Sperm: nutricional/cosmetic value?

I've heard that cum is very good for your health to swallow, that it is high in protein and loaded with vitamins. I've also heard that it's good for your skin. Not that I want to swallow my bf's load everyday (ick!) or rub it all over my body either. lol just curious if it's fact or fiction. Also if it is good for you how much of it is needed for any beneficial therapy?