<How can it be junk science if it actually happened?>

What they're saying is "junk" is the "pig bladder pixie dust mixture," not that his finger grew back. He only had about half an inch of flesh gone, no missing bone. They allege that it could have grown back without the pixie dust "treatment."

I don't know who is right about the collagen mixture, if it works or not. I do know that on Christmas Eve when I was young I ran after my sisters who went to shut the garage door, and I got my right pointer finger stuck in the door, badly damaging it. Went to the emergency room, they treated it, and weeks later, I grew back a nail, and a few weeks after that I grew back a nail. It's not like I was missing my finger-tip, but it was still quite a damaging injury, yet I have an even solider nail on that finger than any of my others because of that.

These days, when a bone breaks, often a substance is used that helps the bone heal quicker. So there is no reason that this *has* to be junk science. Pigs are a lot like humans, their skin is very similar to ours. It's said that eating pig flesh is the closest thing to eating human flesh, that those who like pig flesh enjoy the taste of human flesh.

<Hey, one article cites a claim that it's junk science, therefore, it must be true, right?>

No, not necessarily. But the same goes in reverse. Just because it's said that it works doesn't mean it does. It could just be nature working its healing course, "pixie dust," or not.