A recent study found that people who had lower than average levels of Vitamin C in their blood were more likely to report neck pain and lower back pain. This was an observational study, in that they didn't give Vitamin C to people with pain and see and improvement, but found this association by asking questions about pain and comparing it to their blood work. While severe Vitamin C deficiency (scurvy) is rare in the US, vitamin C deficiency is more common than once thought, about one in 7 Americans are thought to have chronically low levels, and one in five may be too low at times. Foods that contain good amounts of Vitamin C are sweet peppers, hot peppers, oranges, cantaloupe, kiwi, cauliflower, broccoli, brussel sprouts, and leafy greens. This study was part of the NHANES, a large study done by the CDC on health and nutritional status of Americans, this study included about 4700 individuals. Useless info found on the web: On checking to make sure I wasn't missing new popular sources of vitamin C, I came across an article that suggested the spice saffron as a source. A teaspoon of saffron has 1% of your daily value of vitamin C, and "cheap" saffron costs $6 a gram, so at least $600 per day. I'm still shaking my head at why that was included, but found there were half a million google hits of people also mentioning saffron as a source of vitamin C.