Hi Mbeth; I haven't heard of lactoferrin, but if you want to "do something in addition to strontium", have you considered vitamin K2? That's what I'm doing. Apparently it doesn't produce as great a result as strontium, but it can increase BMD by 1% a year. You do have to be careful if you have a tendency towards blood clotting though. I take one every second day with plenty of water. This past couple of weeks my torn knee cartilage has been really painful though (because of working out too hard to help...

osteoporosis

), so since I'm pumping the aspirins I figure I can take the K daily.
You mentioned that you want to take action because of osteopenia (and you did all the right things-me too, and I have a vertebrae of -3.4). Mbeth, I'm not trying to trivialize osteopenia, but did you know that this so-called "disease" was coined by the pharmaceutical industry and didn't even exist back in the 70's? Because of this, hundreds of women (and yeah, some men too) have been terrified into thinking that they must begin taking drugs immediately and for life. This is exactly what Big Pharma wanted

.
I guess what I'm trying to say is: keep doing all the positive things you're doing (exercise, healthy diet, vitamin supplementation) but don't buy into the marketing of fear and feel that you're abnormal if you don't have the T-score of a 20 yr old. My life has been consumed by fear over this for the past 7 years, and I hate to see others go thru it too.