Almost all of the research I have found on vitamin C has been positive and in my own experience it has really helped alleviate my allergies and chronic colds.
However, I found a study that was a little disturbing showing that guinea pigs put on a high vitamin C diet comparable to humans resulted in "more cartilage damage and had more bony spurs form in their knee joints than did the medium- and low-dose groups" and it also states "showed a significant worsening of osteoarthritis with increasing levels of vitamin C"
Here is the link: http://www.dukehealth.org/HealthPortals/orthopedic/news/7640
First, is there any rebuttal or contradictory evidence to this study?
Second, what can be done to prevent the cartilage & bony spurs of a high-dose vitamin regimen? (I currently take about 7g per day)
I am really interested given that I intent to qualify for the Olympic Marathon Standard this year or next and Vitamin C has been very beneficial for the short time I have been using it in a high dose regimen.
Thanks