When vit d became all the rage a few years ago I started taking 10,000 iu per day because that's what the researchers in a documentary I saw on it were taking. My doc was a little leery about such a high dose until I told her about the researchers (they weren't telling patients to take that much but were taking 10,000 themselves) and told her I had more energy, for sure, and maybe less pain. I only took it in the winter as I live in central Alberta where our winters are long and dark, and don't take it in the summer. I didn't take it last winter as I spent it in Mexico. I try to spend a lot of time outside in the summet, and if it's hot enough, the sun/heat can melt away some of my pain. I thought my doc said vit d3 could be toxic at higher doses, but I don't know at what dose. I'm very excited about trying this protocol. Will do some more research and talk to my doc, and hopefully give it a go. Thank goodness vitd3 is so cheap!! Thanks for posting!