a phillips screwdriver, a phillips screwdriver can be used as a steak knife.

it is a hormone that encourages growth and the reproductive cycle.

No, flavinoids are primarily found as pigments and as components of a plant's immune system. They are not hormones. They have no signifigant effect on growth rate or pheno. Flavinoid levels are regulated by plant metabolism, not vice versa.

By increases the hormone levels it can increase growth...

Once again, not hormones. No increase in growth rate. See above.

Do a search on the forums, people use birth control pills in their hydroponics for the same reason.

Not if they know what they're doing. I thought that this myth dissappeared back around 1974

I am not sure what kind of scientific evidence there is out there, but plenty of people says they noticed a difference.

There's none. Lots of scientific evidence to the contrary,though.

Plenty of people voted for W. Did'nt make it a good idea. They did it for the same reason,too...

My suggestion would be to try it yourself and find out...

~Raelum

Kinda implies that you have'nt. Please don't state fairy tales as fact.

I don't mean to pick on ya, I just don't want this place to turn into an echo-chamber of misinformation